[coreboot-gerrit] Patch set updated for coreboot: libpayload: mmu: Initialize the base 4GiB as device memory

[Patrick Georgi (pgeorgi@google.com)]

Patrick Georgi (pgeorgi at google.com) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/13914

-gerrit

commit 8dd3dc3c4b803eca6c76f1615be30b48d697f6a8
Author: huang lin <hl at rock-chips.com>
Date:   Thu Mar 3 15:29:34 2016 +0800

    libpayload: mmu: Initialize the base 4GiB as device memory
    
    This allows to accommodate different platforms' default
    configurations, memory configuration is fine tuned later during boot
    process.
    
    BUG=chrome-os-partner:51537
    BRANCH=none
    TEST=none yet, the full stack of patches boots fine on EVB
    
    Change-Id: I39da4ce247422f67451711ac0ed5a5e1119ed836
    Signed-off-by: Patrick Georgi <pgeorgi at chromium.org>
    Original-Commit-Id: 97a9a71ade4df8a501043f9ae58463a3135e2a4f
    Original-Change-Id: I39da4ce247422f67451711ac0ed5a5e1119ed836
    Original-Signed-off-by: huang lin <hl at rock-chips.com>
    Original-Signed-off-by: Vadim Bendebury <vbendeb at chromium.org>
    Original-Reviewed-on: https://chromium-review.googlesource.com/332384
    Original-Reviewed-by: Furquan Shaikh <furquan at chromium.org>
---
 payloads/libpayload/arch/arm64/mmu.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/payloads/libpayload/arch/arm64/mmu.c b/payloads/libpayload/arch/arm64/mmu.c
index f07e4c4..553b2d5 100644
--- a/payloads/libpayload/arch/arm64/mmu.c
+++ b/payloads/libpayload/arch/arm64/mmu.c
@@ -260,7 +260,7 @@ void mmu_config_range(void *start, size_t size, uint64_t tag)
  * Desc : Initialize mmu based on the mmu_memrange passed. ttb_buffer is used as
  * the base address for xlat tables. TTB_DEFAULT_SIZE defines the max number of
  * tables that can be used
- * Assuming that memory 0-2GiB is device memory.
+ * Assuming that memory 0-4GiB is device memory.
  */
 uint64_t mmu_init(struct mmu_ranges *mmu_ranges)
 {
@@ -275,7 +275,14 @@ uint64_t mmu_init(struct mmu_ranges *mmu_ranges)
 	printf("Libpayload ARM64: TTB_BUFFER: 0x%p Max Tables: %d\n",
 	       (void*)xlat_addr, max_tables);
 
-	mmu_config_range(NULL, 0x80000000, TYPE_DEV_MEM);
+	/*
+	 * To keep things simple we start with mapping the entire base 4GB as
+	 * device memory. This accommodates various architectures' default
+	 * settings (for instance rk3399 mmio starts at 0xf8000000); it is
+	 * fine tuned (e.g. mapping DRAM areas as write-back) later in the
+	 * boot process.
+	 */
+	mmu_config_range(NULL, 0x100000000, TYPE_DEV_MEM);
 
 	for (; i < mmu_ranges->used; i++)
 		mmu_config_range((void *)mmu_ranges->entries[i].base,