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| author | Simon Glass <sjg@chromium.org> | 2015-08-04 12:33:52 -0600 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2015-08-05 08:44:06 -0600 |
| commit | 476476e73b14696563524cbc2627a4c033ea64da (patch) | |
| tree | ddd2da016f47be232d02b4fb3be7b4264e7b1043 /arch | |
| parent | 465a67cf529bd2f7a5ca871aff3fa63faa142516 (diff) | |
| download | blackbird-obmc-uboot-476476e73b14696563524cbc2627a4c033ea64da.tar.gz blackbird-obmc-uboot-476476e73b14696563524cbc2627a4c033ea64da.zip | |
efi: Add support for loading U-Boot through an EFI stub
It is useful to be able to load U-Boot onto a board even if is it already
running EFI. This can allow access to the U-Boot command interface, flexible
booting options and easier development.
The easiest way to do this is to build U-Boot as a binary blob and have an
EFI stub copy it into RAM. Add support for this feature, targeting 32-bit
initially.
Also add a way to detect when U-Boot has been loaded via a stub. This goes
in common.h since it needs to be widely available so that we avoid redoing
initialisation that should be skipped.
Signed-off-by: Simon Glass <sjg@chromium.org>
Improvements to how the payload is built:
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/config.mk | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/config.mk b/arch/x86/config.mk index e27f84abda..334c10b882 100644 --- a/arch/x86/config.mk +++ b/arch/x86/config.mk @@ -24,6 +24,10 @@ PLATFORM_LDFLAGS += -Bsymbolic -Bsymbolic-functions -m elf_i386 LDFLAGS_FINAL += --wrap=__divdi3 --wrap=__udivdi3 LDFLAGS_FINAL += --wrap=__moddi3 --wrap=__umoddi3 +# This is used in the top-level Makefile which does not include +# PLATFORM_LDFLAGS +LDFLAGS_EFI_PAYLOAD := -Bsymbolic -Bsymbolic-functions -shared --no-undefined + OBJCOPYFLAGS_EFI := -j .text -j .sdata -j .data -j .dynamic -j .dynsym \ -j .rel -j .rela -j .reloc @@ -31,6 +35,9 @@ CFLAGS_NON_EFI := -mregparm=3 CFLAGS_EFI := -fpic -fshort-wchar EFIARCH = ia32 +EFIPAYLOAD_BFDTARGET = elf32-i386 + +EFIPAYLOAD_BFDARCH = i386 LDSCRIPT_EFI := $(srctree)/$(CPUDIR)/efi/elf_$(EFIARCH)_efi.lds OBJCOPYFLAGS_EFI += --target=efi-app-$(EFIARCH) |
