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From 9c28ac87eb2df7319d4f5a48124c837b8bf123b3 Mon Sep 17 00:00:00 2001
From: ReddestDream <reddestdream@gmail.com>
Date: Wed, 3 May 2017 00:13:28 -0400
Subject: [PATCH] CbSupportPei: prevent lower coreboot table from being
overwritten
Exclude the bottom 4kb from being included in System Memory HoB
---
CorebootModulePkg/CbSupportPei/CbSupportPei.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/CorebootModulePkg/CbSupportPei/CbSupportPei.c b/CorebootModulePkg/CbSupportPei/CbSupportPei.c
index 831de89b21d1..e84b9b55288a 100755
--- a/CorebootModulePkg/CbSupportPei/CbSupportPei.c
+++ b/CorebootModulePkg/CbSupportPei/CbSupportPei.c
@@ -261,8 +261,9 @@ CbPeiEntryPoint (
EFI_RESOURCE_ATTRIBUTE_WRITE_THROUGH_CACHEABLE |
EFI_RESOURCE_ATTRIBUTE_WRITE_BACK_CACHEABLE
),
- (EFI_PHYSICAL_ADDRESS)(0),
- (UINT64)(0xA0000)
+ // Lower 640KB, except for first 4KB where the lower coreboot pointer ("LBIO") resides
+ (EFI_PHYSICAL_ADDRESS)(0 + 0x1000),
+ (UINT64)(0xA0000 - 0x1000)
);
--
2.17.0
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