This commit introduces a new configuration option X86_RUN_64BIT_NO_SPL
to allow building U-Boot as a 64-bit binary without using the SPL
(Secondary Program Loader). The motivation is to simplify the boot
process for certain x86-based platforms that do not require SPL, such as
those booting directly from a 64-bit coreboot firmware.
This update revises the `X86_RUN_64BIT` configuration to more accurately
describe its role as "32-bit SPL followed by 64-bit U-Boot." It
clarifies the sequence of operations during the boot process, where the
system transitions from a 32-bit SPL (Secondary Program Loader) to the
main 64-bit U-Boot.
Signed-off-by: Jeremy Compostella <jeremy.composte...@intel.com>
Reviewed-by: Simon Glass <s...@chromium.org>
---
arch/x86/Kconfig | 10 +++++++++-
arch/x86/cpu/coreboot/Kconfig | 2 +-
2 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 006a59d6fa6..dc9483ad723 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -30,7 +30,7 @@ config X86_RUN_32BIT
arch_phys_memset() can be used for basic access to other memory.
config X86_RUN_64BIT
- bool "64-bit"
+ bool "32-bit SPL followed by 64-bit U-Boot"
select X86_64
select SPL if !EFI_APP
select SPL_SEPARATE_BSS if !EFI_APP
@@ -40,6 +40,14 @@ config X86_RUN_64BIT
runs through the 16-bit and 32-bit init, then switches to 64-bit
mode and jumps to U-Boot proper.
+config X86_RUN_64BIT_NO_SPL
+ bool "64-bit"
+ select X86_64
+ help
+ Build U-Boot as a 64-bit binary without SPL. As U-Boot enters
+ in 64-bit mode, the assumption is that the silicon is fully
+ initialized (MP, page tables, etc.).
+
endchoice
config X86_64
diff --git a/arch/x86/cpu/coreboot/Kconfig b/arch/x86/cpu/coreboot/Kconfig
index 085302c0482..66f25533b97 100644
--- a/arch/x86/cpu/coreboot/Kconfig
+++ b/arch/x86/cpu/coreboot/Kconfig
@@ -26,7 +26,7 @@ config SYS_COREBOOT
imply CBMEM_CONSOLE
imply X86_TSC_READ_BASE
imply USE_PREBOOT
- select BINMAN if X86_64
+ select BINMAN if X86_RUN_64BIT
select SYSINFO
imply SYSINFO_EXTRA
--
2.48.1
