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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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
board/coreboot/coreboot/MAINTAINERS
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@ -4,3 +4,10 @@ S: Maintained
F: board/coreboot/coreboot/ F: board/coreboot/coreboot/
F: include/configs/chromebook_link.h F: include/configs/chromebook_link.h
F: configs/coreboot_defconfig 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 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 the video information correctly (it always says the resolution is 0x0). This
works correctly for link though. 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.