> -----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@xxxxxxxxxxxxxxx; Shilimkar, Santosh; > pierre@xxxxxxxxx; saeed bishara; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx > 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 -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
