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x86: Set up the MTRR for SDRAM

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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>
This commit is contained in:
Simon Glass 2019-12-06 21:42:12 -07:00 committed by Bin Meng
parent ea4e97a511
commit 4279110018
1 changed files with 5 additions and 0 deletions
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5
arch/x86/lib/fsp/fsp_dram.c
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@ -9,6 +9,7 @@
#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;
@ -61,6 +62,8 @@ 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);
}
@ -69,6 +72,8 @@ 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;
}