Highmem issues with MMC filesystem

[Hemanth V]

> Nicolas Pitre wrote:
>
> Furthermore the same highmem issues were reported to occur on an OMAP
> system with the filesystem on a MMC card i.e. different CPU manufacturer
> with a different block device driver.
>
> So the issue really seems to be about ARMv5 (works) vs ARMv6 (doesn't
> work), which makes some sense given the huge difference between both
> cache models.
>

Adding a cache flush before starting MMC DMA solves the problem for me,
so dumping cache contents can give some clues to the problem. Does anyone
have access to a debugger which can dump cache contents.

Thanks
Hemanth