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x86: Add a 64-bit 'coreboot64' build 

Coreboot is a first-stage bootloader mostly used on x86 devices as an
alternative to UEFI. Coreboot runs in 32-bit mode.

U-Boot currently supports booting from coreboot as a second-stage
bootloader, also in 32-bit mode. However it is useful to be able to run
U-Boot in 64-bit mode. To do this we can have a 32-bit SPL which switches
over the CPU and jumps to a 64-bit U-Boot proper.

Add a new 'coreboot64' board for running 64-bit U-Boot from coreboot. This
uses binman to create an image with a 32-bit SPL and a 64-bit U-Boot.

This allows running 64-bit EFI images on x86, for example, without needing
a native U-Boot port for a board.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2020-05-01 07:36:10 -06:00 committed by Bin Meng
parent 8d99d5434b
commit 538437ed39
3 changed files with 65 additions and 0 deletions
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7
board/coreboot/coreboot/MAINTAINERS
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@ -4,3 +4,10 @@ S: Maintained
F: board/coreboot/coreboot/
F: include/configs/chromebook_link.h
F: configs/coreboot_defconfig
COREBOOT64 BOARD
M: Simon Glass <sjg@chromium.org>
S: Maintained
F: board/coreboot/coreboot/
F: include/configs/chromebook_link.h
F: configs/coreboot64_defconfig

48
configs/coreboot64_defconfig Normal file
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@ -0,0 +1,48 @@
CONFIG_X86=y
CONFIG_SYS_TEXT_BASE=0x1120000
CONFIG_ENV_SIZE=0x1000
CONFIG_NR_DRAM_BANKS=8
CONFIG_PRE_CON_BUF_ADDR=0x100000
CONFIG_X86_RUN_64BIT=y
CONFIG_VENDOR_COREBOOT=y
CONFIG_TARGET_COREBOOT=y
CONFIG_SPL_TEXT_BASE=0x1110000
CONFIG_FIT=y
CONFIG_FIT_SIGNATURE=y
CONFIG_SHOW_BOOT_PROGRESS=y
CONFIG_USE_BOOTARGS=y
CONFIG_BOOTARGS="root=/dev/sdb3 init=/sbin/init rootwait ro"
CONFIG_PRE_CONSOLE_BUFFER=y
CONFIG_SYS_CONSOLE_INFO_QUIET=y
CONFIG_DISPLAY_BOARDINFO_LATE=y
CONFIG_LAST_STAGE_INIT=y
CONFIG_HUSH_PARSER=y
CONFIG_CMD_IDE=y
CONFIG_CMD_MMC=y
CONFIG_CMD_PART=y
CONFIG_CMD_USB=y
# CONFIG_CMD_SETEXPR is not set
CONFIG_CMD_DHCP=y
# CONFIG_CMD_NFS is not set
CONFIG_CMD_PING=y
CONFIG_CMD_TIME=y
CONFIG_CMD_SOUND=y
CONFIG_CMD_EXT2=y
CONFIG_CMD_EXT4=y
CONFIG_CMD_EXT4_WRITE=y
CONFIG_CMD_FAT=y
CONFIG_CMD_FS_GENERIC=y
CONFIG_MAC_PARTITION=y
# CONFIG_SPL_MAC_PARTITION is not set
# CONFIG_SPL_DOS_PARTITION is not set
CONFIG_ISO_PARTITION=y
CONFIG_EFI_PARTITION=y
# CONFIG_SPL_EFI_PARTITION is not set
CONFIG_DEFAULT_DEVICE_TREE="coreboot"
CONFIG_SYS_RELOC_GD_ENV_ADDR=y
CONFIG_REGMAP=y
CONFIG_SYSCON=y
# CONFIG_PCI_PNP is not set
CONFIG_SOUND=y
CONFIG_SOUND_I8254=y
CONFIG_CONSOLE_SCROLL_LINES=5

10
doc/board/coreboot/coreboot.rst
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@ -40,3 +40,13 @@ To enable video you must enable these options in coreboot:
At present it seems that for Minnowboard Max, coreboot does not pass through
the video information correctly (it always says the resolution is 0x0). This
works correctly for link though.
64-bit U-Boot
-------------
In addition to the 32-bit 'coreboot' build there is a 'coreboot64' build. This
produces an image which can be booted from coreboot (32-bit). Internally it
works by using a 32-bit SPL binary to switch to 64-bit for running U-Boot. It
can be useful for running UEFI applications, for example.
This has only been lightly tested.