This creates a standalone ELF that executes just the Blackfin initcode. This is useful for people who want to program the low level aspects of the CPU (memory/clocks/etc...) and can easily be used with JTAG for quick booting while developing.
Signed-off-by: Mike Frysinger vapier@gentoo.org --- Makefile | 3 ++- arch/blackfin/cpu/.gitignore | 3 +++ arch/blackfin/cpu/Makefile | 7 ++++++- arch/blackfin/cpu/init.S | 9 +++++++++ arch/blackfin/cpu/init.lds.S | 25 +++++++++++++++++++++++++ 5 files changed, 45 insertions(+), 2 deletions(-) create mode 100644 arch/blackfin/cpu/init.S create mode 100644 arch/blackfin/cpu/init.lds.S
diff --git a/Makefile b/Makefile index 3454db6..8dfb174 100644 --- a/Makefile +++ b/Makefile @@ -1089,7 +1089,8 @@ clean: $(obj)board/voiceblue/eeprom \ $(obj)board/armltd/{integratorap,integratorcp}/u-boot.lds \ $(obj)u-boot.lds \ - $(obj)arch/blackfin/cpu/bootrom-asm-offsets.[chs] + $(obj)arch/blackfin/cpu/bootrom-asm-offsets.[chs] \ + $(obj)arch/blackfin/cpu/init.{lds,elf} @rm -f $(obj)include/bmp_logo.h @rm -f $(obj)lib/asm-offsets.s @rm -f $(obj)nand_spl/{u-boot.lds,u-boot-spl,u-boot-spl.map,System.map} diff --git a/arch/blackfin/cpu/.gitignore b/arch/blackfin/cpu/.gitignore index 0ec9d56..ba986d8 100644 --- a/arch/blackfin/cpu/.gitignore +++ b/arch/blackfin/cpu/.gitignore @@ -1 +1,4 @@ bootrom-asm-offsets.[chs] + +init.lds +init.elf diff --git a/arch/blackfin/cpu/Makefile b/arch/blackfin/cpu/Makefile index df10f1b..5deaa9e 100644 --- a/arch/blackfin/cpu/Makefile +++ b/arch/blackfin/cpu/Makefile @@ -13,7 +13,7 @@ include $(TOPDIR)/config.mk
LIB = $(obj)lib$(CPU).o
-EXTRA := +EXTRA := init.elf CEXTRA := initcode.o SEXTRA := start.o SOBJS := interrupt.o cache.o @@ -61,6 +61,11 @@ ifneq ($(CONFIG_BFIN_BOOT_MODE),BFIN_BOOT_BYPASS) fi endif
+$(obj)init.lds: init.lds.S + $(CPP) $(CPPFLAGS) $(LDPPFLAGS) -ansi -D__ASSEMBLY__ -P $^ -o $@ +$(obj)init.elf: $(obj)init.lds $(obj)init.o $(obj)initcode.o + $(LD) $(LDFLAGS) -T $^ -o $@ + #########################################################################
# defines $(obj).depend target diff --git a/arch/blackfin/cpu/init.S b/arch/blackfin/cpu/init.S new file mode 100644 index 0000000..f48c113 --- /dev/null +++ b/arch/blackfin/cpu/init.S @@ -0,0 +1,9 @@ +#include <asm/blackfin.h> +ENTRY(_start) + sp.l = LO(L1_SRAM_SCRATCH_END - 20); + sp.h = HI(L1_SRAM_SCRATCH_END - 20); + call _initcode; +1: + emuexcpt; + jump 1b; +END(_start) diff --git a/arch/blackfin/cpu/init.lds.S b/arch/blackfin/cpu/init.lds.S new file mode 100644 index 0000000..602e7c8 --- /dev/null +++ b/arch/blackfin/cpu/init.lds.S @@ -0,0 +1,25 @@ +/* + * linker script for simple init.elf + * + * Copyright (c) 2005-2011 Analog Device Inc. + * + * Licensed under the GPL-2 or later. + */ + +#include <config.h> +#include <asm/blackfin.h> +#undef ALIGN +#undef ENTRY + +OUTPUT_ARCH(bfin) + +MEMORY +{ + l1_code : ORIGIN = L1_INST_SRAM, LENGTH = L1_INST_SRAM_SIZE +} + +ENTRY(_start) +SECTIONS +{ + .text.l1 : { *(.text .text.*) } >l1_code +}