Hello Thomas, On Mon, 12 Oct 2015 20:55:03 +0800, Thomas Chou <tho...@wytron.com.tw> wrote: > Hi Marek, > > On 10/12/2015 06:32 PM, Marek Vasut wrote: > > Wouldn't invalidate_dcache_range() be enough here ? You don't care about the > > data in the newly allocated area at this point I guess -- either you fill > > them > > in and then flush, for DMA from CPU to device OR you receive data from > > device > > to CPU and then you invalidate this buffer again. > > No. We cannot use invalidate cache here. This is related to cache design > of nios2, kind of direct mapped cache.
Not sure I'm getting this, so for my own education: what prevents from invalidating the cache, or IOW, what would happen if it was invalidated at this point rather than flushed? > Best regards, > Thomas Amicalement, -- Albert. _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
