I partially solved the problem. The erase did work, the problem was that the standard v2 read function uses memcpy to 
transfer the data, which does 32 bit accesses. This board doesn't seem to like that, or the interface/the flash chip 
must be configured in some way, I don't know, anyhow I wrote my own v2read callout and supplied a 16 bit memcpy function
. Now I can read from the device, It recognizes the partition (I constructed an EFS with system builder and burnt it to 
flash with Lauterbach debugger), I can run programs from the partition.

However, I am still unable to write anything to the device. I use the v2write callout f3s_aCFI_v2write, which seems to 
be the one for all modern chips (is this one??), but I always get this error message: 

[code]
amd_poll: 163 program error
(devf  t2::f3s_aCFI_v2write:233) over poll waiting for write completion
[/code]

It seems that it is trying to read back the writtten value, which doesn't succeed. readmem, as I understand, is a 
function pointer assigned at startup, so it should call my own 16bit v2read function, or not??

Any ideas appriciated, thank you.

Regards,
Albrecht

> Hello,
> 
> I am writing a FFS3 NOR flash driver for an i.MX31 based board. The device is 
> a Spansion S71WS128PC0HF3 burst-mode NOR Flash (16MB, 16 bit bus width) 
> connected to CS5 of the WEIM. I can boot the system from this flash and I 
> created an EFS and burnt it into the flash via JTAG debugger. I wrote a small 
> test program that simply maps in the base address and scans for the 'QSSL' 
> signature of the partition - it finds it at the correct address. However, when
>  I run my flash driver it doesn't recognise it.
> 
> The auto-detect of the device works ((devf  t1::f3s_flash_probe:248) chip 
> total = 1, bus_width = 2, interleave = 1)
> Erasing via flashctl works. 
> flashctl -p/dev/fs0 -o8M -l8M -e -v
> Erasing device /dev/fs0
> ................................................................
> (devf  t2::f3s_table_find:66) fs0p0 raw U: 80
> # 
> Formatting fails, though:
> # flashctl -p/dev/fs0p0 -o8M -l8M -f -v
> Formatting device /dev/fs0p0
> amd_poll: 163 program error
> (devf  t2::amd_v2wordwrite:113) over poll waiting for write completion
> (devf  t2::f3s_ext_write:197) fs0p0 bad H[00] P[40] # 000010
> DCMD_F3S_FORMAT failed (errno 5)
> flashctl: format failed
> 
> I tried various write() functions of the MTD library but always the same. 
> Maybe the writing works but reading doesn't? I supply NULL for the v2read 
> callout, so it should use memcpy(), which works, as seen from my test program.
> 
> 
> Any ideas greatly appriciated. Thank you.
> 
> -Albrecht

hello , Gunter Geigemueller 
      I met the same problem just the same as you.I can erase my flash use flashctl but can't format it, how did you fix
 it? Thank you very much.

 Formatting device /dev/fs0p0
amd_poll: 163 program error
(devf  t2::amd_v2wordwrite:113) over poll waiting for write completion
(devf  t2::f3s_ext_write:197) fs0p0 bad H[00] P[40] # 000010
DCMD_F3S_FORMAT failed (errno 5)
 flashctl: format failed