[U-Boot] MMC problem in PXA270 hardware

[Vaisakh P S]

Hi,

Thanks everyone for your suggestions, I changed the width to  1 bit and it
is working right.

Regards,
Vaisakh P S


Andy Fleming-2 wrote:
> 
> On Mon, Jan 18, 2010 at 5:31 AM, Wolfgang Denk <wd at denx.de> wrote:
>> Dear Vaisakh P S,
>>
>> In message <27208581.post at talk.nabble.com> you wrote:
>>>
>>> I did some more debugging, i dumped the MBR for the sdcard, and it was
>>> proper in OS in board and PC.
>>>
>>> Here is the dump i got in OS:
>>>
>>> 00000000  fa b8 00 10 8e d0 bc 00  b0 b8 00 00 8e d8 8e c0
>>> 00000010  fb be 00 7c bf 00 06 b9  00 02 f3 a4 ea 21 06 00
>>> 00000020  00 be be 07 38 04 75 0b  83 c6 10 81 fe fe 07 75
>> ...
>>> But in Uboot, the dump which i got MBR read was the following
>>>
>>>  0xea 0xa8 0x0 0x0 0x8e 0xc0 0xac 0x0 0xa0 0xa8 0x0 0x0 0x8e 0xc8 0x8e
>>> 0xc0
>>> 0xea 0xae 0x0 0x6c 0xae 0x0 0x6 0xa8 0x0 0x2 0xe2 0xa4 0xea 0x20 0x6 0x0
>>> 0x0
>>> 0xae 0xae 0x6 0x28 0x4 0x64 0xa 0x82 0xc6 0x0 0x80 0xee 0xee 0x6 0x64
>>> 0xe2
>>
>> Seems something is eating the 0x10 bit, so 0xFA becomes 0xEA, etc.
> 
> 
> Actually, it looks like you're losing the 0x01 bit, too.  Maybe the
> u-boot driver is somehow mis-detecting how many bits are connected?
> The card should be saying which bit-widths it supports, and the host
> controller should be properly reporting which widths it supports.  I'm
> not familiar with the pxa270's driver, but it might be possible to
> modify it to only do 1-bit transfers, and see if that works.
> 
> Andy
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> 

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