Problem with Micron 256 MB NAND on 440EPx

[Andrew E. Mileski]

Andrew E. Mileski wrote:
> I'm looking for some pointers in the right direction with this problem
> I'm having with Micron 256 MB NAND part MT29F2G08AACWP:C with a JFFS2
> filesystem on a AMCC PowerPC 440EPx board using the NDFC driver.
> 
snip
> 
> Write verify error (ECC correction failed) at 0e480000. Wrote:
> 00000000: 19 85 e0 02 00 00 04 44 c0 83 e7 3a 00 00 00 03
> ...
> Read back:
> 00000000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> 00000010: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> 00000020: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> 00000030: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
> 00000040: 19 85 e0 02 00 00 04 44 c0 83 e7 3a 00 00 00 03
> 
> Notice that the data appears to be "offset" by 64 bytes, which just
> happens to be the size of the OOB, but that could be a coincidence.

I've now verified with a logic analyzer that the NFREN strobe is active 
during when NFRDYBSY is low (NAND chip is busy), and latching bogus data 
as a result (the bus has pull-ups so 0xff).

I've verified the pin is connected, and I have seen transitions on it 
through the PPC register.

Any suggestions on what I might be missing still?

Thanks.

-- 
Andrew E. Mileski