fsl mx28evk spi nor probe problem

Hi Fabio

I just tried spi nor on fsl m28evk and see :

MX28EVK U-Boot > sf probe
SF: Unsupported manufacturer ff
Failed to initialize SPI flash at 2:0

This is with U-Boot 2012.10 and I included
#define CONFIG_SPI_FLASH_WINBOND in mx28evk.h.

I thought that used to work. I am not sure if
there could be anything wrong with this board here so I would read FF. Can you please give a try if spi nor probe is working fine and if you would have any suggestions what might be wrong in my case. Thanks.

-- sinan

Hi Sinan,

Which SPI flash have you populated into mx28evk?

Regards,

Fabio Estevam

Hi Fabio, thanks for your reply. I guess I got
blindfolded by another winbond W25X80 populated board that I used to access and now an unrelated winbond chip on this board. But this board was not populated therefore the FF readings as ID. Marek helped me to figure out and forwarded your message.

I find it interesting though that an unpopulated chip
returns FFs instead of causing a timeout etc. Probing another (presumably non-existing) bus/cs value (e.g. 3:0) causes a timeout. I don't know enough about this at this point why we read FFs quietly in an unpopulated case but I would like to dig a bit more.

Thanks much for the pointers you provided.

-- sinan