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| author | Gabe Black <gabeblack@chromium.org> | 2012-11-27 21:08:06 +0000 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2012-11-28 11:40:03 -0800 |
| commit | b16f521a5e87208cebbd17964452e11704416c3f (patch) | |
| tree | f3a37b94139b202e67fcebd905a91e2ff6eb07da | |
| parent | 8a487a4417221412d1cd23d4e08253fc9413be51 (diff) | |
| download | u-boot-b16f521a5e87208cebbd17964452e11704416c3f.zip u-boot-b16f521a5e87208cebbd17964452e11704416c3f.tar.gz u-boot-b16f521a5e87208cebbd17964452e11704416c3f.tar.bz2 | |
x86: Allow excluding reset vector code from u-boot
When running from coreboot we don't want this code.
This version works by ifdef-ing out all of the code that would go
into those sections and all the code that refers to it. The sections are
then empty, and the linker will either leave them empty for the loader
to ignore or remove them entirely.
Signed-off-by: Gabe Black <gabeblack@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
| -rw-r--r-- | Makefile | 6 | ||||
| -rw-r--r-- | README | 4 | ||||
| -rw-r--r-- | arch/x86/cpu/Makefile | 5 | ||||
| -rw-r--r-- | arch/x86/cpu/u-boot.lds | 3 |
4 files changed, 13 insertions, 5 deletions
@@ -231,8 +231,8 @@ endif OBJS = $(CPUDIR)/start.o ifeq ($(CPU),x86) -OBJS += $(CPUDIR)/start16.o -OBJS += $(CPUDIR)/resetvec.o +RESET_OBJS-$(CONFIG_X86_NO_RESET_VECTOR) += $(CPUDIR)/start16.o +RESET_OBJS-$(CONFIG_X86_NO_RESET_VECTOR) += $(CPUDIR)/resetvec.o endif ifeq ($(CPU),ppc4xx) OBJS += $(CPUDIR)/resetvec.o @@ -241,7 +241,7 @@ ifeq ($(CPU),mpc85xx) OBJS += $(CPUDIR)/resetvec.o endif -OBJS := $(addprefix $(obj),$(OBJS)) +OBJS := $(addprefix $(obj),$(OBJS) $(RESET_OBJS-)) HAVE_VENDOR_COMMON_LIB = $(if $(wildcard board/$(VENDOR)/common/Makefile),y,n) @@ -3664,6 +3664,10 @@ Low Level (hardware related) configuration options: be used if available. These functions may be faster under some conditions but may increase the binary size. +- CONFIG_X86_NO_RESET_VECTOR + If defined, the x86 reset vector code is excluded. You will need + to do this when U-Boot is running from Coreboot. + Freescale QE/FMAN Firmware Support: ----------------------------------- diff --git a/arch/x86/cpu/Makefile b/arch/x86/cpu/Makefile index 7f1fc18..be27dd9 100644 --- a/arch/x86/cpu/Makefile +++ b/arch/x86/cpu/Makefile @@ -28,12 +28,13 @@ include $(TOPDIR)/config.mk LIB = $(obj)lib$(CPU).o -START = start.o start16.o resetvec.o +START-y = start.o +RESET_OBJS-$(CONFIG_X86_NO_RESET_VECTOR) += resetvec.o start16.o COBJS = interrupts.o cpu.o SRCS := $(START:.o=.S) $(SOBJS:.o=.S) $(COBJS:.o=.c) OBJS := $(addprefix $(obj),$(SOBJS) $(COBJS)) -START := $(addprefix $(obj),$(START)) +START := $(addprefix $(obj),$(START-y) $(RESET_OBJS-)) all: $(obj).depend $(START) $(LIB) diff --git a/arch/x86/cpu/u-boot.lds b/arch/x86/cpu/u-boot.lds index a1ecefa..0c6f0e3 100644 --- a/arch/x86/cpu/u-boot.lds +++ b/arch/x86/cpu/u-boot.lds @@ -86,6 +86,8 @@ SECTIONS __bios_start = LOADADDR(.bios); __bios_size = SIZEOF(.bios); +#ifndef CONFIG_X86_NO_RESET_VECTOR + /* * The following expressions place the 16-bit Real-Mode code and * Reset Vector at the end of the Flash ROM @@ -95,4 +97,5 @@ SECTIONS . = RESET_VEC_LOC; .resetvec : AT (CONFIG_SYS_TEXT_BASE + (CONFIG_SYS_MONITOR_LEN - RESET_SEG_SIZE + RESET_VEC_LOC)) { KEEP(*(.resetvec)); } +#endif } |