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authorGraf Yang <graf.yang@analog.com>2009-05-07 04:09:15 +0000
committerMike Frysinger <vapier@gentoo.org>2009-06-12 06:11:41 -0400
commit5ba766752d14a741aa2d7a3c321917a310b34afb (patch)
treea97d8174cded42843de44b08d613c350b28a2729 /arch/blackfin/mach-common
parenta261eec0009b6093727fb7a59b12a10c6c981714 (diff)
Blackfin: work around anomaly 05000220
When possible, work around anomaly 05000220 (external memory is write back cached, but L2 is not cached). If not possible, detect the conditions at build time and reject any qualifying configurations. Signed-off-by: Graf Yang <graf.yang@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch/blackfin/mach-common')
-rw-r--r--arch/blackfin/mach-common/arch_checks.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/blackfin/mach-common/arch_checks.c b/arch/blackfin/mach-common/arch_checks.c
index 80d39b2f9db..da93d920716 100644
--- a/arch/blackfin/mach-common/arch_checks.c
+++ b/arch/blackfin/mach-common/arch_checks.c
@@ -71,3 +71,10 @@
#if ANOMALY_05000448
# error You are using a part with anomaly 05000448, this issue causes random memory read/write failures - that means random crashes.
#endif
+
+/* 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)))
+# error You are exposing Anomaly 220 in this config, either config L2 as Write Through, or make External Memory WB.
+#endif