Set up MTRRs for the FSP SDRAM regions to improve performance.
Signed-off-by: Simon Glass sjg@chromium.org Reviewed-by: Bin Meng bmeng.cn@gmail.com ---
Changes in v5: - Fix FST typo
Changes in v4: None Changes in v3: - Move mtrr_add_request() call into this patch
Changes in v2: None
arch/x86/lib/fsp/fsp_dram.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/arch/x86/lib/fsp/fsp_dram.c b/arch/x86/lib/fsp/fsp_dram.c index 3ede9b73fe..9ca898a0cd 100644 --- a/arch/x86/lib/fsp/fsp_dram.c +++ b/arch/x86/lib/fsp/fsp_dram.c @@ -8,6 +8,7 @@ #include <asm/fsp/fsp_support.h> #include <asm/e820.h> #include <asm/mrccache.h> +#include <asm/mtrr.h> #include <asm/post.h>
DECLARE_GLOBAL_DATA_PTR; @@ -60,6 +61,8 @@ int dram_init_banksize(void)
gd->bd->bi_dram[bank].start = res_desc->phys_start; gd->bd->bi_dram[bank].size = res_desc->len; + mtrr_add_request(MTRR_TYPE_WRBACK, res_desc->phys_start, + res_desc->len); log_debug("ram %llx %llx\n", gd->bd->bi_dram[bank].start, gd->bd->bi_dram[bank].size); } @@ -68,6 +71,8 @@ int dram_init_banksize(void) gd->bd->bi_dram[0].start = 0; gd->bd->bi_dram[0].size = low_end;
+ mtrr_add_request(MTRR_TYPE_WRBACK, 0, low_end); + return 0; }