Highmem issues with MMC filesystem

[Shilimkar, Santosh]

> -----Original Message-----
> From: V, Hemanth
> Sent: Friday, March 19, 2010 7:59 PM
> To: Nicolas Pitre
> Cc: Jamie Lokier; Russell King - ARM Linux; linux-mmc at vger.kernel.org; Shilimkar, Santosh;
> pierre at ossman.eu; saeed bishara; linux-arm-kernel at lists.infradead.org
> Subject: Re: Highmem issues with MMC filesystem
> 
> > 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.
> 
Since the cache_flush is helping and we are talking about DMA_FROM_DEVICE case,
Russells recent DMA mapping series does have fix for this.

Do you have Russell's DMA mapping series integrated in your kernel you are trying ?
It's already in the 2.6.34-rc1

Regards,
Santosh