[U-Boot] [PATCH] dfu:mmc: When doing block operations, operate on the given length

[Tom Rini]

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On 03/07/2013 06:19 PM, Michael Cashwell wrote:

> I was just bitten in this area today but in a different way.
> 
> Larger than DDR? Any update larger than the default 4MB dfu_buf[] 
> fails too. (As a hack I redefined dfu_buf[] to be a cast of I
> think CONFIG_SYS_SDRAM_BASE.) But I'd love to hear more about being
> able to handle updates larger than DDR.

Yes, as another problem, we can only write in chunks of
DFU_DATA_BUF_SIZE.  And for files, since we like the infrastructure to
seek in existing files, filesystem writes need to be whole, and raw
writes can be chunks.

I've taken a patch from Pantelis Antoniou that solved half of this
problem and made it buffer filesystem writes and chunk raw writes.  It
seems to be working even but I just finished it and need to test it in
a few more places before posting.

> But on the code below, (both before and after the patch) the
> amount written is the size of the mmc partition. Why write more
> data than was received from the host? Why isn't the incoming len
> value used?

Er, that's not right.  It was before but *len is the length we've been
given.  We must make it lba_blk_size aligned, but that's typically
small (512 bytes), not the whole partition like it was before :)

> Lastly, I encountered a zero dfu->data.mmc.lba_blk_size. This gets 
> initialized in the mmc_init() path from the card meta data. But if 
> you just do "dfu mmc 0" right after booting that won't have been 
> done. The MMC controller is ready but the card structures have not 
> been read.

What platform are you looking on?  I'll go and re-produce this on mine
tomorrow, but I'd have sworn I had done dfu mmc 0 prior to any mmc
rescan/etc.

- -- 
Tom
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