payload/tianocore: Add patch to preserve coreboot table
Credit for this patch goes to 'ReddestDream'. The patch is pulled from https://github.com/MattDevo/edk2 TESTED on thinkpad X200. Change-Id: I1517607cee8308c5f5443c58c16ce44056611e92 Signed-off-by: Arthur Heymans <arthur@aheymans.xyz> Reviewed-on: https://review.coreboot.org/20968 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Matt DeVillier <matt.devillier@gmail.com> Reviewed-by: Nico Huber <nico.h@gmx.de>
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payloads/external/tianocore/patches/06_CorebootPayloadPkg_keep_cb_table.patch
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payloads/external/tianocore/patches/06_CorebootPayloadPkg_keep_cb_table.patch
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From 07742664925f8d055505220258f2589a9c73a80b Mon Sep 17 00:00:00 2001
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From: ReddestDream <reddestdream@gmail.com>
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Date: Wed, 3 May 2017 00:13:28 -0400
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Subject: [PATCH] CbSupportPei: prevent lower coreboot table from being
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overwritten
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Exclude the bottom 4kb from being included in System Memory HoB
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diff --git a/CorebootModulePkg/CbSupportPei/CbSupportPei.c b/CorebootModulePkg/CbSupportPei/CbSupportPei.c
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index 262e6b9d7d..da8f060783 100755
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--- a/CorebootModulePkg/CbSupportPei/CbSupportPei.c
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+++ b/CorebootModulePkg/CbSupportPei/CbSupportPei.c
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@@ -246,23 +246,20 @@ CbPeiEntryPoint (
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UINTN PmGpeEnBase;
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CB_MEM_INFO CbMemInfo;
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- //
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- // Report lower 640KB of RAM. Attribute EFI_RESOURCE_ATTRIBUTE_TESTED
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- // is intentionally omitted to prevent erasing of the coreboot header
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- // record before it is processed by CbParseMemoryInfo.
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- //
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BuildResourceDescriptorHob (
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EFI_RESOURCE_SYSTEM_MEMORY,
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(
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EFI_RESOURCE_ATTRIBUTE_PRESENT |
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EFI_RESOURCE_ATTRIBUTE_INITIALIZED |
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+ EFI_RESOURCE_ATTRIBUTE_TESTED |
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EFI_RESOURCE_ATTRIBUTE_UNCACHEABLE |
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EFI_RESOURCE_ATTRIBUTE_WRITE_COMBINEABLE |
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EFI_RESOURCE_ATTRIBUTE_WRITE_THROUGH_CACHEABLE |
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EFI_RESOURCE_ATTRIBUTE_WRITE_BACK_CACHEABLE
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),
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- (EFI_PHYSICAL_ADDRESS)(0),
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- (UINT64)(0xA0000)
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+ // Lower 640KB, except for first 4KB where the lower coreboot pointer ("LBIO") resides
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+ (EFI_PHYSICAL_ADDRESS)(0 + 0x1000),
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+ (UINT64)(0xA0000 - 0x1000)
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);
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@@ -309,7 +306,7 @@ CbPeiEntryPoint (
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// Set cache on the physical memory
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//
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MtrrSetMemoryAttribute (BASE_1MB, LowMemorySize - BASE_1MB, CacheWriteBack);
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- MtrrSetMemoryAttribute (0, 0xA0000, CacheWriteBack);
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+ MtrrSetMemoryAttribute ((0 + 0x1000), (0xA0000 - 0x1000), CacheWriteBack);
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//
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// Create Memory Type Information HOB
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--
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2.14.0
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