[U-Boot-Users] MMC Card Problems with U-Boot 1.1.6

[Pete MacKay]

What kind of MMC cards are you using?  We're in the same boat and haven't
been able to initialize Patriot 512MB cards.  I've rewritten/added to the
code for SD 2.0 (added 'sdinit' and an sd interface) and am seeing portions
of the data dropped when I read blocks from a 512MB SanDisk SD 2.0 card. 
We're clocking at 10 MHz, running a 312 MHz PXA-270 (with turbo mode), and
both cards work fine under our 2.6.18 kernel.

You can define DEBUG and MMC_DEBUG and rebuild u-boot to look at the command
outputs.  Our MMC_STAT register reads 0x2140 on successful commands and
0x2142 on timeouts.

Has anyone been able to copy file systems correctly with MMC or SD on the
PXA-270?  I'm not convinced this ever worked.


sgobien wrote:
> 
> I’m using U-Boot 1.1.6, and I’m having problems with the MMC support.  My 
> board is a custom board based on the PXA270 CPU, with 128MB of SDRAM and
> 64MB 
> of internal flash.  Using the loadb command, I can successfully copy my 
> filesystem to the SDRAM. Then, I use the cp.b command to transfer it to
> flash. 
> Everything works properly and the filesystem transfers without any
> problem.  
> 
> Next, I tried using the fatload command to copy the same exact filesystem
> from 
> the MMC card to SDRAM.  U-Boot claims that the entire file was copied 
> correctly as indicated by the filesize environment variable.  However,
> once I 
> move the filesystem to flash, it ends up corrupted in the flash.  I can
> only 
> conclude that the fatload command has incorrectly copied the filesystem
> from 
> the MMC card to SDRAM.  
> 
> Has anybody had trouble using MMC cards and the fat commands with a PXA270 
> CPU?  I don’t receive any error messages, so I’m not really sure where to
> look.
> 
> Thanks in advance for any guidance.
> 
> Steve
> 

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