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Blackfin: decouple unrelated cache settings to get exact behavior

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The current cache options don't really represent the hardware features.
They end up setting different aspects of the hardware so that the end
result is to turn on/off the cache.  Unfortunately, when we hit cache
problems with the hardware, it's difficult to test different settings to
root cause the problem.  The current settings also don't cleanly allow for
different caching behaviors with different regions of memory.

So split the configure options such that they properly reflect the settings
that are applied to the hardware.

Signed-off-by: Jie Zhang <jie.zhang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Jie Zhang
2009-06-16 09:48:33 +00:00
committed by Mike Frysinger
parent 7c039a90f0
commit 41ba653f24
11 changed files with 212 additions and 117 deletions
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4
arch/blackfin/mach-common/arch_checks.c
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@@ -74,7 +74,7 @@
/* if 220 exists, can not set External Memory WB and L2 not_cached, either External Memory not_cached and L2 WB */
#if ANOMALY_05000220 && \
((defined(CONFIG_BFIN_WB) && defined(CONFIG_BFIN_L2_NOT_CACHED)) || \
(!defined(CONFIG_BFIN_DCACHE) && defined(CONFIG_BFIN_L2_WB)))
((defined(CONFIG_BFIN_EXTMEM_WRITEBACK) && !defined(CONFIG_BFIN_L2_DCACHEABLE)) || \
(!defined(CONFIG_BFIN_EXTMEM_DCACHEABLE) && defined(CONFIG_BFIN_L2_WRITEBACK)))
# error You are exposing Anomaly 220 in this config, either config L2 as Write Through, or make External Memory WB.
#endif