From 476476e73b14696563524cbc2627a4c033ea64da Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Tue, 4 Aug 2015 12:33:52 -0600 Subject: 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 Improvements to how the payload is built: Signed-off-by: Bin Meng Reviewed-by: Bin Meng Tested-by: Bin Meng --- arch/x86/config.mk | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'arch/x86/config.mk') 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) -- cgit v1.2.3