[U-Boot] [PATCH RFC 1/2] flush cache for arm926

[Alessandro Rubini]

This simple adds the cache flush for arm926. Most likely
the same works for other families, like arm920t, but I didn't
check as this is currently just an RFC.

Signed-off-by: Alessandro Rubini <rubini at gnudd.com>
---
 lib_arm/cache.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/lib_arm/cache.c b/lib_arm/cache.c
index 61ee9d3..b36fd24 100644
--- a/lib_arm/cache.c
+++ b/lib_arm/cache.c
@@ -32,5 +32,11 @@ void  flush_cache (unsigned long dummy1, unsigned long dummy2)
 
 	arm1136_cache_flush();
 #endif
+#ifdef CONFIG_ARM926EJS
+	/* test and clean, page 2-23 of arm926ejs manual */
+	asm("0: mrc p15, 0, r15, c7, c10, 3\n\t" "bne 0b\n" : : : "memory");
+	/* disable write buffer as well (page 2-22) */
+	asm("mcr p15, 0, %0, c7, c10, 4" : : "r" (0));
+#endif
 	return;
 }
-- 
1.6.0.2