[PATCH 1/2] dt-bindings: mtd: nand: Macronix: document new binding

Álvaro Fernández Rojas noltari at gmail.com
Wed May 17 08:20:26 PDT 2023 

Hi William,

El mié, 17 may 2023 a las 7:30, William Zhang
(<william.zhang at broadcom.com>) escribió:
>
>
>
> On 05/16/2023 12:02 PM, Álvaro Fernández Rojas wrote:
> > Sure,
> >
> > Here you go:
> > [    0.000000] Linux version 5.15.111 (noltari at atlantis)
> > (mips-openwrt-linux-musl-gcc (OpenWrt GCC 12.3.0 r0+22899-466be0612a)
> > 12.3.0, GNU ld (GNU Binutils) 2.40.0) #0 SMP Tue May 16 14:33:20 2023
> > [    0.000000] CPU0 revision is: 0002a080 (Broadcom BMIPS4350)
> > [    0.000000] MIPS: machine is Sercomm H500-s vfes
> > [    0.000000] 128MB of RAM installed
> > [    0.000000] earlycon: bcm63xx_uart0 at MMIO 0x10000180 (options '115200n8')
> > [    0.000000] printk: bootconsole [bcm63xx_uart0] enabled
> > [    0.000000] Initrd not found or empty - disabling initrd
> > [    0.000000] Reserving 0KB of memory at 4194303KB for kdump
> > [    0.000000] Primary instruction cache 64kB, VIPT, 4-way, linesize 16 bytes.
> > [    0.000000] Primary data cache 32kB, 2-way, VIPT, cache aliases,
> > linesize 16 bytes
> > [    0.000000] Zone ranges:
> > [    0.000000]   Normal   [mem 0x0000000000000000-0x0000000007ffffff]
> > [    0.000000] Movable zone start for each node
> > [    0.000000] Early memory node ranges
> > [    0.000000]   node   0: [mem 0x0000000000000000-0x0000000007ffffff]
> > [    0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x0000000007ffffff]
> > [    0.000000] percpu: Embedded 11 pages/cpu s13328 r8192 d23536 u45056
> > [    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 32480
> > [    0.000000] Kernel command line: earlycon
> > [    0.000000] Dentry cache hash table entries: 16384 (order: 4, 65536
> > bytes, linear)
> > [    0.000000] Inode-cache hash table entries: 8192 (order: 3, 32768
> > bytes, linear)
> > [    0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
> > [    0.000000] Memory: 108656K/131072K available (6902K kernel code,
> > 613K rwdata, 1404K rodata, 11872K init, 215K bss, 22416K reserved, 0K
> > cma-reserved)
> > [    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1
> > [    0.000000] rcu: Hierarchical RCU implementation.
> > [    0.000000]  Tracing variant of Tasks RCU enabled.
> > [    0.000000] rcu: RCU calculated value of scheduler-enlistment delay
> > is 10 jiffies.
> > [    0.000000] NR_IRQS: 256
> > [    0.000000] irq_bcm6345_l1: registered BCM6345 L1 intc (IRQs: 128)
> > [    0.000000] irq_bcm6345_l1:   CPU0 (irq = 2)
> > [    0.000000] irq_bcm6345_l1:   CPU1 (irq = 3)
> > [    0.000000] brcm,bcm63268 detected @ 400 MHz
> > [    0.000000] clocksource: MIPS: mask: 0xffffffff max_cycles:
> > 0xffffffff, max_idle_ns: 9556302233 ns
> > [    0.000002] sched_clock: 32 bits at 200MHz, resolution 5ns, wraps
> > every 10737418237ns
> > [    0.008292] Calibrating delay loop... 398.13 BogoMIPS (lpj=1990656)
> > [    0.074683] pid_max: default: 32768 minimum: 301
> > [    0.081788] Mount-cache hash table entries: 1024 (order: 0, 4096
> > bytes, linear)
> > [    0.089319] Mountpoint-cache hash table entries: 1024 (order: 0,
> > 4096 bytes, linear)
> > [    0.106094] rcu: Hierarchical SRCU implementation.
> > [    0.112665] smp: Bringing up secondary CPUs ...
> > [    0.119348] SMP: Booting CPU1...
> > [    8.330979] Primary instruction cache 64kB, VIPT, 4-way, linesize 16 bytes.
> > [    8.331017] Primary data cache 32kB, 2-way, VIPT, cache aliases,
> > linesize 16 bytes
> > [    8.331294] CPU1 revision is: 0002a080 (Broadcom BMIPS4350)
> > [    0.182819] Synchronize counters for CPU 1:
> > [    0.203500] SMP: CPU1 is running
> > [    0.203512] done.
> > [    0.213401] smp: Brought up 1 node, 2 CPUs
> > [    0.228870] clocksource: jiffies: mask: 0xffffffff max_cycles:
> > 0xffffffff, max_idle_ns: 19112604462750000 ns
> > [    0.239058] futex hash table entries: 512 (order: 3, 32768 bytes, linear)
> > [    0.246439] pinctrl core: initialized pinctrl subsystem
> > [    0.254917] NET: Registered PF_NETLINK/PF_ROUTE protocol family
> > [    0.312700] clocksource: Switched to clocksource MIPS
> > [    0.321061] NET: Registered PF_INET protocol family
> > [    0.326879] IP idents hash table entries: 2048 (order: 2, 16384
> > bytes, linear)
> > [    0.335972] tcp_listen_portaddr_hash hash table entries: 512
> > (order: 0, 6144 bytes, linear)
> > [    0.344721] Table-perturb hash table entries: 65536 (order: 6,
> > 262144 bytes, linear)
> > [    0.352721] TCP established hash table entries: 1024 (order: 0,
> > 4096 bytes, linear)
> > [    0.360622] TCP bind hash table entries: 1024 (order: 1, 8192 bytes, linear)
> > [    0.368005] TCP: Hash tables configured (established 1024 bind 1024)
> > [    0.375074] UDP hash table entries: 256 (order: 1, 8192 bytes, linear)
> > [    0.381862] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes, linear)
> > [    0.389762] NET: Registered PF_UNIX/PF_LOCAL protocol family
> > [    0.395748] PCI: CLS 0 bytes, default 16
> > [    0.403410] workingset: timestamp_bits=14 max_order=15 bucket_order=1
> > [    0.426490] squashfs: version 4.0 (2009/01/31) Phillip Lougher
> > [    0.432492] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME)
> > (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
> > [    0.459472] bcm63xx-power-controller 1000184c.power-controller:
> > registered 14 power domains
> > [    0.470267] 10000180.serial: ttyS0 at MMIO 0x10000180 (irq = 8,
> > base_baud = 1562500) is a bcm63xx_uart
> > [    0.479996] printk: console [ttyS0] enabled
> > [    0.479996] printk: console [ttyS0] enabled
> > [    0.488651] printk: bootconsole [bcm63xx_uart0] disabled
> > [    0.488651] printk: bootconsole [bcm63xx_uart0] disabled
> > [    0.533435] bcm2835-rng 10002880.rng: hwrng registered
> > [    0.606025] bcm6368_nand 10000200.nand: there is not valid maps for
> > state default
> > [    0.633977] nand: device found, Manufacturer ID: 0xc2, Chip ID: 0xf1
> > [    0.640506] nand: Macronix MX30LF1G18AC
> > [    0.644551] nand: 128 MiB, SLC, erase size: 128 KiB, page size:
> > 2048, OOB size: 64
> > [    0.652359] bcm6368_nand 10000200.nand: detected 128MiB total,
> > 128KiB blocks, 2KiB pages, 16B OOB, 8-bit, BCH-4
> > [    0.703373] Bad block table not found for chip 0
> > [    0.732040] Bad block table not found for chip 0
> > [    0.736842] Scanning device for bad blocks
> > [    0.832678] CPU 0 Unable to handle kernel paging request at virtual
> > address 00000014, epc == 8009b300, ra == 806cc650
> > [    0.843628] Oops[#1]:
> > [    0.845958] CPU: 0 PID: 88 Comm: hwrng Not tainted 5.15.111 #0
> > [    0.851959] $ 0   : 00000000 00000001 00000008 00000000
> > [    0.857358] $ 4   : 81808464 00000064 00000000 00000001
> > [    0.862753] $ 8   : 81810000 00001ff0 00001c00 815b8880
> > [    0.868146] $12   : 0000b79d 00000000 00000000 00009bb
> >
> > Please, tell me if you want me to add any debugging to the log.
> >
> > Best regards,
> > Álvaro.
> >
> > El mar, 16 may 2023 a las 20:58, Florian Fainelli
> > (<f.fainelli at gmail.com>) escribió:
> >>
> >> +William,
> >>
> >> On 5/16/23 11:55, Álvaro Fernández Rojas wrote:
> >>> Hi Jaime,
> >>>
> >>> I've reproduced the issue on a Comtrend VR-3032u (MX30LF1G08AA). After
> >>> forcing it to check block protection (it's not supported on that
> >>> device), the NAND controller stops reading/writing anything.
> >>>
> >>> @Florian is it possible that low level ops (GET_FEATURES/SET_FEATURES)
> >>> aren't supported on BCM63268 NAND controllers and this is causing the
> >>> issue?
> >>
> >> Yes, this looks like what we have seen as well even with newer NAND
> >> controllers actually. Would it be possible to obtain a full log from
> >> either of you?
> >>
> >> William, is this something you have seen before as well?
> >>
> No, I haven't seen such issue before.  It is possible I didn't have this
>   Macronix parts in my board. If I can find a board with Macronix part,
> I will try it. But we don't use this feature and don't connect the PT
> pin in our reference board which means the PT feature is disabled in the
> nand part.
>
> Alvaro, Do you know if your 63268 board has PT pin connected or not?

No, I don't know if PT pin is connected.
I would have to open the case and check, but judging from the
following image I would say it's not connected:
https://openwrt.org/_media/media/sercomm/h500s/h500s-nand.jpg

> Can you check if the macronix's lock and unlock function being calling
> before the hang?   Or is it just get/set feature function getting called
> to determine PT is supported?   The get/set feature function should work
> as they are used by other pathes

No, the macronix's lock/unlock functions aren't called before the hang.
In fact, if I comment out the nand_get_features call and replace it
with ret = 1 it doesn't hang:
https://github.com/torvalds/linux/blob/f1fcbaa18b28dec10281551dfe6ed3a3ed80e3d6/drivers/mtd/nand/raw/nand_macronix.c#L229-L230

>
>
> >>>
> >>> Best regards,
> >>> Álvaro.
> >>>
> >>> El mié, 26 abr 2023 a las 9:24, liao jaime (<jaimeliao.tw at gmail.com>) escribió:
> >>>>
> >>>> Hi Álvaro
> >>>>
> >>>> In nand_scan_tail(), each manufacturer init function call will be execute.
> >>>> In macronix_nand_init(), block protect will be execute after flash detect.
> >>>> I have validate MX30LF1G18AC in Linux kernel v5.15.
> >>>> I didn't got situation "device hangs"  on my side.
> >>>> BP is to prevent incorrect operations.
> >>>> Please check the controller settings for tracing this issue.
> >>>>
> >>>> Thanks
> >>>> Jaime
> >>>>
> >>>>>
> >>>>> Hello YouChing and Jaime,
> >>>>>
> >>>>> I still didn't get any feedback from you (or Macronix) on this issue.
> >>>>> Did you have time to look into it?
> >>>>>
> >>>>> Thanks,
> >>>>> Álvaro.
> >>>>>
> >>>>> El vie, 24 mar 2023 a las 18:04, Álvaro Fernández Rojas
> >>>>> (<noltari at gmail.com>) escribió:
> >>>>>>
> >>>>>> Hi Miquèl,
> >>>>>>
> >>>>>> 2023-03-24 15:36 GMT+01:00, Miquel Raynal <miquel.raynal at bootlin.com>:
> >>>>>>> Hi Álvaro,
> >>>>>>>
> >>>>>>> + YouChing and Jaime from Macronix
> >>>>>>> TLDR for them: there is a misbehavior since Mason added block
> >>>>>>> protection support. Just checking if the blocks are protected seems to
> >>>>>>> misconfigure the chip entirely, see below. Any hints?
> >>>>>>
> >>>>>> Could it be that the NAND is stuck expecting a read 0x00 command which
> >>>>>> isn’t sent after getting the features?
> >>>>>>
> >>>>>>>
> >>>>>>> noltari at gmail.com wrote on Fri, 24 Mar 2023 15:15:47 +0100:
> >>>>>>>
> >>>>>>>> Hi Miquèl,
> >>>>>>>>
> >>>>>>>> 2023-03-24 14:45 GMT+01:00, Miquel Raynal <miquel.raynal at bootlin.com>:
> >>>>>>>>> Hi Álvaro,
> >>>>>>>>>
> >>>>>>>>> noltari at gmail.com wrote on Fri, 24 Mar 2023 12:21:11 +0100:
> >>>>>>>>>
> >>>>>>>>>> El vie, 24 mar 2023 a las 11:49, Miquel Raynal
> >>>>>>>>>> (<miquel.raynal at bootlin.com>) escribió:
> >>>>>>>>>>>
> >>>>>>>>>>> Hi Álvaro,
> >>>>>>>>>>>
> >>>>>>>>>>> noltari at gmail.com wrote on Fri, 24 Mar 2023 11:31:17 +0100:
> >>>>>>>>>>>
> >>>>>>>>>>>> Hi Miquèl,
> >>>>>>>>>>>>
> >>>>>>>>>>>> El vie, 24 mar 2023 a las 10:40, Miquel Raynal
> >>>>>>>>>>>> (<miquel.raynal at bootlin.com>) escribió:
> >>>>>>>>>>>>>
> >>>>>>>>>>>>> Hi Álvaro,
> >>>>>>>>>>>>>
> >>>>>>>>>>>>> noltari at gmail.com wrote on Thu, 23 Mar 2023 13:45:09 +0100:
> >>>>>>>>>>>>>
> >>>>>>>>>>>>>> Add new "mxic,disable-block-protection" binding documentation.
> >>>>>>>>>>>>>> This binding allows disabling block protection support for
> >>>>>>>>>>>>>> those
> >>>>>>>>>>>>>> devices not
> >>>>>>>>>>>>>> supporting it.
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>> Signed-off-by: Álvaro Fernández Rojas <noltari at gmail.com>
> >>>>>>>>>>>>>> ---
> >>>>>>>>>>>>>>    Documentation/devicetree/bindings/mtd/nand-macronix.txt | 3
> >>>>>>>>>>>>>> +++
> >>>>>>>>>>>>>>    1 file changed, 3 insertions(+)
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>> diff --git
> >>>>>>>>>>>>>> a/Documentation/devicetree/bindings/mtd/nand-macronix.txt
> >>>>>>>>>>>>>> b/Documentation/devicetree/bindings/mtd/nand-macronix.txt
> >>>>>>>>>>>>>> index ffab28a2c4d1..03f65ca32cd3 100644
> >>>>>>>>>>>>>> --- a/Documentation/devicetree/bindings/mtd/nand-macronix.txt
> >>>>>>>>>>>>>> +++ b/Documentation/devicetree/bindings/mtd/nand-macronix.txt
> >>>>>>>>>>>>>> @@ -16,6 +16,9 @@ in children nodes.
> >>>>>>>>>>>>>>    Required NAND chip properties in children mode:
> >>>>>>>>>>>>>>    - randomizer enable: should be "mxic,enable-randomizer-otp"
> >>>>>>>>>>>>>>
> >>>>>>>>>>>>>> +Optional NAND chip properties in children mode:
> >>>>>>>>>>>>>> +- block protection disable: should be
> >>>>>>>>>>>>>> "mxic,disable-block-protection"
> >>>>>>>>>>>>>> +
> >>>>>>>>>>>>>
> >>>>>>>>>>>>> Besides the fact that nowadays we prefer to see binding
> >>>>>>>>>>>>> conversions
> >>>>>>>>>>>>> to
> >>>>>>>>>>>>> yaml before adding anything, I don't think this will fly.
> >>>>>>>>>>>>>
> >>>>>>>>>>>>> I'm not sure exactly what "disable block protection" means, we
> >>>>>>>>>>>>> already have similar properties like "lock" and
> >>>>>>>>>>>>> "secure-regions",
> >>>>>>>>>>>>> not
> >>>>>>>>>>>>> sure they will fit but I think it's worth checking.
> >>>>>>>>>>>>
> >>>>>>>>>>>> As explained in 2/2, commit 03a539c7a118 introduced a regression
> >>>>>>>>>>>> on
> >>>>>>>>>>>> Sercomm H500-s (BCM63268) OpenWrt devices with Macronix
> >>>>>>>>>>>> MX30LF1G18AC
> >>>>>>>>>>>> which hangs the device.
> >>>>>>>>>>>>
> >>>>>>>>>>>> This is the log with block protection disabled:
> >>>>>>>>>>>> [    0.495831] bcm6368_nand 10000200.nand: there is not valid maps
> >>>>>>>>>>>> for
> >>>>>>>>>>>> state default
> >>>>>>>>>>>> [    0.504995] nand: device found, Manufacturer ID: 0xc2, Chip ID:
> >>>>>>>>>>>> 0xf1
> >>>>>>>>>>>> [    0.511526] nand: Macronix MX30LF1G18AC
> >>>>>>>>>>>> [    0.515586] nand: 128 MiB, SLC, erase size: 128 KiB, page size:
> >>>>>>>>>>>> 2048, OOB size: 64
> >>>>>>>>>>>> [    0.523516] bcm6368_nand 10000200.nand: detected 128MiB total,
> >>>>>>>>>>>> 128KiB blocks, 2KiB pages, 16B OOB, 8-bit, BCH-4
> >>>>>>>>>>>> [    0.535912] Bad block table found at page 65472, version 0x01
> >>>>>>>>>>>> [    0.544268] Bad block table found at page 65408, version 0x01
> >>>>>>>>>>>> [    0.954329] 9 fixed-partitions partitions found on MTD device
> >>>>>>>>>>>> brcmnand.0
> >>>>>>>>>>>> ...
> >>>>>>>>>>>>
> >>>>>>>>>>>> This is the log with block protection enabled:
> >>>>>>>>>>>> [    0.495095] bcm6368_nand 10000200.nand: there is not valid maps
> >>>>>>>>>>>> for
> >>>>>>>>>>>> state default
> >>>>>>>>>>>> [    0.504249] nand: device found, Manufacturer ID: 0xc2, Chip ID:
> >>>>>>>>>>>> 0xf1
> >>>>>>>>>>>> [    0.510772] nand: Macronix MX30LF1G18AC
> >>>>>>>>>>>> [    0.514874] nand: 128 MiB, SLC, erase size: 128 KiB, page size:
> >>>>>>>>>>>> 2048, OOB size: 64
> >>>>>>>>>>>> [    0.522780] bcm6368_nand 10000200.nand: detected 128MiB total,
> >>>>>>>>>>>> 128KiB blocks, 2KiB pages, 16B OOB, 8-bit, BCH-4
> >>>>>>>>>>>> [    0.539687] Bad block table not found for chip 0
> >>>>>>>>>>>> [    0.550153] Bad block table not found for chip 0
> >>>>>>>>>>>> [    0.555069] Scanning device for bad blocks
> >>>>>>>>>>>> [    0.601213] CPU 1 Unable to handle kernel paging request at
> >>>>>>>>>>>> virtual
> >>>>>>>>>>>> address 10277f00, epc == 8039ce70, ra == 8016ad50
> >>>>>>>>>>>> *** Device hangs ***
> >>>>>>>>>>>>
> >>>>>>>>>>>> Enabling macronix_nand_block_protection_support() makes the device
> >>>>>>>>>>>> unable to detect the bad block table and hangs it when trying to
> >>>>>>>>>>>> scan
> >>>>>>>>>>>> for bad blocks.
> >>>>>>>>>>>
> >>>>>>>>>>> Please trace nand_macronix.c and look:
> >>>>>>>>>>> - are the get_features and set_features really supported by the
> >>>>>>>>>>>     controller driver?
> >>>>>>>>>>
> >>>>>>>>>> This is what I could find by debugging:
> >>>>>>>>>> [    0.494993] bcm6368_nand 10000200.nand: there is not valid maps for
> >>>>>>>>>> state default
> >>>>>>>>>> [    0.505375] nand: device found, Manufacturer ID: 0xc2, Chip ID:
> >>>>>>>>>> 0xf1
> >>>>>>>>>> [    0.512077] nand: Macronix MX30LF1G18AC
> >>>>>>>>>> [    0.515994] nand: 128 MiB, SLC, erase size: 128 KiB, page size:
> >>>>>>>>>> 2048, OOB size: 64
> >>>>>>>>>> [    0.523928] bcm6368_nand 10000200.nand: detected 128MiB total,
> >>>>>>>>>> 128KiB blocks, 2KiB pages, 16B OOB, 8-bit, BCH-4
> >>>>>>>>>> [    0.534415] bcm6368_nand 10000200.nand: ll_op cmd 0xa00ee
> >>>>>>>>>> [    0.539988] bcm6368_nand 10000200.nand: ll_op cmd 0x600a0
> >>>>>>>>>> [    0.545659] bcm6368_nand 10000200.nand: ll_op cmd 0x10000
> >>>>>>>>>> [    0.551214] bcm6368_nand 10000200.nand: NAND_CMD_GET_FEATURES =
> >>>>>>>>>> 0x00
> >>>>>>>>>> [    0.557843] bcm6368_nand 10000200.nand: ll_op cmd 0x10000
> >>>>>>>>>> [    0.563475] bcm6368_nand 10000200.nand: NAND_CMD_GET_FEATURES =
> >>>>>>>>>> 0x00
> >>>>>>>>>> [    0.569998] bcm6368_nand 10000200.nand: ll_op cmd 0x10000
> >>>>>>>>>> [    0.575653] bcm6368_nand 10000200.nand: NAND_CMD_GET_FEATURES =
> >>>>>>>>>> 0x00
> >>>>>>>>>> [    0.582246] bcm6368_nand 10000200.nand: ll_op cmd 0x80010000
> >>>>>>>>>> [    0.588067] bcm6368_nand 10000200.nand: NAND_CMD_GET_FEATURES =
> >>>>>>>>>> 0x00
> >>>>>>>>>> [    0.594657] nand: nand_get_features: addr=a0 subfeature_param=[00
> >>>>>>>>>> 00 00 00] -> 0
> >>>>>>>>>> [    0.602341] macronix_nand_block_protection_support:
> >>>>>>>>>> ONFI_FEATURE_ADDR_MXIC_PROTECTION=0
> >>>>>>>>>> [    0.610548] macronix_nand_block_protection_support: !=
> >>>>>>>>>> MXIC_BLOCK_PROTECTION_ALL_LOCK
> >>>>>>>>>> [    0.624760] Bad block table not found for chip 0
> >>>>>>>>>> [    0.635542] Bad block table not found for chip 0
> >>>>>>>>>> [    0.640270] Scanning device for bad blocks
> >>>>>>>>>>
> >>>>>>>>>> I don't know how to tell if get_features / set_features is really
> >>>>>>>>>> supported...
> >>>>>>>>>
> >>>>>>>>> Looks like your driver does not support exec_op but the core provides a
> >>>>>>>>> get/set_feature implementation.
> >>>>>>>>
> >>>>>>>> According to Florian, low level should be supported on brcmnand
> >>>>>>>> controllers >= 4.0
> >>>>>>>> Also:
> >>>>>>>> https://github.com/nomis/bcm963xx_4.12L.06B_consumer/blob/e2f23ddbb20bf75689372b6e6a5a0dc613f6e313/shared/opensource/include/bcm963xx/63268_map_part.h#L1597
> >>>>>>>
> >>>>>>> Just to be sure, you're using a mainline controller driver, not this
> >>>>>>> one?
> >>>>>>
> >>>>>> Yes, this was just to prove that the HW I’m using has get/set features support.
> >>>>>> I’m using OpenWrt, so it’s linux v5.15 driver.
> >>>>>>
> >>>>>>>
> >>>>>>>>>
> >>>>>>>>>>
> >>>>>>>>>>> - what is the state of the locking configuration in the chip when
> >>>>>>>>>>> you
> >>>>>>>>>>>     boot?
> >>>>>>>>>>
> >>>>>>>>>> Unlocked, I guess...
> >>>>>>>>>> How can I check that?
> >>>>>>>>>
> >>>>>>>>> It's in your dump, the chip returns 0, meaning it's all unlocked,
> >>>>>>>>> apparently.
> >>>>>>>>
> >>>>>>>> Well, I can read/write the device if block protection isn’t disabled,
> >>>>>>>> so I guess we can confirm it’s unlocked…
> >>>>>>>>
> >>>>>>>>>
> >>>>>>>>>>> - is there anything that locks the device by calling mxic_nand_lock()
> >>>>>>>>>>> ?
> >>>>>>>>>
> >>>>>>>>> So nobody locks the device I guess? Did you add traces there?
> >>>>>>>>
> >>>>>>>> It doesn’t get to the point that it enabled the lock/unlock functions
> >>>>>>>> since it fails when checking if feature is 0x38, so there’s no point
> >>>>>>>> in adding those traces…
> >>>>>>>
> >>>>>>> Right, it returns before setting these I guess.
> >>>>>>>
> >>>>>>>>
> >>>>>>>>>
> >>>>>>>>>>> - finding no bbt is one thing, hanging is another, where is it
> >>>>>>>>>>> hanging
> >>>>>>>>>>>     exactly? (offset in nand/ and line in the code)
> >>>>>>>>>>
> >>>>>>>>>> I've got no idea...
> >>>>>>>>>
> >>>>>>>>> You can use ftrace or just add printks a bit everywhere and try to get
> >>>>>>>>> closer and closer.
> >>>>>>>>
> >>>>>>>> I think that after trying to get the feature it just start reading
> >>>>>>>> nonsense from the NAND and at some point it hangs due to that garbage…
> >>>>>>>
> >>>>>>> It should refuse to mount the device somehow, but in no case the kernel
> >>>>>>> should hang.
> >>>>>>
> >>>>>> Yes, I think that this is a side effect (maybe a different bug somewhere else).
> >>>>>>
> >>>>>>>
> >>>>>>>> Is it posible that the NAND starts behaving like this after getting
> >>>>>>>> the feature due to some specific config of my device?
> >>>>>>>>
> >>>>>>>>>
> >>>>>>>>> I looked at the patch, I don't see anything strange. Besides, I have a
> >>>>>>>>> close enough datasheet and I don't see what could confuse the device.
> >>>>>>>>>
> >>>>>>>>> Are you really sure this patch is the problem? Is the WP pin wired on
> >>>>>>>>> your design?
> >>>>>>>>
> >>>>>>>> There’s no WP pin in brcmnand controllers < 7.0
> >>>>>>>
> >>>>>>> What about the chip?
> >>>>>>
> >>>>>> Maybe it has a GPIO controlling that, but I don’t have that info…
> >>>>>>
> >>>>>>>
> >>>>>>> Thanks,
> >>>>>>> Miquèl
> >>>>>>>
> >>
> >> --
> >> Florian
> >>

--
Álvaro

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