"Read-only file system" error while writing
Gordon J Milne
gordon at bluewatersys.com
Wed May 21 07:33:32 EDT 2003
David Woodhouse wrote:
> gromit1463 at mailworks.org said:
>>When I write to the chips using either cat, dd, stdout redirection, or
>>cp, the CFI driver complains of attempting to write to a "Read-only
>>file system", even after unlocking all blocks in the partition and
>>erasing the partition. I can mount /dev/mtdblock*, but mount
>>complains and I still can't put anything into the mounted partition.
>>do_write_buffer() in cfi_cmdset_0001.c is returning the error (EROFS).
> The only case in which do_write_buffer() should return -EROFS is if the
> status bit is set which means that the block in question was locked. Try
> using the MEMUNLOCK ioctl to unlock it?
I am having exactly the same problem with the same ST part (M28W320CB). I am
running uClinux (based on Linux 2.4.20). I modified the do_write_buffer()
code to print out the status value that was read back. The value is 0xffff.
It seems a bit strange to me that ALL the bist should be 1s.
I have tried using "unlock" to unlock the device (/dev/mtd3) but I get the
The device (1f:03) is the root device and it has been remounted rw. I
verified this by checking /proc/mounts - everything was rw, as expected. My
system successfully boots and I can execute commands. It is just the
filesystem writes that are not working for me.
Any further ideas?
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