From: Gabe Black gabeblack@chromium.org
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 --- Changes in v6: - Rename option to CONFIG_X86_NO_RESET_VECTOR - Adjust Makefiles to deal with CONFIG_X86_NO_RESET_VECTOR
Changes in v5: - Use CONFIG_NO_RESET_CODE again (as v3), check it in arch config.h
Changes in v4: - Use CONFIG_SYS_X86_RESET_VECTOR instead CONFIG_NO_RESET_CODE - Add note about CONFIG_SYS_X86_RESET_VECTOR to README
Changes in v3: - Fix incorrect repeated line in Makefile
Changes in v2: - Put CONFIG_NO_RESET_CODE into Makefile instead of source files
Makefile | 6 +++--- README | 4 ++++ arch/x86/cpu/Makefile | 5 +++-- arch/x86/cpu/u-boot.lds | 3 +++ 4 files changed, 13 insertions(+), 5 deletions(-)
diff --git a/Makefile b/Makefile index 1a17be9..1d564b3 100644 --- a/Makefile +++ b/Makefile @@ -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)
diff --git a/README b/README index 2dc0984..163c109 100644 --- a/README +++ b/README @@ -3621,6 +3621,10 @@ 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 }