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>

diff --git a/board/coreboot/coreboot/MAINTAINERS b/board/coreboot/coreboot/MAINTAINERS
index 188906b0803262e27e93eec7b469e47ab835b40d..a05673bb0be71420a65182237eca620bc3d5a1a5 100644 (file)
--- a/board/coreboot/coreboot/MAINTAINERS
+++ b/board/coreboot/coreboot/MAINTAINERS
@@ -4,3 +4,10 @@ S:     Maintained
 F:     board/coreboot/coreboot/
 F:     include/configs/chromebook_link.h
 F:     configs/coreboot_defconfig
 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

diff --git a/configs/coreboot64_defconfig b/configs/coreboot64_defconfig
new file mode 100644 (file)
index 0000000..80353b8
--- /dev/null
+++ b/configs/coreboot64_defconfig
@@ -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

diff --git a/doc/board/coreboot/coreboot.rst b/doc/board/coreboot/coreboot.rst
index fd974229eb4ca22d9cc41f798514e1ea55ec99e5..9c44c025a48f3e6b968d176922beba549ffe41cc 100644 (file)
--- a/doc/board/coreboot/coreboot.rst
+++ b/doc/board/coreboot/coreboot.rst
@@ -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.
 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.