Dear Mike Frysinger,
On Sunday 01 April 2012 17:00:56 Marek Vasut wrote:
Dear Mike Frysinger,
On Sunday 01 April 2012 09:22:59 Stefano Babic wrote:
If the range passed to flush_cache is not multiple of ARCH_DMA_MINALIGN, a warning due to mislaignment is printed. Detected with fec_mxc, mx35 boards:
CACHE: Misaligned operation at range [80800000, 8083c310]
warning on flushing is broken. the arch/arm/cpu/arm926ejs/cache.c code should probably be fixed instead.
Why exactly?
the flush isn't harmful (ignoring the fact that a few extra bytes might get written back to external memory), and the data isn't evicted from cache. after all, we aren't talking about invalidate here, we're talking about flush.
Right ... and can you be sure nothing important is overwritten in RAM?
plus, no other arch (linux or u-boot) does this.
so the better question is, why exactly should you be warning ? you should provide justification when doing something unusual ...
Because you can destroy data in DRAM that arrived there by DMA transfer for example?
-mike
Best regards, Marek Vasut