Code at: https://github.com/EvanLloyd/tianocore/commit/ From: Sami Mujawar <sami.muja...@arm.com> Date: Thu, 25 Feb 2016 15:07:40 +0000 Subject: [PATCH] ArmPlatformPkg: Allocate VRAM as RuntimeServicesData
The UEFI specification allows the operating system (OS) to use the Graphics Output Protocol (GOP) in the following scenarios: a. as part of the startup process and b. prior to loading of a high performance OS graphics driver If the VRAM is allocated as BootServicesData, then it is unmapped on exit boot services. This prevents GOP usage by the OS post exit boot services (the second scenario); as it results in a crash when the VRAM is accessed. This patch fixes the issue by allocating VRAM as RuntimeServicesData. Code at: https://github.com/EvanLloyd/tianocore/commit/18fab16a63c59c84c71cd81089a55a4081ebe253 Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Alexei Fedorov <alexei.fedo...@arm.com> Signed-off-by: Girish Pathak <girish.pat...@arm.com> Signed-off-by: Sami Mujawar <sami.muja...@arm.com> Signed-off-by: Evan Lloyd <evan.ll...@arm.com> --- ArmPlatformPkg/ArmVExpressPkg/Library/HdLcdArmVExpressLib/HdLcdArmVExpress.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/ArmPlatformPkg/ArmVExpressPkg/Library/HdLcdArmVExpressLib/HdLcdArmVExpress.c b/ArmPlatformPkg/ArmVExpressPkg/Library/HdLcdArmVExpressLib/HdLcdArmVExpress.c index a578467..4ab8862 100644 --- a/ArmPlatformPkg/ArmVExpressPkg/Library/HdLcdArmVExpressLib/HdLcdArmVExpress.c +++ b/ArmPlatformPkg/ArmVExpressPkg/Library/HdLcdArmVExpressLib/HdLcdArmVExpress.c @@ -133,7 +133,7 @@ LcdPlatformGetVram ( } else { AllocationType = AllocateAddress; } - Status = gBS->AllocatePages (AllocationType, EfiBootServicesData, EFI_SIZE_TO_PAGES(((UINTN)LCD_VRAM_SIZE)), VramBaseAddress); + Status = gBS->AllocatePages (AllocationType, EfiRuntimeServicesData, EFI_SIZE_TO_PAGES(((UINTN)LCD_VRAM_SIZE)), VramBaseAddress); if (EFI_ERROR(Status)) { return Status; } -- 2.7.0 _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
