diff options
| author | Simon Glass <sjg@chromium.org> | 2025-03-15 14:25:47 +0000 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2025-04-03 11:41:55 -0600 |
| commit | 790baef3b93e0f194bca266f32f620898b84951f (patch) | |
| tree | 6678a57054a32b6954267cb4ac8f815765de06e7 | |
| parent | 66c9ade35b520510856511ed388aee138c5eb388 (diff) | |
x86: emulation: Set an MTRR for the RAM
QEMU likes to have an MTRR set up, just like real machines. Add an MTRR
which covers the total RAM size.
This does nothing on machines without MTRRs.
Signed-off-by: Simon Glass <sjg@chromium.org>
| -rw-r--r-- | arch/x86/cpu/qemu/dram.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/x86/cpu/qemu/dram.c b/arch/x86/cpu/qemu/dram.c index 62a301c0fd3..ba3638e6acc 100644 --- a/arch/x86/cpu/qemu/dram.c +++ b/arch/x86/cpu/qemu/dram.c @@ -4,7 +4,9 @@ */ #include <init.h> +#include <spl.h> #include <asm/global_data.h> +#include <asm/mtrr.h> #include <asm/post.h> #include <asm/arch/qemu.h> #include <linux/sizes.h> @@ -44,6 +46,22 @@ int dram_init(void) gd->ram_size += qemu_get_high_memory_size(); post_code(POST_DRAM); + if (xpl_phase() == PHASE_BOARD_F) { + u64 total = gd->ram_size; + int ret; + + if (total > SZ_2G + SZ_1G) + total += SZ_1G; + ret = mtrr_add_request(MTRR_TYPE_WRBACK, 0, total); + if (ret != -ENOSYS) { + if (ret) + return log_msg_ret("mta", ret); + ret = mtrr_commit(false); + if (ret) + return log_msg_ret("mtc", ret); + } + } + return 0; } |