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Misc QEMU fixes #839

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Misc QEMU fixes #839

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configs/config.emulation_qemu_x86_q35_uefi: Enable ReBAR and Above 4G…
mkopec Feb 3, 2026
f830a23
configs/config.emulation_qemu_x86_q35_uefi_all_menus: sync with base …
mkopec Feb 3, 2026
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19 changes: 19 additions & 0 deletions configs/config.emulation_qemu_x86_q35_uefi
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Original file line number Diff line number Diff line change
Expand Up @@ -2,10 +2,12 @@ CONFIG_LOCALVERSION="v0.2.1-rc1"
CONFIG_OPTION_BACKEND_NONE=y
CONFIG_BOARD_EMULATION_QEMU_X86_Q35=y
CONFIG_EDK2_BOOT_TIMEOUT=3
CONFIG_PCIEXP_DEFAULT_MAX_RESIZABLE_BAR_BITS=35
CONFIG_TPM_MEASURED_BOOT=y
CONFIG_EDK2_BOOTSPLASH_FILE="3rdparty/dasharo-blobs/dasharo/bootsplash.bmp"
CONFIG_CPU_QEMU_X86_TSEG_SMM=y
CONFIG_UDK_202005_BINDING=y
CONFIG_PCIEXP_SUPPORT_RESIZABLE_BARS=y
CONFIG_DRIVERS_EFI_VARIABLE_STORE=y
CONFIG_DRIVERS_EFI_FW_INFO=y
CONFIG_DRIVERS_EFI_MAIN_FW_GUID="20651b14-8653-4d9b-a75a-67fa76e0ada5"
Expand All @@ -20,6 +22,7 @@ CONFIG_DEFAULT_CONSOLE_LOGLEVEL_0=y
CONFIG_PAYLOAD_EDK2=y
CONFIG_EDK2_CBMEM_LOGGING=y
CONFIG_EDK2_SERIAL_SUPPORT=y
CONFIG_EDK2_CUSTOM_BUILD_PARAMS="-D ABOVE_4G_MEMORY=TRUE"
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@SergiiDmytruk SergiiDmytruk Feb 4, 2026

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ABOVE_4G_MEMORY is enabled by default.

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@mkopec mkopec Feb 5, 2026

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It wasn't enabled when I was testing. Actually the Kconfig option EDK2_ABOVE_4G_MEMORY is missing entirely from Kconfig files, so the Makefile will set it to False explicitly:

coreboot/payloads/external/edk2/Makefile

Lines 191 to 194 in c7bf17c

# ABOVE_4G_MEMORY = TRUE
ifneq ($(CONFIG_EDK2_ABOVE_4G_MEMORY),y)
BUILD_STR += -D ABOVE_4G_MEMORY=FALSE
endif

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@SergiiDmytruk SergiiDmytruk Feb 5, 2026

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I meant that it's enabled in the DSC file and didn't expect CONFIG_EDK2_ABOVE_4G_MEMORY to be undefined. Apparently, it's a Dasharo-specific option which got broken at some point. Seems like we're always passing ABOVE_4G_MEMORY=FALSE to EDK? Not sure we've ever intended that.

CONFIG_BUILD_IPXE=y
CONFIG_IPXE_ADD_SCRIPT=y
CONFIG_IPXE_SCRIPT="3rdparty/dasharo-blobs/dasharo/dasharo.ipxe"
Expand All @@ -33,10 +36,26 @@ CONFIG_EDK2_SETUP_PASSWORD=y
CONFIG_EDK2_PERFORMANCE_MEASUREMENT_ENABLE=y
CONFIG_EDK2_DASHARO_SYSTEM_FEATURES=y
CONFIG_EDK2_DASHARO_SECURITY_OPTIONS=y
CONFIG_EDK2_SHOW_CAMERA_OPTION=y
CONFIG_EDK2_SHOW_WIFI_BT_OPTION=y
CONFIG_EDK2_DASHARO_INTEL_ME_OPTIONS=y
CONFIG_EDK2_DASHARO_USB_CONFIG=y
CONFIG_EDK2_DASHARO_NETWORK_CONFIG=y
CONFIG_EDK2_DASHARO_CHIPSET_CONFIG=y
CONFIG_EDK2_DASHARO_POWER_CONFIG=y
CONFIG_EDK2_SLEEP_TYPE_OPTION=y
CONFIG_EDK2_FAN_CURVE_OPTION=y
CONFIG_EDK2_BATTERY_CONFIG_OPTION=y
CONFIG_EDK2_CPU_THROTTLING_THRESHOLD_OPTION=y
CONFIG_EDK2_DASHARO_PCI_CONFIG=y
CONFIG_EDK2_DASHARO_MEMORY_CONFIG=y
CONFIG_EDK2_DASHARO_SPD_PROFILE_OPTION=y
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@SergiiDmytruk SergiiDmytruk Feb 4, 2026

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All these options weren't enabled in this config because they don't actually work.

CONFIG_EDK2_DASHARO_SERIAL_REDIRECTION_DEFAULT_ENABLE=y
CONFIG_EDK2_HAVE_2ND_UART=y
CONFIG_EDK2_DASHARO_CPU_CONFIG=y
CONFIG_EDK2_CORE_DISABLE_OPTION=y
CONFIG_EDK2_HYPERTHREADING_OPTION=y
CONFIG_EDK2_BOOT_MENU_KEY=0x0017
CONFIG_EDK2_SETUP_MENU_KEY=0x000C
CONFIG_EDK2_RAM_DISK_ENABLE=y
CONFIG_EDK2_CREATE_PREINSTALLED_BOOT_OPTIONS=y