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Blackfin: allow cache funcs to be in L1 for IFLUSH Anomaly 05000491

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Anomaly 05000491 says that IFLUSH cannot have certain types of memory
stalls triggered before it has completed in order to function correctly.
One such condition is that it be in L1 instruction.  So add a config
option to move it there, default it to on, and throw up a warning when
it is turned off and this anomaly exists.

Since the anomaly should be worked around, we can drop the older method
of calling IFLUSH multiple times.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
This commit is contained in:
Mike Frysinger
2010-05-27 22:46:46 +00:00
parent dc7101bbae
commit 74181295fb
3 changed files with 20 additions and 11 deletions
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4
arch/blackfin/mach-common/arch_checks.c
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@@ -60,3 +60,7 @@
(defined(CONFIG_BFIN_EXTMEM_WRITEBACK) || defined(CONFIG_BFIN_L2_WRITEBACK))
# error "Anomaly 05000220 does not allow you to use Write Back cache with L2 or External Memory"
#endif
#if ANOMALY_05000491 && !defined(CONFIG_CACHE_FLUSH_L1)
# error You need IFLUSH in L1 inst while Anomaly 05000491 applies
#endif