Problem with finding flash device AM29F040B

[Thayne Harbaugh]

On Sun, 2003-07-13 at 20:02, Dmytro Bablinyuk wrote:
> I have a MPC866ADS out of the box board and I got linux running from 
> ramdisk.
> But I could not get flash (AM29F040B) working with 2.4.21 kernel.
> I tried to specify phys map but I still have:

I haven't ever used phys map - it may work.  You may need to probe the
chip before it can be used by phys map.

> 
> physmap flash device: 200000 at 2800000
> CFI: Found no Physically mapped flash device at location zero
> kmod: failed to exec /sbin/modprobe -s -k jedec_probe, errno = 2
> kmod: failed to exec /sbin/modprobe -s -k map_rom, errno = 2

Aren't these obvious errors WRT the config options you list below?

> Could somebody please give me a clue about this.
> Thank you in advance for any help.
> 
> Some details of my kernel config:
> 
> #
> # Mapping drivers for chip access
> #
> CONFIG_MTD_PHYSMAP=y
> CONFIG_MTD_PHYSMAP_START=2800000
> CONFIG_MTD_PHYSMAP_LEN=200000
> CONFIG_MTD_PHYSMAP_BUSWIDTH=2
> # CONFIG_MTD_TQM8XXL is not set
> # CONFIG_MTD_RPXLITE is not set
> # CONFIG_MTD_MBX860 is not set
> # CONFIG_MTD_DBOX2 is not set
> # CONFIG_MTD_CFI_FLAGADM is not set
> # CONFIG_MTD_REDWOOD is not set
> # CONFIG_MTD_PCI is not set
> # CONFIG_MTD_PCMCIA is not set
> 
> #
> # RAM/ROM/Flash chip drivers
> #
> CONFIG_MTD_CFI=y
> # CONFIG_MTD_JEDECPROBE is not set

I suggest turning this on.

> CONFIG_MTD_GEN_PROBE=y
> # CONFIG_MTD_CFI_ADV_OPTIONS is not set
> # CONFIG_MTD_CFI_INTELEXT is not set
> # CONFIG_MTD_CFI_AMDSTD is not set
> # CONFIG_MTD_CFI_STAA is not set
> # CONFIG_MTD_RAM is not set
> # CONFIG_MTD_ROM is not set
> # CONFIG_MTD_ABSENT is not set
> CONFIG_MTD_OBSOLETE_CHIPS=y
> CONFIG_MTD_AMDSTD=y
> 
> #
> # Memory Technology Devices (MTD)
> #
> CONFIG_MTD=y
> # CONFIG_MTD_DEBUG is not set

CONFIG_MTD_DEBUG is also helpful - turni it on and set
CONFIG_MTD_DEBUG_VERBOSE to 3.  The kernel output might be useful to
figure out where things are failing (this can be turned off once
everything is working).

> CONFIG_MTD_PARTITIONS=y
> # CONFIG_MTD_CONCAT is not set
> # CONFIG_MTD_REDBOOT_PARTS is not set
> # CONFIG_MTD_CMDLINE_PARTS is not set
> CONFIG_MTD_CHAR=y
> CONFIG_MTD_BLOCK=y
> # CONFIG_FTL is not set
> # CONFIG_NFTL is not set

-- 
Thayne Harbaugh
Linux Networx
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