Change in coreboot[master]: mb/emulation/qemu-i440fx|q35: Fix stack size

[Patrick Rudolph (Code Review)]

Patrick Rudolph has uploaded this change for review. ( https://review.coreboot.org/29611

Change subject: mb/emulation/qemu-i440fx|q35: Fix stack size
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mb/emulation/qemu-i440fx|q35: Fix stack size

Current implementation works by luck as DCACHE area is actually RAM and
stack can grow and use that RAM outside of the area.

* Set DCACHE_BSP_STACK_SIZE to 0x4000.
* Add an assert to make sure it is set to a sane value on all platforms.

Change-Id: I71f9d74d89e4129cdc4a850acc4fc1ac90e5f628
Signed-off-by: Patrick Rudolph 
---
M src/arch/x86/car.ld
M src/mainboard/emulation/qemu-i440fx/Kconfig
M src/mainboard/emulation/qemu-q35/Kconfig
3 files changed, 11 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/11/29611/1

diff --git a/src/arch/x86/car.ld b/src/arch/x86/car.ld
index 33fb5c9..4472b42 100644
--- a/src/arch/x86/car.ld
+++ b/src/arch/x86/car.ld
@@ -113,3 +113,6 @@
 #if IS_ENABLED(CONFIG_PAGING_IN_CACHE_AS_RAM)
 _bogus2 = ASSERT(_pagetables == ALIGN(_pagetables, 4096), "_pagetables aren't 4KiB aligned");
 #endif
+#if IS_ENABLED(CONFIG_C_ENVIRONMENT_BOOTBLOCK)
+_bogus3 = ASSERT(CONFIG_DCACHE_BSP_STACK_SIZE > 0x0, "BSP stack size is to small");
+#endif
\ No newline at end of file
diff --git a/src/mainboard/emulation/qemu-i440fx/Kconfig b/src/mainboard/emulation/qemu-i440fx/Kconfig
index 2435729..4454e67 100644
--- a/src/mainboard/emulation/qemu-i440fx/Kconfig
+++ b/src/mainboard/emulation/qemu-i440fx/Kconfig
@@ -41,4 +41,8 @@
    hex
    default 0x4000

+config DCACHE_BSP_STACK_SIZE
+	hex
+	default 0x4000
+
 endif # BOARD_EMULATION_QEMU_X86_I440FX
diff --git a/src/mainboard/emulation/qemu-q35/Kconfig b/src/mainboard/emulation/qemu-q35/Kconfig
index 4394530..3be034a 100644
--- a/src/mainboard/emulation/qemu-q35/Kconfig
+++ b/src/mainboard/emulation/qemu-q35/Kconfig
@@ -49,4 +49,8 @@
    hex
    default 0x4000

+config DCACHE_BSP_STACK_SIZE
+	hex
+	default 0x4000
+
 endif # BOARD_EMULATION_QEMU_X86_Q35