[U-Boot] [PATCH 2/2] mmc: tegra: invalidate complete cachelines

[Stephen Warren]

On 11/02/2012 03:28 PM, Marek Vasut wrote:
> Dear Stephen Warren,
> 
>> On 11/02/2012 02:38 PM, Marek Vasut wrote:
...
>>> Dumb question -- might be unrelated. Does the tegra mmc driver do DMA?
>>> And if so, what happens if you do raw read to unaligned address (aka.
>>> how come you don't need the bounce buffer)?
>>
>> Yes, it does DMA, I believe. (At least if it doesn't, I have no idea why
>> the driver is flushing caches!)
>>
>> I guess we only support the use of aligned addresses, so e.g. the
>> following would work:
>>
>> ext2load mmc 0:1 0x00100000 /file
>>
>> but the following wouldn't:
>>
>> ext2load mmc 0:1 0x00100004 /file
>>
>> which while I suppose it is an artificial restriction, hasn't been an
>> issue in practice.
> 
> Then just enable the bounce buffer and it will work ;-)

You suggested that last time, and it made no difference then... In fact,
the config option you mentioned isn't used anywhere in the srouce tree
except adding bouncebuf.o into the build right now; which config option
do you think I should use?