diff options
Diffstat (limited to 'src/mainboard')
| -rw-r--r-- | src/mainboard/google/nyan/romstage.c | 6 | ||||
| -rw-r--r-- | src/mainboard/google/nyan_big/romstage.c | 6 |
2 files changed, 12 insertions, 0 deletions
diff --git a/src/mainboard/google/nyan/romstage.c b/src/mainboard/google/nyan/romstage.c index 28827c8d5f..175eb6fc3e 100644 --- a/src/mainboard/google/nyan/romstage.c +++ b/src/mainboard/google/nyan/romstage.c @@ -89,10 +89,16 @@ static void __attribute__((noinline)) romstage(void) u32 dram_size = dram_end - dram_start; mmu_init(); + /* Device memory below DRAM is uncached. */ mmu_config_range(0, dram_start, DCACHE_OFF); + /* SRAM is cached. Round the size up to 2MB, the LPAE page size. */ + mmu_config_range(0x40000000 >> 20, 2, DCACHE_WRITEBACK); + /* DRAM is cached. */ mmu_config_range(dram_start, dram_size, DCACHE_WRITEBACK); + /* A window for DMA is uncached. */ mmu_config_range(CONFIG_DRAM_DMA_START >> 20, CONFIG_DRAM_DMA_SIZE >> 20, DCACHE_OFF); + /* The space above DRAM is uncached. */ if (dram_end < 4096) mmu_config_range(dram_end, 4096 - dram_end, DCACHE_OFF); mmu_disable_range(0, 1); diff --git a/src/mainboard/google/nyan_big/romstage.c b/src/mainboard/google/nyan_big/romstage.c index 0fbe316882..51f5a49264 100644 --- a/src/mainboard/google/nyan_big/romstage.c +++ b/src/mainboard/google/nyan_big/romstage.c @@ -89,10 +89,16 @@ static void __attribute__((noinline)) romstage(void) u32 dram_size = dram_end - dram_start; mmu_init(); + /* Device memory below DRAM is uncached. */ mmu_config_range(0, dram_start, DCACHE_OFF); + /* SRAM is cached. Round the size up to 2MB, the LPAE page size. */ + mmu_config_range(0x40000000 >> 20, 2, DCACHE_WRITEBACK); + /* DRAM is cached. */ mmu_config_range(dram_start, dram_size, DCACHE_WRITEBACK); + /* A window for DMA is uncached. */ mmu_config_range(CONFIG_DRAM_DMA_START >> 20, CONFIG_DRAM_DMA_SIZE >> 20, DCACHE_OFF); + /* The space above DRAM is uncached. */ if (dram_end < 4096) mmu_config_range(dram_end, 4096 - dram_end, DCACHE_OFF); mmu_disable_range(0, 1); |