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nyan: big: Check dram_end when setting up caching in ROM stage. 

When setting up caching on nyan and big, we would set the region after DRAM to
the end of the address space as uncachable. DRAM may actually extend beyond
the end of the address space, so that may result in address aliasing or other
problems. This change adds a check to make sure there's actually space there.

BUG=None
TEST=Built for big.
BRANCH=None

Original-Change-Id: Ic0a98550222f9dfc0aeafd67a2dd1c0c8f4ece44
Original-Signed-off-by: Gabe Black <gabeblack@google.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/186769
Original-Reviewed-by: David Hendricks <dhendrix@chromium.org>
Original-Commit-Queue: Gabe Black <gabeblack@chromium.org>
Original-Tested-by: Gabe Black <gabeblack@chromium.org>
(cherry picked from commit 1866a4d2a001beb97779b611b8b69c63175048f4)
Signed-off-by: Marc Jones <marc.jones@se-eng.com>

Change-Id: If1ca8b5bd4efab8962e03c0d9eaa70c0327ea6b5
Reviewed-on: http://review.coreboot.org/7405
Tested-by: build bot (Jenkins)
Reviewed-by: David Hendricks <dhendrix@chromium.org>
This commit is contained in:
Gabe Black 2014-02-15 00:05:03 -08:00 committed by Marc Jones
parent 558e9b55c8
commit 83ed805cd9
2 changed files with 4 additions and 2 deletions
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3
src/mainboard/google/nyan/romstage.c
View File

@ -93,7 +93,8 @@ static void __attribute__((noinline)) romstage(void)
mmu_config_range(dram_start, dram_size, DCACHE_WRITEBACK);
mmu_config_range(CONFIG_DRAM_DMA_START >> 20,
CONFIG_DRAM_DMA_SIZE >> 20, DCACHE_OFF);
mmu_config_range(dram_end, 4096 - dram_end, DCACHE_OFF);
if (dram_end < 4096)
mmu_config_range(dram_end, 4096 - dram_end, DCACHE_OFF);
mmu_disable_range(0, 1);
dcache_mmu_enable();

3
src/mainboard/google/nyan_big/romstage.c
View File

@ -93,7 +93,8 @@ static void __attribute__((noinline)) romstage(void)
mmu_config_range(dram_start, dram_size, DCACHE_WRITEBACK);
mmu_config_range(CONFIG_DRAM_DMA_START >> 20,
CONFIG_DRAM_DMA_SIZE >> 20, DCACHE_OFF);
mmu_config_range(dram_end, 4096 - dram_end, DCACHE_OFF);
if (dram_end < 4096)
mmu_config_range(dram_end, 4096 - dram_end, DCACHE_OFF);
mmu_disable_range(0, 1);
dcache_mmu_enable();