Malta boards may be used with cores which support L2 caches, however U-boot does not yet support L2 cache for MIPS. Thus for the moment we'll disable L2 caches by setting the L2B bit in Config2. This is specific to MTI/Imagination MIPS cores which is why this is done for the Malta board rather than generically.
Signed-off-by: Paul Burton paul.burton@imgtec.com --- Changes in v3: - rebase atop master
Changes in v2: - rebased after malta moved to board/imgtec/malta --- board/imgtec/malta/lowlevel_init.S | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/board/imgtec/malta/lowlevel_init.S b/board/imgtec/malta/lowlevel_init.S index 1af34f1..ae09c27 100644 --- a/board/imgtec/malta/lowlevel_init.S +++ b/board/imgtec/malta/lowlevel_init.S @@ -12,6 +12,7 @@ #include <asm/addrspace.h> #include <asm/regdef.h> #include <asm/malta.h> +#include <asm/mipsregs.h>
#ifdef CONFIG_SYS_BIG_ENDIAN #define CPU_TO_GT32(_x) ((_x)) @@ -27,6 +28,12 @@
.globl lowlevel_init lowlevel_init: + /* disable any L2 cache for now */ + sync + mfc0 t0, CP0_CONFIG, 2 + ori t0, t0, 0x1 << 12 + mtc0 t0, CP0_CONFIG, 2 + /* detect the core card */ li t0, KSEG1ADDR(MALTA_REVISION) lw t0, 0(t0)