[U-Boot-Users] [PATCH 05/08]: mpc7448hpc2 board flash support

[Wolfgang Denk]

In message <7EA18FDD2DC2154AA3BD6D2F22A62A0E0D2F42 at zch01exm23.fsl.freescale.net> you wrote:
> 
> mpc7448 processor is BIG ENDIAN, while the tsi108 bridge connects the
> flash chip  
> by little ENDIA mode.  When I set __LITTLE_ENDIA in the cfi_flash
> driver, everything seems
> OK, but  the written bytes are swapped (see the following log). 
> Now, It seems that if I define CFG_FLASH_USE_BUFFER_WRITE in my config
> file, this issue 
> can be solved. I will do more test on my board.
> While, how can I set __LITTLE_ENDIA mode for cfi_driver file in a BIG
> ENDIA system?

Please check your keyboard; the 'N' key seems to fail quite often.

> FLASH: ## Unknown FLASH on Bank 1 - Size = 0x00000000 = 0 MB
> 16 MB
...
> => fli
> 
> Bank # 1: CFI conformant FLASH (32 x 16)  Size: 16 MB in 128 Sectors
>  Erase timeout 16384 ms, write timeout 1 ms, buffer write timeout 5 ms,
> buffer size 32

Stop. What's this. First we see a report of "Unknown  FLASH  on  Bank
1",  and  that  the size has been set to 0, and here we get different
information?

>   Sector Start Addresses:
>     FF000000      FF020000      FF040000      FF060000      FF080000
...
>     FFFA0000      FFFC0000      FFFE0000
> 
> Bank # 2: missing or unknown FLASH type

And what's this about Bank # 2???

This seems to be a bug. Please fix this first.


> => md ff000000
> ff000000: 27051956 552d426f 6f742031 2e312e34    '..VU-Boot 1.1.4
> ff000010: 2d673230 38653063 38312d64 69727479    -g208e0c81-dirty
...
> => cp.b ff000000 fff80000 20000
> Copy to Flash... done

So you are copying some area within the *same*  memory  device  (your
flash memory)...

> => md fff80000
> fff80000: 56190527 6f422d55 3120746f 342e312e    V..'oB-U1 to4.1.
> fff80010: 3032672d 63306538 642d3138 79747269    02g-c0e8d-18ytri

You read from memory, write to the same memory device, and  read  the
written  data  back from the same memory device, and find the data to
be swapped?

That would mean that reading and writing memory  use  different  byte
order. If this is true, then you're screwed.

Best regards,

Wolfgang Denk

-- 
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