lbmk/config/coreboot/default/patches/0035-src-intel-skylake-Disable-stack-overflow-debug-optio.patch

From 18f4e970ebda43dd538f74398aea463a67040dd3 Mon Sep 17 00:00:00 2001
From: Leah Rowe <leah@libreboot.org>
Date: Mon, 6 Jan 2025 01:36:23 +0000
Subject: [PATCH 35/37] src/intel/skylake: Disable stack overflow debug options

The option was appearing in T480/3050micro configs of lbmk,
after updating on the coreboot/next uprev for 20241206 rev8:

CONFIG_DEBUG_STACK_OVERFLOW_BREAKPOINTS=y

I did some digging. See coreboot commit:

commit 51cc2bacb6b07279b97e9934d079060475481fb6
Author: Subrata Banik <subratabanik@google.com>
Date:   Fri Dec 13 13:07:28 2024 +0530

    soc/intel/pantherlake: Disable stack overflow debug options

Well now:

I'm disabling this behaviour on Skylake, for the same
behaviour, because I want as few behaviour changes in general,
as possible, for the rev8 release.

According to Subrata's patch, which was for Pantherlake,
without this change, stack corruption can occur on verstage
and romstage early on. Please look at that coreboot patch,
referenced above, for clarity.

I see no harm in disabling this option for Skylake, since
the behaviour that it otherwise enables was not present
before.

Signed-off-by: Leah Rowe <leah@libreboot.org>
---
 src/soc/intel/skylake/Kconfig | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/soc/intel/skylake/Kconfig b/src/soc/intel/skylake/Kconfig
index d51ffaef7b..42af82a5d8 100644
--- a/src/soc/intel/skylake/Kconfig
+++ b/src/soc/intel/skylake/Kconfig
@@ -129,6 +129,15 @@ config DCACHE_RAM_SIZE
 	  The size of the cache-as-ram region required during bootblock
 	  and/or romstage.
 
+# Override DEBUG Kconfig to avoid false alarm about stack overflow.
+config DEBUG_STACK_OVERFLOW_BREAKPOINTS
+	bool
+	default n
+
+config DEBUG_STACK_OVERFLOW_BREAKPOINTS_IN_ALL_STAGES
+	bool
+	default n
+
 config DCACHE_BSP_STACK_SIZE
 	hex
 	default 0x20400 if FSP_USES_CB_STACK
-- 
2.39.5