"Read-only file system" error while writing

[Gordon J Milne]

Hi

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 
same result.

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?

Gordon