armv7: disable L2 cache in cleanup_before_linux()

We were not disabling external caches before jumping
to kernel. We were flushing all caches including
external caches and disabling caches globally in
CP15 System Control register. Apparently this is not
enough.

The bootstrap loader in Linux kernel that does decompression
enables data-caches again, flush them after use and disable
them before jumping to kernel proper. However, it's not aware
of the external caches.

Since we have left external cache enabled, external cache will
get used once caches are enabled globally, but it's not flushed
because decompressor is not aware of external caches. When it
jumps to kernel with caches disabled globally, we have stale
data in the external cache and a coherency problem.

This was breaking the boot for OMAP4 with latest mainline
kernel. The solution is to disable external caches in
cleanup_before_linux(). With this fix kernel is booting again.

Cc: Albert Aribaud <albert.u.boot@aribaud.net>
Signed-off-by: Aneesh V <aneesh@ti.com>

diff --git a/arch/arm/cpu/armv7/cpu.c b/arch/arm/cpu/armv7/cpu.c
index 091e3e0842d5506b2b6351a404ee06e8cb75d594..662c4962e6e3994a66240ceb442a70cd5303a129 100644 (file)
--- a/arch/arm/cpu/armv7/cpu.c
+++ b/arch/arm/cpu/armv7/cpu.c
@@ -65,6 +65,7 @@ int cleanup_before_linux(void)
         * dcache_disable() in turn flushes the d-cache and disables MMU
         */
        dcache_disable();
+       v7_outer_cache_disable();
 
        /*
         * After D-cache is flushed and before it is disabled there may