[U-Boot-Users] Problem with flash cfi legacy mode

[Michael Schwingen]

Tor Krill wrote:
> Im working on adding support for our board to u-boot.
>
> I use legacy flash mode for our boot-flash. I however have some problems
> with it.
>
> When using jedec probe to identify our flash. Im unable to do so with our
> 16bit device-id. In my opinion it seems like this actually wont work(?)
>
> cmdset_amd_read_jedec_ids uses _one_ flash_read_uchar call to read out
> the device id(, if its not an amd extended one). The only way i could
> get this to work with our flash was to only put the lower 8bit in the
> dev_id field when adding an entry to the jedec_table.
>   
Hm - right. You are probably the first one to use that code on a 16-bit 
non-CFI flash - for 16-bit flashs, the read will need to be changed, but 
I am not sure how exactly - I think we may need separate code depending 
on info->chipwidth, because 8-bit flashs only have an 8-bit ID.
> Further on it seems like CFI_CMDSET_AMD_LEGACY is unsupported in
> flash_write_cfibuffer.
>   
Right. Setting info->buffer_size = 1 in jedec_flash.c/fill_info() should 
make sure that part of code is never executed.

cu
Michael