This little series adds a few checks into the code to allow better operation when booting a build from a previous-state loader such as coreboot.
At present we have a 'coreboot' target but this runs very different code from the bare-metal targets, such as coral. There is very little in common between them.
It is useful to be able to boot the same U-Boot on a device, with or without a first-stage bootloader. For example, with chromebook_coral, it is helpful for testing to be able to boot the same U-Boot (complete with FSP) on bare metal and from coreboot. It allows checking of things like CPU speed, comparing registers, ACPI tables and the like.
This series allows U-Boot to detect that it ran from coreboot and automatically do the right thing.
This series makes the most important changes to allow the same u-boot.bin for coral to boot after coreboot (by itself) or bare metal (via TPL->SPL).
Changes in v4: - Rename flag to GD_FLG_SKIP_LL_INIT - Add new patch to move coreboot-table detection into common code - Rename flag to GD_FLG_SKIP_LL_INIT - Split this patch into two - Update to use locate_coreboot_table()
Changes in v3: - Add a new patch with a gd flag for chain loading - Add new patch to detect running from coreboot
Changes in v2: - Drop the other check in interrupt_init() which is not needed now - Drop patch 'dm: Avoid initing built-in devices when chain loading'
Simon Glass (9): x86: fsp: Allow skipping init code when chain loading x86: apl: Skip init code when chain loading x86: cpu: Skip init code when chain loading pci: Avoid auto-config when chain loading board: Add a gd flag for chain loading x86: Move coreboot-table detection into common code x86: Add a way to detect running from coreboot x86: Use the existing stack when chain-loading x86: Add documentation for the chain-load feature
arch/x86/cpu/apollolake/fsp_s.c | 2 ++ arch/x86/cpu/coreboot/tables.c | 24 +++++++++------------- arch/x86/cpu/cpu.c | 4 +++- arch/x86/cpu/i386/cpu.c | 27 +++++++++++++++++++++++++ arch/x86/cpu/i386/interrupt.c | 6 ++++-- arch/x86/cpu/start_from_spl.S | 16 +++++++++++++-- arch/x86/include/asm/coreboot_tables.h | 7 +++++++ arch/x86/lib/fsp/fsp_dram.c | 8 ++++++++ arch/x86/lib/fsp/fsp_graphics.c | 3 +++ arch/x86/lib/fsp2/fsp_dram.c | 10 +++++++++ arch/x86/lib/fsp2/fsp_init.c | 2 +- arch/x86/lib/init_helpers.c | 3 +++ doc/arch/x86.rst | 28 ++++++++++++++++++++++++++ drivers/pci/pci-uclass.c | 4 ++-- include/asm-generic/global_data.h | 1 + include/init.h | 2 +- 16 files changed, 123 insertions(+), 24 deletions(-)