x86: coreboot: Enable standard boot

Enable bootstd options and provide instructions on how to boot a linux
distro using coreboot.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

configs/coreboot64_defconfig

@@ -10,39 +10,29 @@ CONFIG_VENDOR_COREBOOT=y
 CONFIG_TARGET_COREBOOT=y
 CONFIG_FIT=y
 CONFIG_FIT_SIGNATURE=y
+CONFIG_BOOTSTD_FULL=y
+CONFIG_BOOTSTD_DEFAULTS=y
 CONFIG_SYS_MONITOR_BASE=0x01120000
 CONFIG_SHOW_BOOT_PROGRESS=y
 CONFIG_USE_BOOTARGS=y
 CONFIG_BOOTARGS="root=/dev/sdb3 init=/sbin/init rootwait ro"
-CONFIG_USE_BOOTCOMMAND=y
-CONFIG_BOOTCOMMAND="ext2load scsi 0:3 01000000 /boot/vmlinuz; zboot 01000000"
 CONFIG_PRE_CONSOLE_BUFFER=y
 CONFIG_SYS_CONSOLE_INFO_QUIET=y
 CONFIG_DISPLAY_BOARDINFO_LATE=y
 CONFIG_SPL_NO_BSS_LIMIT=y
-CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PBSIZE=532
 CONFIG_CMD_IDE=y
 CONFIG_CMD_MMC=y
-CONFIG_CMD_PART=y
 CONFIG_CMD_SATA=y
 CONFIG_CMD_USB=y
 # CONFIG_CMD_SETEXPR is not set
-CONFIG_CMD_DHCP=y
 CONFIG_BOOTP_BOOTFILESIZE=y
-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_ENV_OVERWRITE=y
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y

configs/coreboot_defconfig

@@ -10,6 +10,7 @@ CONFIG_TARGET_COREBOOT=y
 CONFIG_FIT=y
 CONFIG_FIT_SIGNATURE=y
 CONFIG_BOOTSTD_FULL=y
+CONFIG_BOOTSTD_DEFAULTS=y
 CONFIG_SYS_MONITOR_BASE=0x01110000
 CONFIG_SHOW_BOOT_PROGRESS=y
 CONFIG_USE_BOOTARGS=y

doc/board/coreboot/coreboot.rst

@@ -67,9 +67,21 @@ To use 4GB of memory, typically necessary for booting Linux distros, add
 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.
+can be useful for running UEFI applications, for example with the coreboot
+build in `$CBDIR`::
+
+   DISK=ubuntu-23.04-desktop-amd64.iso
+   CBDIR=~/coreboot/build
+
+   cp $CBDIR/coreboot.rom.in coreboot.rom
+   cbfstool coreboot.rom add-flat-binary -f u-boot-x86-with-spl.bin \
+      -n fallback/payload -c lzma -l 0x1110000 -e 0x1110000
+
+   qemu-system-x86_64 -m 2G -smp 4 -bios coreboot.rom \
+      -drive id=disk,file=$DISK,if=none \
+      -device ahci,id=ahci \
+      -device ide-hd,drive=disk,bus=ahci.0 \
 
-This has only been lightly tested.
 
 CBFS access
 -----------