[U-Boot] [PATCH v3] mtd: cfi_flash: Fix CFI flash driver for 8-bit bus support

[Stefan Roese]

On 01.03.2013 12:23, Jagannadha Sutradharudu Teki wrote:
> This commit is based on that patch from aaron.williams at caviumnetworks.com
> with same commit along with few code cleanup changes.
> 
> This patch corrects the addresses used when working with Spansion/AMD FLASH chips.
> Addressing for 8 and 16 bits is almost identical except in the 16-bit case the
> LSB of the address is always 0.  The confusion arose because the addresses
> in the datasheet for 16-bit mode are word addresses but this code assumed it was
> byte addresses.
> 
> I have only been able to test this on our Octeon boards which use either an 8-bit
> or 16-bit bus.  I have not tested the case where there's an 8-bit part on a 16-bit
> bus.
> 
> This patch also adds some delays as suggested by Spansion.
> 
> If a part can be both 8 and 16-bits, it forces it to work in 8-bit mode if an
> 8-bit bus is detected.
> 
> Before this fix:
> ---------------
> Bank # 1: CFI conformant flash (8 x 8)  Size: 64 MB in 512 Sectors
>   AMD Standard command set, Manufacturer ID: 0xFF, Device ID: 0xFF
>   Erase timeout: 4096 ms, write timeout: 2 ms
>   Buffer write timeout: 5 ms, buffer size: 1024 bytes
> 
> After this fix:
> --------------
> Bank # 1: CFI conformant flash (8 x 8)  Size: 64 MB in 512 Sectors
>   AMD Standard command set, Manufacturer ID: 0x89, Device ID: 0x7E2301
>   Erase timeout: 4096 ms, write timeout: 2 ms
>   Buffer write timeout: 5 ms, buffer size: 1024 bytes
> 
> Tested on: 256M29EW, 512M29EW flashes.
> 
> Signed-off-by: Jagannadha Sutradharudu Teki <jaganna at xilinx.com>
> Tested-by: Jagannadha Sutradharudu Teki <jaganna at xilinx.com>

Please preserve the previous commit text and the S-o-b lines for patch
authorship. And add your comments with the additions to this text. And
finally your S-o-b as well of course.

Thanks,
Stefan