MTD do_write_oneword(): software timeout

[Burch, John T.]

I'm using kernel 2.6.8 and am having problems with jffs2/mtd.
Frequently, though I'm not sure why, file writes fail as
shown in the debug output below (CONFIG_MTD_DEBUG_VERBOSE=3).
The failure appears to be as a result of do_write_oneword().
The error sometimes occurs with timeouts; other times it
does not.  Another curiousity is that the failures appear
to occur when a do_write_oneword() occurs at an
address that was just written (indicated below with '**').
Is this normal jffs2 behaviour, since it seems that the
first write is always with data=0x785e?

All works well with previous code running kernel 2.4.17, so
I know it's not a problem with the flash itself.  I have seen
some discussion of the timeout value in do_write_oneword()
not accounting for HZ of < 1000, but it appears that change
is already in the 2.6.8 version of cfi_cmdset_0002.c.

One other thing that may or may not be related is the
message at kernel startup (see below) about disabling
erase-suspend-program code.

Does anyone have any input on this do_write_oneword()
failure?

Thanks,
John


# cp /etc/dummy_file t1
MTD do_write_buffer(): WRITE 0x00c712c8(0x00001985)
MTD do_write_buffer(): WRITE 0x00c712e0(0x00000000)
MTD do_write_buffer(): WRITE 0x00c71300(0x00000000)
MTD do_write_buffer(): WRITE 0x00c7032c(0x00001985)
MTD do_write_buffer(): WRITE 0x00c7130c(0x00001985)
MTD do_write_buffer(): WRITE 0x00c71320(0x00000000)
MTD do_write_buffer(): WRITE 0x00c71340(0x00000000)
MTD do_write_buffer(): WRITE 0x00c71350(0x0000785e)**
MTD do_write_buffer(): WRITE 0x00c71360(0x000031e4)
MTD do_write_buffer(): WRITE 0x00c71380(0x00000966)
MTD do_write_buffer(): WRITE 0x00c713a0(0x0000c500)
MTD do_write_oneword(): WRITE 0x00c71350(0x0000165e)**
MTD do_write_oneword(): software timeout
MTD do_write_oneword(): software timeout
MTD do_write_oneword(): software timeout
MTD do_write_oneword(): software timeout
Write of 175 bytes at 0x0003130c failed. returned -5, retlen 174
MTD do_write_buffer(): WRITE 0x00c713bc(0x00001985)
MTD do_write_buffer(): WRITE 0x00c713c0(0x00000000)
MTD do_write_buffer(): WRITE 0x00c713e0(0x0000386d)
MTD do_write_buffer(): WRITE 0x00c71400(0x0000785e)**
MTD do_write_buffer(): WRITE 0x00c71420(0x00005200)
MTD do_write_buffer(): WRITE 0x00c71440(0x00004a6a)
MTD do_write_buffer(): WRITE 0x00c71460(0x0000a572)
MTD do_write_oneword(): WRITE 0x00c71400(0x0000165e)**
Write of 175 bytes at 0x000313bc failed. returned -5, retlen 174
cp: unable to close `t1': Input/output error

**snippet of kernel startup...
Physically mapped flash: Found 1 x16 devices at 0x0 in 16-bit bank
 Amd/Fujitsu Extended Query Table at 0x0040
Physically mapped flash: CFI does not contain boot bank location.
Assuming top.
number of CFI chips: 1
Using buffer write method
cfi_cmdset_0002: Disabling erase-suspend-program due to code brokenness.
mtd: Giving out device 0 to Physically mapped flash
physmap flash device: 0x1000000 at 0xbf000000
Creating 8 MTD partitions on "Physically mapped flash":
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