Gabe Black (gabeblack@chromium.org) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/3654
-gerrit
commit 7306681a84a07a87fa803aa2da591073af07d116 Author: Gabe Black gabeblack@google.com Date: Sat May 18 22:57:34 2013 -0700
exynos5250: Don't disable and re-enable the MMU when uncaching the framebuffer.
At one time it seemed to be necessary to disable and then re-enable the MMU when setting the framebuffer to be uncache-able due to bugs in the MMU management code. Since those bugs have been fixed, this is no longer necessary.
Change-Id: I5f7b9bd14dc9929efe1834ec9a258d388b8c94e9 Signed-off-by: Gabe Black gabeblack@chromium.org --- src/cpu/samsung/exynos5250/cpu.c | 4 ---- 1 file changed, 4 deletions(-)
diff --git a/src/cpu/samsung/exynos5250/cpu.c b/src/cpu/samsung/exynos5250/cpu.c index 3ab57c9..d2a6df7 100644 --- a/src/cpu/samsung/exynos5250/cpu.c +++ b/src/cpu/samsung/exynos5250/cpu.c @@ -105,15 +105,11 @@ static void exynos_displayport_init(device_t dev) * Note: We may want to do something clever to ensure the framebuffer * region is aligned such that we don't change dcache policy for other * stuff inadvertantly. - * - * FIXME: Is disabling/re-enabling the MMU entirely necessary? */ uint32_t lower = ALIGN_DOWN(lcdbase, MiB); uint32_t upper = ALIGN_UP(lcdbase + fb_size, MiB); dcache_clean_invalidate_by_mva(lower, upper - lower); - dcache_mmu_disable(); mmu_config_range(lower/MiB, (upper - lower)/MiB, DCACHE_OFF); - dcache_mmu_enable();
mmio_resource(dev, 1, lcdbase/KiB, (fb_size + KiB - 1)/KiB); printk(BIOS_DEBUG,