at91: Status of NAND flash access
Bryan Evenson
bevenson at melinkcorp.com
Fri Dec 7 09:47:52 EST 2012
Josh,
Answers below.
Regards,
Bryan
> -----Original Message-----
> From: Josh Wu [mailto:josh.wu at atmel.com]
> Sent: Friday, December 07, 2012 4:31 AM
> To: Bryan Evenson
> Cc: linux-arm-kernel at lists.infradead.org
> Subject: Re: at91: Status of NAND flash access
>
> Hi, Bryan
>
> Thanks for doing such test. see my comment below:
>
> On 12/6/2012 9:20 PM, Bryan Evenson wrote:
> >> -----Original Message-----
> >> From: Josh Wu [mailto:josh.wu at atmel.com]
> >> Sent: Thursday, December 06, 2012 5:30 AM
> >> To: Bryan Evenson
> >> Cc: linux-arm-kernel at lists.infradead.org
> >> Subject: Re: at91: Status of NAND flash access
> >>
> >> On 12/6/2012 11:13 AM, Bryan Evenson wrote:
> >>> Josh,
> >>>
> >>> I spoke too soon. I was able to read and use the filesystem from
> >> NAND
> >>> flash with the patch you provided when I applied it to the Atmel
> 3.4
> >>> kernel fork over at https://github.com/linux4sam/linux-at91/
> (master
> >> branch).
> >>> When I applied the same patch to the recent mainline kernel (3.7-
> >> rc8),
> >>> it's still having problems accessing flash. The boot log shows
> that
> >>> it is setting up for PMECC correctly, but it has errors when it
> >>> tries to read from the filesystem.
> >> It is strange. The 3.4 kernel from at91 github just have a few
> >> changes.
> >> so rationally it behavior the same at PMECC function. From your log,
> >> the
> >> 3.7-rc8 kernel says the PMECC found uncorrectable errors.
> >>
> >> Can you try to dump or read from the u-boot? to see whether u-boot
> >> can recognize the same nand page that "too many errors" happened in
> kernel?
> >> I will do some test to see whether the 3.7-rc8 can work in my side
> or
> >> not.
> > U-Boot> nand read 0x22000000 0x800000 0x1D00000
> >
> > NAND read: device 0 offset 0x800000, size 0x1d00000
> > PMECC: Too many errors
> > NAND read from offset 800000 failed -5
> > 0 bytes read: ERROR
> >
> > So u-boot has the same issue.
> seems some page are really damaged or the error correction code has
> bugs.
>
> > However, changing the kernel to the linux-at91 forked kernel produced
> > different results. That kernel noted the PMECC errors but was still
> > able to load the filesystem.
> I don't find the 3.4 kernel noted the PMECC errors in your attached
> log.
>
> > My boot output from the successful
> > filesystem load is below. Is the 3.4 kernel performing corrections
> > that the mainline is not,
>
> no. I don't think so. The PMECC part of patch is the almost same. Only
> some minor change are made in v3.4 for back port.
>
> > or is it just ignoring errors that it should not be ignoring?
>
> This is more possible. I means maybe 3.4 kernel doesn't check some area
> 3.7-rc8 checked.
>
> >
> > I'm hesitant to make any filesystem changes on this board because I
> > know test cases like this where it works one way but not the other
> are
> > kind of rare. Let me know if you have similar results on your end.
> I tested in two version of kernel my side:
> 1. https://github.com/linux4sam/linux-at91/commits/at91-3.4-
> trunk_merge
> fcf88e036fce6c382510874b1dc90e9b49608ccf (Merge branch
> 'at91-3.4-trunk/v3.4.x_gmac' into at91-3.4-trunk_merge)
> 2. v3.7-rc8 plus the patch I sent to you to enable PMECC in dtsi.
>
> I cannot reproduce the situation you met In my side. Both can boot the
> ubi rootfs system correctly.
>
> So the your case is rare.
>
> To find out why those two kernel work differently, could you help me to
> do:
>
> 1. use u-boot "nand read" to do some bisect in nand flash offset,
> which we can narrow down the page that has uncorrectable pmecc errors.
>
After trial and error, I got down to this:
nand read 0x22000000 0x865000 0x100
NAND read: device 0 offset 0x865000, size 0x100
PMECC: Too many errors
NAND read from offset 865000 failed -5
0 bytes read: ERROR
> 2. use u-boot "nand dump offset" to show the raw data of that page.
> please send me the log. I can generate the same page from your log. and
> check whether it can be corrected in my side.
U-Boot> nand dump 0x865000
Page 00865000 dump:
31 18 10 06 52 bd c6 c9 5d 44 02 00 00 00 00 00
00 02 00 00 07 00 00 00 04 15 00 00 00 00 00 00
05 00 00 00 00 00 00 00 03 00 00 00 04 00 00 00
0f 01 00 00 c8 5a 00 00 58 00 00 00 d8 00 00 00
0f 01 00 00 00 60 00 00 30 3b 0b 00 00 00 00 00
00 18 7a 0c 00 00 00 00 08 2f 84 00 00 00 00 00
c8 ad b6 01 00 00 00 00 c0 5a 02 00 00 00 00 00
08 06 a3 00 00 00 00 00 08 00 00 00 e2 28 00 00
08 00 00 00 00 30 00 00 08 00 00 00 00 28 00 00
00 00 00 00 00 00 00 00 67 01 00 00 6e 06 00 00
07 00 00 00 a8 07 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
31 18 10 06 ef de 0e ee 00 00 00 00 00 00 00 00
1c 00 00 00 05 00 00 00 e4 05 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
OOB:
ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff
ff ff ff ff 3f 00 02 00
>
> 3. in 3.4 kernel, use dd command to read that page, to see any
> uncorrectable pmecc error happen.
> if no error happens in 3.4, then it means it correct that
> v3.7-rc8 cannot. There mush be something different in 3.4 kernel pmecc
> between mainline.
> if error happens, that means 3.4 kernel skips those area but
> 3.7-rc8 does not. So I suspect it maybe caused by some code of UBI part
> changes.
root at at91sam9x5ek:~# dd if=/dev/mtd1 of=/var/log/dump.bin bs=1k count=1 skip=65
1+0 records in
1+0 records out
1024 bytes (1.0KB) copied, 0.001962 seconds, 509.7KB/s
If I understand dd correctly, that should be reading 1KB of data starting at
0x865000 (/dev/mtd1 starts at 0x800000, plus offset of 65 1KB blocks). If I
read the wrong block, let me know what the correct command line should be.
>
> Best Regards,
> Josh Wu
>
> >
> > -Bryan
> >
> > Uncompressing Linux... done, booting the kernel.
> > Booting Linux on physical CPU 0
> > Linux version 3.4.0 (xxxx at xxxx) (gcc version 4.5.3 20110311
> > (prerelease) (
> > GCC) ) #2 Wed Dec 5 15:36:29 EST 2012
> > CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=00053177
> > CPU: VIVT data cache, VIVT instruction cache
> > Machine: Atmel AT91SAM (Device Tree), model: Atmel AT91SAM9G25-EK
> > Memory policy: ECC disabled, Data cache writeback
> > AT91: Detected soc type: at91sam9x5
> > AT91: Detected soc subtype: at91sam9g25
> > AT91: sram at 0x300000 of 0x8000 mapped at 0xfef70000
> > Clocks: CPU 400 MHz, master 133 MHz, main 12.000 MHz
> > gpiochip_add: registered GPIOs 0 to 31 on device: pioA
> > gpiochip_add: registered GPIOs 32 to 63 on device: pioB
> > gpiochip_add: registered GPIOs 64 to 95 on device: pioC
> > gpiochip_add: registered GPIOs 96 to 127 on device: pioD Built 1
> > zonelists in Zone order, mobility grouping on. Total pages: 32512
> > Kernel command line: mem=128M console=ttyS0,115200
> > mtdparts=atmel_nand:8M(bootst
> > rap/uboot/kernel)ro,-(rootfs) root=/dev/mtdblock1 rw rootfstype=ubifs
> > ubi.mtd=1 root=ubi0:rootfs PID hash table entries: 512 (order: -1,
> > 2048 bytes) Dentry cache hash table entries: 16384 (order: 4, 65536
> > bytes) Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
> > Memory: 128MB = 128MB total
> > Memory: 119856k/119856k available, 11216k reserved, 0K highmem
> Virtual
> > kernel memory layout:
> > vector : 0xffff0000 - 0xffff1000 ( 4 kB)
> > fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)
> > vmalloc : 0xc8800000 - 0xff000000 ( 872 MB)
> > lowmem : 0xc0000000 - 0xc8000000 ( 128 MB)
> > modules : 0xbf000000 - 0xc0000000 ( 16 MB)
> > .text : 0xc0008000 - 0xc04650d4 (4469 kB)
> > .init : 0xc0466000 - 0xc048a000 ( 144 kB)
> > .data : 0xc048a000 - 0xc04c4420 ( 234 kB)
> > .bss : 0xc04c4444 - 0xc09c66e4 (5129 kB)
> > NR_IRQS:192
> > sched_clock: 32 bits at 100 Hz, resolution 10000000ns, wraps every
> > 4294967286ms
> > Console: colour dummy device 80x30
> > Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo
> > Molnar ... MAX_LOCKDEP_SUBCLASSES: 8
> > ... MAX_LOCK_DEPTH: 48
> > ... MAX_LOCKDEP_KEYS: 8191
> > ... CLASSHASH_SIZE: 4096
> > ... MAX_LOCKDEP_ENTRIES: 16384
> > ... MAX_LOCKDEP_CHAINS: 32768
> > ... CHAINHASH_SIZE: 16384
> > memory used by lock dependency info: 3695 kB
> > per task-struct memory footprint: 1152 bytes
> > ------------------------
> > | Locking API testsuite:
> > ---------------------------------------------------------------------
> -------
> > | spin |wlock |rlock |mutex | wsem
> | rsem |
> > ------------------------------------------------------------------
> --------
> > A-A deadlock: ok | ok | ok | ok | ok
> | ok |
> > A-B-B-A deadlock: ok | ok | ok | ok | ok
> | ok |
> > A-B-B-C-C-A deadlock: ok | ok | ok | ok | ok
> | ok |
> > A-B-C-A-B-C deadlock: ok | ok | ok | ok | ok
> | ok |
> > A-B-B-C-C-D-D-A deadlock: ok | ok | ok | ok | ok
> | ok |
> > A-B-C-D-B-D-D-A deadlock: ok | ok | ok | ok | ok
> | ok |
> > A-B-C-D-B-C-D-A deadlock: ok | ok | ok | ok | ok
> | ok |
> > double unlock: ok | ok | ok | ok | ok
> | ok |
> > initialize held: ok | ok | ok | ok | ok
> | ok |
> > bad unlock order: ok | ok | ok | ok | ok
> | ok |
> > ------------------------------------------------------------------
> --------
> > recursive read-lock: | ok |
> | ok |
> > recursive read-lock #2: | ok |
> | ok |
> > mixed read-write-lock: | ok |
> | ok |
> > mixed write-read-lock: | ok |
> | ok |
> > ------------------------------------------------------------------
> --------
> > hard-irqs-on + irq-safe-A/12: ok | ok | ok |
> > soft-irqs-on + irq-safe-A/12: ok | ok | ok |
> > hard-irqs-on + irq-safe-A/21: ok | ok | ok |
> > soft-irqs-on + irq-safe-A/21: ok | ok | ok |
> > sirq-safe-A => hirqs-on/12: ok | ok | ok |
> > sirq-safe-A => hirqs-on/21: ok | ok | ok |
> > hard-safe-A + irqs-on/12: ok | ok | ok |
> > soft-safe-A + irqs-on/12: ok | ok | ok |
> > hard-safe-A + irqs-on/21: ok | ok | ok |
> > soft-safe-A + irqs-on/21: ok | ok | ok |
> > hard-safe-A + unsafe-B #1/123: ok | ok | ok |
> > soft-safe-A + unsafe-B #1/123: ok | ok | ok |
> > hard-safe-A + unsafe-B #1/132: ok | ok | ok |
> > soft-safe-A + unsafe-B #1/132: ok | ok | ok |
> > hard-safe-A + unsafe-B #1/213: ok | ok | ok |
> > soft-safe-A + unsafe-B #1/213: ok | ok | ok |
> > hard-safe-A + unsafe-B #1/231: ok | ok | ok |
> > soft-safe-A + unsafe-B #1/231: ok | ok | ok |
> > hard-safe-A + unsafe-B #1/312: ok | ok | ok |
> > soft-safe-A + unsafe-B #1/312: ok | ok | ok |
> > hard-safe-A + unsafe-B #1/321: ok | ok | ok |
> > soft-safe-A + unsafe-B #1/321: ok | ok | ok |
> > hard-safe-A + unsafe-B #2/123: ok | ok | ok |
> > soft-safe-A + unsafe-B #2/123: ok | ok | ok |
> > hard-safe-A + unsafe-B #2/132: ok | ok | ok |
> > soft-safe-A + unsafe-B #2/132: ok | ok | ok |
> > hard-safe-A + unsafe-B #2/213: ok | ok | ok |
> > soft-safe-A + unsafe-B #2/213: ok | ok | ok |
> > hard-safe-A + unsafe-B #2/231: ok | ok | ok |
> > soft-safe-A + unsafe-B #2/231: ok | ok | ok |
> > hard-safe-A + unsafe-B #2/312: ok | ok | ok |
> > soft-safe-A + unsafe-B #2/312: ok | ok | ok |
> > hard-safe-A + unsafe-B #2/321: ok | ok | ok |
> > soft-safe-A + unsafe-B #2/321: ok | ok | ok |
> > hard-irq lock-inversion/123: ok | ok | ok |
> > soft-irq lock-inversion/123: ok | ok | ok |
> > hard-irq lock-inversion/132: ok | ok | ok |
> > soft-irq lock-inversion/132: ok | ok | ok |
> > hard-irq lock-inversion/213: ok | ok | ok |
> > soft-irq lock-inversion/213: ok | ok | ok |
> > hard-irq lock-inversion/231: ok | ok | ok |
> > soft-irq lock-inversion/231: ok | ok | ok |
> > hard-irq lock-inversion/312: ok | ok | ok |
> > soft-irq lock-inversion/312: ok | ok | ok |
> > hard-irq lock-inversion/321: ok | ok | ok |
> > soft-irq lock-inversion/321: ok | ok | ok |
> > hard-irq read-recursion/123: ok |
> > soft-irq read-recursion/123: ok |
> > hard-irq read-recursion/132: ok |
> > soft-irq read-recursion/132: ok |
> > hard-irq read-recursion/213: ok |
> > soft-irq read-recursion/213: ok |
> > hard-irq read-recursion/231: ok |
> > soft-irq read-recursion/231: ok |
> > hard-irq read-recursion/312: ok |
> > soft-irq read-recursion/312: ok |
> > hard-irq read-recursion/321: ok |
> > soft-irq read-recursion/321: ok |
> > -------------------------------------------------------
> > Good, all 218 testcases passed! |
> > ---------------------------------
> > Calibrating delay loop... 198.04 BogoMIPS (lpj=990208)
> > pid_max: default: 32768 minimum: 301
> > Mount-cache hash table entries: 512
> > CPU: Testing write buffer coherency: ok Setting up static identity
> map
> > for 0x2033ced8 - 0x2033cf30
> > devtmpfs: initialized
> > dummy:
> > NET: Registered protocol family 16
> > AT91: Power Management (with slow clock mode)
> > AT91: Starting after power-restored wakeup
> > bio: create slab <bio-0> at 0
> > at_hdmac ffffec00.dma-controller: Atmel AHB DMA Controller ( cpy
> slave
> > ), 8 chan nels at_hdmac ffffee00.dma-controller: Atmel AHB DMA
> > Controller ( cpy slave ), 8 chan nels SCSI subsystem initialized
> > usbcore: registered new interface driver usbfs
> > usbcore: registered new interface driver hub
> > usbcore: registered new device driver usb
> > cfg80211: Calling CRDA to update world regulatory domain Switching to
> > clocksource tcb_clksrc
> > NET: Registered protocol family 2
> > IP route cache hash table entries: 1024 (order: 0, 4096 bytes) TCP
> > established hash table entries: 4096 (order: 3, 32768 bytes) TCP bind
> > hash table entries: 4096 (order: 5, 147456 bytes)
> > TCP: Hash tables configured (established 4096 bind 4096)
> > TCP: reno registered
> > UDP hash table entries: 64 (order: 0, 5120 bytes) UDP-Lite hash table
> > entries: 64 (order: 0, 5120 bytes)
> > NET: Registered protocol family 1
> > RPC: Registered named UNIX socket transport module.
> > RPC: Registered udp transport module.
> > RPC: Registered tcp transport module.
> > RPC: Registered tcp NFSv4.1 backchannel transport module.
> > NFS: Registering the id_resolver key type
> > jffs2: version 2.2. (NAND) (SUMMARY) © 2001-2006 Red Hat, Inc.
> > msgmni has been set to 234
> > Block layer SCSI generic (bsg) driver version 0.4 loaded (major 252)
> > io scheduler noop registered (default)
> > fffff200.serial: ttyS0 at MMIO 0xfffff200 (irq = 1) is a ATMEL_SERIAL
> > console [ttyS0] enabled
> > f801c000.serial: ttyS1 at MMIO 0xf801c000 (irq = 5) is a ATMEL_SERIAL
> > f8020000.serial: ttyS2 at MMIO 0xf8020000 (irq = 6) is a ATMEL_SERIAL
> > f8028000.serial: ttyS4 at MMIO 0xf8028000 (irq = 8) is a ATMEL_SERIAL
> > brd: module loaded
> > loop: module loaded
> > mtdoops: mtd device (mtddev=name/number) must be supplied
> > atmel_nand: Use On Flash BBT
> > atmel_nand 40000000.nand: No DMA support for NAND access.
> > ONFI param page 0 valid
> > ONFI flash detected
> > NAND device: Manufacturer ID: 0x2c, Chip ID: 0xda (Micron
> > MT29F2G08AAD) Bad block table found at page 131008, version 0x01 Bad
> > block table found at page 130944, version 0x01
> > nand_read_bbt: bad block at 0x000009380000
> > 2 cmdlinepart partitions found on MTD device atmel_nand Creating 2
> MTD
> > partitions on "atmel_nand":
> > 0x000000000000-0x000000800000 : "bootstrap/uboot/kernel"
> > 0x000000800000-0x000010000000 : "rootfs"
> > UBI: attaching mtd1 to ubi0
> > UBI: physical eraseblock size: 131072 bytes (128 KiB)
> > UBI: logical eraseblock size: 126976 bytes
> > UBI: smallest flash I/O unit: 2048
> > UBI: VID header offset: 2048 (aligned 2048)
> > UBI: data offset: 4096
> > UBI: max. sequence number: 4249
> > UBI warning: print_rsvd_warning: cannot reserve enough PEBs for bad
> > PEB handling , reserved 15, need 19
> > UBI: attached mtd1 to ubi0
> > UBI: MTD device name: "rootfs"
> > UBI: MTD device size: 248 MiB
> > UBI: number of good PEBs: 1979
> > UBI: number of bad PEBs: 5
> > UBI: number of corrupted PEBs: 0
> > UBI: max. allowed volumes: 128
> > UBI: wear-leveling threshold: 4096
> > UBI: number of internal volumes: 1
> > UBI: number of user volumes: 1
> > UBI: available PEBs: 0
> > UBI: total number of reserved PEBs: 1979
> > UBI: number of PEBs reserved for bad PEB handling: 15
> > UBI: max/mean erase counter: 5/2
> > UBI: image sequence number: 191777507
> > UBI: background thread "ubi_bgt0d" started, PID 31 UBI error:
> > ubi_init: cannot attach mtd1
> > tun: Universal TUN/TAP device driver, 1.6
> > tun: (C) 1999-2004 Max Krasnyansky <maxk at qualcomm.com> macb
> > f802c000.ethernet: (unregistered net_device): invalid hw address,
> > using ran dom
> > MACB_mii_bus: probed
> > macb f802c000.ethernet: eth0: Cadence MACB at 0xf802c000 irq 24
> (4a:15:f4:49:94:
> > a4)
> > macb f802c000.ethernet: eth0: attached PHY driver [Davicom DM9161A]
> > (mii_bus:phy _addr=f802c000.etherne:00, irq=-1) PPP generic driver
> > version 2.4.2
> > NET: Registered protocol family 24
> > usbcore: registered new interface driver asix
> > usbcore: registered new interface driver cdc_ether
> > usbcore: registered new interface driver cdc_eem
> > usbcore: registered new interface driver net1080
> > usbcore: registered new interface driver cdc_subset
> > usbcore: registered new interface driver zaurus
> > usbcore: registered new interface driver ipheth
> > usbcore: registered new interface driver cdc_ncm
> > ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver atmel-ehci
> > 700000.ehci: Atmel EHCI UHP HS atmel-ehci 700000.ehci: new USB bus
> > registered, assigned bus number 1 atmel-ehci 700000.ehci: irq 22, io
> > mem 0x00700000 atmel-ehci 700000.ehci: USB 2.0 started, EHCI 1.00 usb
> > usb1: New USB device found, idVendor=1d6b, idProduct=0002 usb usb1:
> > New USB device strings: Mfr=3, Product=2, SerialNumber=1 usb usb1:
> > Product: Atmel EHCI UHP HS usb usb1: Manufacturer: Linux 3.4.0
> > ehci_hcd usb usb1: SerialNumber: 700000.ehci hub 1-0:1.0: USB hub
> > found hub 1-0:1.0: 3 ports detected
> > ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver at91_ohci
> > 600000.ohci: AT91 OHCI at91_ohci 600000.ohci: new USB bus registered,
> > assigned bus number 2 at91_ohci 600000.ohci: irq 22, io mem
> 0x00600000
> > usb usb2: New USB device found, idVendor=1d6b, idProduct=0001 usb
> > usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1 usb
> > usb2: Product: AT91 OHCI usb usb2: Manufacturer: Linux 3.4.0 ohci_hcd
> > usb usb2: SerialNumber: at91 hub 2-0:1.0: USB hub found hub 2-0:1.0:
> 2
> > ports detected
> > usbcore: registered new interface driver cdc_acm
> > cdc_acm: USB Abstract Control Model driver for USB modems and ISDN
> > adapters Initializing USB Mass Storage driver...
> > usbcore: registered new interface driver usb-storage USB Mass Storage
> > support registered.
> > usbcore: registered new interface driver libusual
> > usbcore: registered new interface driver usbserial
> > usbcore: registered new interface driver usbserial_generic USB Serial
> > support registered for generic
> > usbserial: USB Serial Driver core
> > usbcore: registered new interface driver moto-modem USB Serial
> support
> > registered for moto-modem
> > usbcore: registered new interface driver opticon USB Serial support
> > registered for opticon
> > usbcore: registered new interface driver pl2303 USB Serial support
> > registered for pl2303
> > usbcore: registered new interface driver qcserial USB Serial support
> > registered for Qualcomm USB modem
> > usbcore: registered new interface driver symbol USB Serial support
> > registered for symbol i2c /dev entries driver
> > usbcore: registered new interface driver usbhid
> > usbhid: USB HID core driver
> > nf_conntrack version 0.5.0 (1872 buckets, 7488 max)
> > IPv4 over IPv4 tunneling driver
> > ip_tables: (C) 2000-2006 Netfilter Core Team
> > TCP: cubic registered
> > NET: Registered protocol family 17
> > lib80211: common routines for IEEE802.11 drivers Registering the
> > dns_resolver key type
> > drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
> > UBIFS: recovery needed
> > UBIFS: recovery completed
> > UBIFS: mounted UBI device 0, volume 0, name "rootfs"
> > UBIFS: file system size: 247476224 bytes (241676 KiB, 236 MiB, 1949
> LEBs)
> > UBIFS: journal size: 9023488 bytes (8812 KiB, 8 MiB, 72 LEBs)
> > UBIFS: media format: w4/r0 (latest is w4/r0)
> > UBIFS: default compressor: lzo
> > UBIFS: reserved for root: 0 bytes (0 KiB)
> > VFS: Mounted root (ubifs filesystem) on device 0:11.
> > devtmpfs: mounted
> > Freeing init memory: 144K
> > INIT: version 2.86 booting
> > Please wait: booting...
> > Starting udev
> > udev[62]: starting version 165
> > Root filesystem already rw, not remounting Caching udev devnodes
> > Populating dev cache
> > logger: mount: mount point /proc/bus/usb does not exist
> > ALSA: Restoring mixer settings...
> > /usr/sbin/alsactl: load_state:1625: No soundcards found...
> > Configuring network interfaces... eth0 no wireless extensions.
> >
> > udhcpc (v1.18.3) started
> > run-parts: /etc/udhcpc.d/00avahi-autoipd exited with code 1 Sending
> > discover...
> > Sending discover...
> > Sending discover...
> > netlink: 12 bytes leftover after parsing attributes.
> > netlink: 12 bytes leftover after parsing attributes.
> > netlink: 12 bytes leftover after parsing attributes.
> > No lease, failing
> > done.
> > Starting portmap daemon: portmap.
> > net.ipv4.conf.default.rp_filter = 1
> > net.ipv4.conf.all.rp_filter = 1
> > kernel.panic = 10
> > hwclock: can't open '/dev/misc/rtc': No such file or directory Mon
> Nov
> > 5 09:47:00 EST 2012
> > hwclock: can't open '/dev/misc/rtc': No such file or directory
> > INIT: Entering runlevel: 5
> > Starting system message bus: dbus.
> > Starting Dropbear SSH server: dropbear.
> > starting Busybox HTTP Daemon: httpd... done.
> > Starting Vixie-cron.
> > Starting ntpd: done
> > Starting syslogd/klogd: done
> > * Starting Avahi mDNS/DNS-SD Daemon: avahi-daemon
> > ...done.
> >
> >>> I noticed over at the linux-at91 fork that you had applied the
> PMECC
> >>> support on the 3.4.x_pmecc_dt_9x5 branch a few months ago. From
> >>> browsing the mainline I didn't see some of your changes from that
> >>> branch in the mainline. Are there some changes from the linux-at91
> >> fork that are still scheduled for mainlining?
> >> yes, this patch is not push to mainline yet. Currently the only
> >> concern is we are think about the PMECC error correct bits need to
> >> adjust by ONFI parameters that read from nand flash.
> >> But it is not decide yet. if no exception, this patch will push to
> >> mainline soon.
> >>
> >> Best Regards,
> >> Josh Wu
> >>
> >>> If it helps, here is the boot log when I tried to boot using a 3.7-
> >> rc8
> >>> kernel and DT.
> >>>
> >>> Thanks,
> >>> Bryan
> >>>
> >>> Uncompressing Linux... done, booting the kernel.
> >>> [ 0.000000] Booting Linux on physical CPU 0
> >>> [ 0.000000] Linux version 3.7.0-rc8-armv5-x0.16 (xxxx at xxxx) (gcc
> >> versio
> >>> n 4.6.2 20121016 (release) [ARM/embedded-4_6-branch revision
> 192487]
> >>> (GNU Tools for ARM Embedded Processors) ) #1 Wed Dec 5 16:11:30 EST
> >> 2012
> >>> [ 0.000000] CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ),
> >> cr=00053177
> >>> [ 0.000000] CPU: VIVT data cache, VIVT instruction cache
> >>> [ 0.000000] Machine: Atmel AT91SAM (Device Tree), model: Atmel
> >> AT91SAM9G25-EK
> >>> [ 0.000000] Memory policy: ECC disabled, Data cache writeback
> >>> [ 0.000000] AT91: Detected soc type: at91sam9x5
> >>> [ 0.000000] AT91: Detected soc subtype: at91sam9g25
> >>> [ 0.000000] AT91: sram at 0x300000 of 0x8000 mapped at
> 0xfef70000
> >>> [ 0.000000] Clocks: CPU 400 MHz, master 133 MHz, main 12.000 MHz
> >>> [ 0.000000] Built 1 zonelists in Zone order, mobility grouping
> on.
> >> Total pag
> >>> es: 32512
> >>> [ 0.000000] Kernel command line: mem=128M console=ttyS0,115200
> >> mtdparts=atmel
> >>> _nand:8M(bootstrap/uboot/kernel)ro,-(rootfs) root=/dev/mtdblock1 rw
> >>> rootfstype=u bifs ubi.mtd=1 root=ubi0:rootfs
> >>> [ 0.000000] PID hash table entries: 512 (order: -1, 2048 bytes)
> >>> [ 0.000000] Dentry cache hash table entries: 16384 (order: 4,
> >> 65536 bytes)
> >>> [ 0.000000] Inode-cache hash table entries: 8192 (order: 3,
> 32768
> >> bytes)
> >>> [ 0.000000] Memory: 128MB = 128MB total
> >>> [ 0.000000] Memory: 124276k/124276k available, 6796k reserved,
> 0K
> >> highmem
> >>> [ 0.000000] Virtual kernel memory layout:
> >>> [ 0.000000] vector : 0xffff0000 - 0xffff1000 ( 4 kB)
> >>> [ 0.000000] fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)
> >>> [ 0.000000] vmalloc : 0xc8800000 - 0xff000000 ( 872 MB)
> >>> [ 0.000000] lowmem : 0xc0000000 - 0xc8000000 ( 128 MB)
> >>> [ 0.000000] modules : 0xbf000000 - 0xc0000000 ( 16 MB)
> >>> [ 0.000000] .text : 0xc0008000 - 0xc04b8630 (4802 kB)
> >>> [ 0.000000] .init : 0xc04b9000 - 0xc04e45c4 ( 174 kB)
> >>> [ 0.000000] .data : 0xc04e6000 - 0xc0516ce0 ( 196 kB)
> >>> [ 0.000000] .bss : 0xc0516d04 - 0xc05760bc ( 381 kB)
> >>> [ 0.000000] NR_IRQS:16 nr_irqs:16 16
> >>> [ 0.000000] sched_clock: 32 bits at 256 Hz, resolution
> 3906250ns,
> >> wraps every
> >>> 3892314108ms
> >>> [ 0.000000] Console: colour dummy device 80x30
> >>> [ 0.035156] Calibrating delay loop... 199.80 BogoMIPS
> (lpj=389120)
> >>> [ 0.035156] pid_max: default: 32768 minimum: 301
> >>> [ 0.035156] Mount-cache hash table entries: 512
> >>> [ 0.039062] CPU: Testing write buffer coherency: ok
> >>> [ 0.039062] Setting up static identity map for 0x20371d48 -
> >> 0x20371da0
> >>> [ 0.039062] devtmpfs: initialized
> >>> [ 0.042968] NET: Registered protocol family 16
> >>> [ 0.042968] DMA: preallocated 256 KiB pool for atomic coherent
> >> allocations
> >>> [ 0.070312] No ATAGs?
> >>> [ 0.070312] AT91: Power Management
> >>> [ 0.070312] AT91: Starting after power-restored wakeup
> >>> [ 0.121093] bio: create slab <bio-0> at 0
> >>> [ 0.125000] SCSI subsystem initialized
> >>> [ 0.128906] usbcore: registered new interface driver usbfs
> >>> [ 0.128906] usbcore: registered new interface driver hub
> >>> [ 0.128906] usbcore: registered new device driver usb
> >>> [ 0.132812] at91_i2c f8010000.i2c: AT91 i2c bus driver.
> >>> [ 0.132812] at91_i2c f8014000.i2c: AT91 i2c bus driver.
> >>> [ 0.136718] at91_i2c f8018000.i2c: AT91 i2c bus driver.
> >>> [ 0.140625] Switching to clocksource tcb_clksrc
> >>> [ 0.195312] NET: Registered protocol family 2
> >>> [ 0.199218] TCP established hash table entries: 4096 (order: 3,
> >> 32768 bytes)
> >>> [ 0.199218] TCP bind hash table entries: 4096 (order: 2, 16384
> >> bytes)
> >>> [ 0.199218] TCP: Hash tables configured (established 4096 bind
> >> 4096)
> >>> [ 0.199218] TCP: reno registered
> >>> [ 0.199218] UDP hash table entries: 256 (order: 0, 4096 bytes)
> >>> [ 0.199218] UDP-Lite hash table entries: 256 (order: 0, 4096
> >> bytes)
> >>> [ 0.199218] NET: Registered protocol family 1
> >>> [ 0.199218] RPC: Registered named UNIX socket transport module.
> >>> [ 0.199218] RPC: Registered udp transport module.
> >>> [ 0.199218] RPC: Registered tcp transport module.
> >>> [ 0.199218] RPC: Registered tcp NFSv4.1 backchannel transport
> >> module.
> >>> [ 0.207031] NFS: Registering the id_resolver key type
> >>> [ 0.207031] Key type id_resolver registered
> >>> [ 0.207031] Key type id_legacy registered
> >>> [ 0.207031] jffs2: version 2.2. (NAND) �© 2001-2006 Red Hat,
> >> Inc.
> >>> [ 0.207031] msgmni has been set to 242
> >>> [ 0.210937] io scheduler noop registered (default)
> >>> [ 0.218750] fffff200.serial: ttyS0 at MMIO 0xfffff200 (irq = 18)
> >> is a ATMEL_S
> >>> ERIAL
> >>> [ 0.609375] console [ttyS0] enabled
> >>> [ 0.613281] f801c000.serial: ttyS1 at MMIO 0xf801c000 (irq = 22)
> >> is a ATMEL_S
> >>> ERIAL
> >>> [ 0.632812] brd: module loaded
> >>> [ 0.652343] loop: module loaded
> >>> [ 0.667968] atmel_nand: Use On Flash BBT
> >>> [ 0.671875] atmel_nand 40000000.nand: No DMA support for NAND
> >> access.
> >>> [ 0.675781] ONFI param page 0 valid
> >>> [ 0.679687] ONFI flash detected
> >>> [ 0.683593] NAND device: Manufacturer ID: 0x2c, Chip ID: 0xda
> >> (Micron MT29F2G
> >>> 08AAD), page size: 2048, OOB size: 64
> >>> [ 0.695312] atmel_nand 40000000.nand: Initialize PMECC params,
> >> cap: 2, sector
> >>> : 512
> >>> [ 0.703125] Bad block table found at page 131008, version 0x01
> >>> [ 0.707031] Bad block table found at page 130944, version 0x01
> >>> [ 0.714843] nand_read_bbt: bad block at 0x000009380000
> >>> [ 0.718750] 2 cmdlinepart partitions found on MTD device
> >> atmel_nand
> >>> [ 0.726562] Creating 2 MTD partitions on "atmel_nand":
> >>> [ 0.730468] 0x000000000000-0x000000800000 :
> >> "bootstrap/uboot/kernel"
> >>> [ 0.742187] 0x000000800000-0x000010000000 : "rootfs"
> >>> [ 0.757812] macb f802c000.ethernet (unregistered net_device):
> >> invalid hw addr
> >>> ess, using random
> >>> [ 0.773437] libphy: MACB_mii_bus: probed
> >>> [ 0.777343] macb f802c000.ethernet eth0: Cadence MACB at
> >> 0xf802c000 irq 23 (c
> >>> a:2c:e6:c3:59:8f)
> >>> [ 0.785156] macb f802c000.ethernet eth0: attached PHY driver
> >> [Davicom DM9161A
> >>> ] (mii_bus:phy_addr=f802c000.etherne:00, irq=-1)
> >>> [ 0.796875] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI)
> >> Driver
> >>> [ 0.804687] atmel-ehci 700000.ehci: Atmel EHCI UHP HS
> >>> [ 0.808593] atmel-ehci 700000.ehci: new USB bus registered,
> >> assigned bus numb
> >>> er 1
> >>> [ 0.816406] atmel-ehci 700000.ehci: irq 28, io mem 0x00700000
> >>> [ 0.835937] atmel-ehci 700000.ehci: USB 2.0 started, EHCI 1.00
> >>> [ 0.839843] usb usb1: New USB device found, idVendor=1d6b,
> >> idProduct=0002
> >>> [ 0.847656] usb usb1: New USB device strings: Mfr=3, Product=2,
> >> SerialNumber=
> >>> 1
> >>> [ 0.855468] usb usb1: Product: Atmel EHCI UHP HS
> >>> [ 0.859375] usb usb1: Manufacturer: Linux 3.7.0-rc8-armv5-x0.16
> >> ehci_hcd
> >>> [ 0.867187] usb usb1: SerialNumber: 700000.ehci
> >>> [ 0.871093] hub 1-0:1.0: USB hub found
> >>> [ 0.875000] hub 1-0:1.0: 3 ports detected
> >>> [ 0.878906] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI)
> Driver
> >>> [ 0.886718] at91_ohci 600000.ohci: AT91 OHCI
> >>> [ 0.890625] at91_ohci 600000.ohci: new USB bus registered,
> >> assigned bus numbe
> >>> r 2
> >>> [ 0.898437] at91_ohci 600000.ohci: irq 28, io mem 0x00600000
> >>> [ 0.964843] usb usb2: New USB device found, idVendor=1d6b,
> >> idProduct=0001
> >>> [ 0.968750] usb usb2: New USB device strings: Mfr=3, Product=2,
> >> SerialNumber=
> >>> 1
> >>> [ 0.976562] usb usb2: Product: AT91 OHCI
> >>> [ 0.980468] usb usb2: Manufacturer: Linux 3.7.0-rc8-armv5-x0.16
> >> ohci_hcd
> >>> [ 0.988281] usb usb2: SerialNumber: at91
> >>> [ 0.992187] hub 2-0:1.0: USB hub found
> >>> [ 0.996093] hub 2-0:1.0: 2 ports detected
> >>> [ 1.003906] usbcore: registered new interface driver cdc_acm
> >>> [ 1.007812] cdc_acm: USB Abstract Control Model driver for USB
> >> modems and ISD
> >>> N adapters
> >>> [ 1.019531] usbcore: registered new interface driver uas
> >>> [ 1.023437] Initializing USB Mass Storage driver...
> >>> [ 1.027343] usbcore: registered new interface driver usb-storage
> >>> [ 1.035156] USB Mass Storage support registered.
> >>> [ 1.039062] usbcore: registered new interface driver ums-alauda
> >>> [ 1.046875] usbcore: registered new interface driver ums-cypress
> >>> [ 1.054687] usbcore: registered new interface driver ums-datafab
> >>> [ 1.058593] usbcore: registered new interface driver
> ums_eneub6250
> >>> [ 1.066406] usbcore: registered new interface driver ums-freecom
> >>> [ 1.074218] usbcore: registered new interface driver ums-isd200
> >>> [ 1.078125] usbcore: registered new interface driver ums-
> jumpshot
> >>> [ 1.085937] usbcore: registered new interface driver ums-karma
> >>> [ 1.093750] usbcore: registered new interface driver ums-
> onetouch
> >>> [ 1.097656] usbcore: registered new interface driver ums-realtek
> >>> [ 1.105468] usbcore: registered new interface driver ums-sddr09
> >>> [ 1.113281] usbcore: registered new interface driver ums-sddr55
> >>> [ 1.117187] usbcore: registered new interface driver ums-usbat
> >>> [ 1.125000] usbcore: registered new interface driver usbserial
> >>> [ 1.132812] usbcore: registered new interface driver
> >> usbserial_generic
> >>> [ 1.140625] usbserial: USB Serial support registered for generic
> >>> [ 1.144531] usbcore: registered new interface driver ftdi_sio
> >>> [ 1.152343] usbserial: USB Serial support registered for FTDI
> USB
> >> Serial Devi
> >>> ce
> >>> [ 1.160156] usbcore: registered new interface driver pl2303
> >>> [ 1.167968] usbserial: USB Serial support registered for pl2303
> >>> [ 1.171875] mousedev: PS/2 mouse device common for all mice
> >>> [ 1.179687] i2c /dev entries driver
> >>> [ 1.191406] usbcore: registered new interface driver usbhid
> >>> [ 1.199218] usbhid: USB HID core driver
> >>> [ 1.207031] usb 1-2: new high-speed USB device number 2 using
> >> atmel-ehci
> >>> [ 1.214843] TCP: cubic registered
> >>> [ 1.218750] NET: Registered protocol family 10
> >>> [ 1.222656] sit: IPv6 over IPv4 tunneling driver
> >>> [ 1.230468] NET: Registered protocol family 17
> >>> [ 1.234375] Key type dns_resolver registered
> >>> [ 1.246093] UBI: attaching mtd1 to ubi0
> >>> [ 1.253906] atmel_nand 40000000.nand: PMECC: Too many errors
> >>> [ 1.261718] UBI warning: ubi_io_read: error -5 while reading 64
> >> bytes from PE
> >>> B 10:0, read only 0 bytes, retry
> >>> [ 1.269531] atmel_nand 40000000.nand: PMECC: Too many errors
> >>> [ 1.277343] UBI warning: ubi_io_read: error -5 while reading 64
> >> bytes from PE
> >>> B 10:0, read only 0 bytes, retry
> >>> [ 1.285156] atmel_nand 40000000.nand: PMECC: Too many errors
> >>> [ 1.292968] UBI warning: ubi_io_read: error -5 while reading 64
> >> bytes from PE
> >>> B 10:0, read only 0 bytes, retry
> >>> [ 1.304687] atmel_nand 40000000.nand: PMECC: Too many errors
> >>> [ 1.308593] UBI error: ubi_io_read: error -5 while reading 64
> >> bytes from PEB
> >>> 10:0, read 0 bytes
> >>> [ 1.316406] [<c000d2bc>] (unwind_backtrace+0x0/0xe0) from
> >> [<c0243a10>] (ubi_i
> >>> o_read+0x1d4/0x2a4)
> >>> [ 1.328125] [<c0243a10>] (ubi_io_read+0x1d4/0x2a4) from
> >> [<c0243d20>] (ubi_io_
> >>> read_ec_hdr+0x68/0x214)
> >>> [ 1.335937] [<c0243d20>] (ubi_io_read_ec_hdr+0x68/0x214) from
> >> [<c024804c>] (u
> >>> bi_attach+0x104/0x13e4)
> >>> [ 1.343750] [<c024804c>] (ubi_attach+0x104/0x13e4) from
> >> [<c023e514>] (ubi_att
> >>> ach_mtd_dev+0x5a4/0xb94)
> >>> [ 1.355468] [<c023e514>] (ubi_attach_mtd_dev+0x5a4/0xb94) from
> >> [<c04d09dc>] (
> >>> ubi_init+0x1d8/0x2d8)
> >>> [ 1.363281] [<c04d09dc>] (ubi_init+0x1d8/0x2d8) from
> [<c0008860>]
> >> (do_one_ini
> >>> tcall+0x90/0x168)
> >>> [ 1.371093] [<c0008860>] (do_one_initcall+0x90/0x168) from
> >> [<c03686a4>] (kern
> >>> el_init+0xe8/0x2a0)
> >>> [ 1.378906] [<c03686a4>] (kernel_init+0xe8/0x2a0) from
> >> [<c00093f0>] (ret_from
> >>> _fork+0x14/0x24)
> >>> [ 1.386718] UBI error: ubi_attach_mtd_dev: failed to attach
> mtd1,
> >> error -5
> >>> [ 1.394531] UBI error: ubi_init: cannot attach mtd1
> >>> [ 1.402343] drivers/rtc/hctosys.c: unable to open rtc device
> >> (rtc0)
> >>> [ 1.410156] UBIFS error (pid 1): ubifs_mount: cannot open
> >> "ubi0:rootfs", erro
> >>> r -19
> >>> [ 1.417968] VFS: Cannot open root device "ubi0:rootfs" or
> unknown-
> >> block(0,0):
> >>> error -19
> >>> [ 1.425781] Please append a correct "root=" boot option; here
> are
> >> the availab
> >>> le partitions:
> >>> [ 1.433593] 1f00 8192 mtdblock0 (driver?)
> >>> [ 1.437500] 1f01 253952 mtdblock1 (driver?)
> >>> [ 1.441406] Kernel panic - not syncing: VFS: Unable to mount
> root
> >> fs on unkno
> >>> wn-block(0,0)
> >>>
> >>>
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