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| author | Kyösti Mälkki <kyosti.malkki@gmail.com> | 2016-06-19 20:38:41 +0300 |
|---|---|---|
| committer | Kyösti Mälkki <kyosti.malkki@gmail.com> | 2016-06-22 11:03:42 +0200 |
| commit | 65cc526f6f47755b4492cd9fc2134fb2dd067e90 (patch) | |
| tree | 9b7357287b96f73a762592ccc8b7d2153eff1d46 /src/cpu/amd/car | |
| parent | c5400efc11e181caf0babaa6001de18e3f23c6af (diff) | |
Ignore RAMTOP for MTRRs
Without RELOCATABLE_RAMSTAGE have WB cache large enough
to cover the greatest ramstage needs, as there is no benefit
of trying to accurately match the actual need. Choose
this to be bottom 16MiB.
With RELOCATABLE_RAMSTAGE write-back cache of low ram is
only useful for bottom 1MiB of RAM as a small part of this gets used
during SMP initialisation before proper MTRR setup.
Change-Id: Icd5f8461f81ed0e671130f1142641a48d1304f30
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/15249
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Diffstat (limited to 'src/cpu/amd/car')
| -rw-r--r-- | src/cpu/amd/car/post_cache_as_ram.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/src/cpu/amd/car/post_cache_as_ram.c b/src/cpu/amd/car/post_cache_as_ram.c index 0a59696b56..1880ccb441 100644 --- a/src/cpu/amd/car/post_cache_as_ram.c +++ b/src/cpu/amd/car/post_cache_as_ram.c @@ -175,8 +175,8 @@ void cache_as_ram_new_stack (void) disable_cache_as_ram_bsp(); disable_cache(); - /* Enable cached access to RAM in the range 1M to CONFIG_RAMTOP */ - set_var_mtrr(0, 0x00000000, CONFIG_RAMTOP, MTRR_TYPE_WRBACK); + /* Enable cached access to RAM in the range 0M to CACHE_TMP_RAMTOP */ + set_var_mtrr(0, 0x00000000, CACHE_TMP_RAMTOP, MTRR_TYPE_WRBACK); enable_cache(); if (acpi_is_wakeup_s3()) { |