[U-Boot] [PATCH 8/8] mips: bmips: add support for raw .elf images

["Álvaro Fernández Rojas" <noltari@gmail.com>]

Hi,

El 15/04/2017 a las 19:19, Álvaro Fernández Rojas escribió:
> 
> 
> El 14/04/2017 a las 21:05, Daniel Schwierzeck escribió:
>>
>>
>> Am 13.04.2017 um 17:52 schrieb Álvaro Fernández Rojas:
>>> CFE supports loading .elf images instead of raw binaries.
>>>
>>> Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
>>> ---
>>>  Makefile                     | 22 ++++++++++++++++++++++
>>>  arch/mips/cpu/u-boot-elf.lds | 10 ++++++++++
>>>  2 files changed, 32 insertions(+)
>>>  create mode 100644 arch/mips/cpu/u-boot-elf.lds
>>>
>>> diff --git a/Makefile b/Makefile
>>> index 09b597d..667b5f2 100644
>>> --- a/Makefile
>>> +++ b/Makefile
>>> @@ -568,6 +568,15 @@ ifndef LDSCRIPT
>>>  	endif
>>>  endif
>>>  
>>> +ifndef LDSCRIPT_ELF
>>> +	ifeq ($(wildcard $(LDSCRIPT_ELF)),)
>>> +		LDSCRIPT_ELF := $(srctree)/$(CPUDIR)/u-boot-elf.lds
>>> +	endif
>>> +	ifeq ($(wildcard $(LDSCRIPT_ELF)),)
>>> +		LDSCRIPT_ELF := $(srctree)/arch/$(ARCH)/cpu/u-boot-elf.lds
>>> +	endif
>>> +endif
>>
>> could you try to build the ELF binary without a custom linker script? I
>> think the built-in one should work too.
>>
>>> +
>>>  else
>>>  # Dummy target needed, because used as prerequisite
>>>  include/config/auto.conf: ;
>>> @@ -786,6 +795,7 @@ ifneq ($(CONFIG_SPL_TARGET),)
>>>  ALL-$(CONFIG_SPL) += $(CONFIG_SPL_TARGET:"%"=%)
>>>  endif
>>>  ALL-$(CONFIG_REMAKE_ELF) += u-boot.elf
>>> +ALL-$(CONFIG_ARCH_BMIPS) += u-boot-bmips.elf
>>>  ALL-$(CONFIG_EFI_APP) += u-boot-app.efi
>>>  ALL-$(CONFIG_EFI_STUB) += u-boot-payload.efi
>>>  
>>> @@ -1192,6 +1202,15 @@ u-boot.elf: u-boot.bin
>>>  		--defsym=_start=$(CONFIG_SYS_TEXT_BASE) \
>>>  		-Ttext=$(CONFIG_SYS_TEXT_BASE)
>>>  
>>> +# Rules to link u-boot-bmips
>>> +quiet_cmd_u-boot-bmips ?= LD      $@
>>> +	cmd_u-boot-bmips ?= $(LD) -e startup -T u-boot-elf.lds \
>>> +	-Ttext $(CONFIG_SYS_TEXT_BASE) -o $@ u-boot-bmips.o
>>> +
>>> +u-boot-bmips.elf: u-boot.bin u-boot-elf.lds
>>> +	$(Q)$(LD) -r -b binary --oformat elf32-tradbigmips -o u-boot-bmips.o $<
>>> +	$(call if_changed,u-boot-bmips)
>>
>> could you try to generate the ELF binary like in the existing rule
>> above? If that works, we could refactor the generic rule to remove the
>> hard-coded aarch64 flags. If not, move this code and the
>> "ALL-$(CONFIG_ARCH_BMIPS) += u-boot-bmips.elf" to arch/mips/Makefile
> Sure, I will try and see if it works.
It works, but it has to be changed:
u-boot.elf: u-boot.bin
	@$(OBJCOPY) -B mips -I binary -O elf32-tradbigmips \
		$< u-boot-elf.o
	@$(LD) u-boot-elf.o -o $@ \
		--defsym=__start=$(CONFIG_SYS_TEXT_BASE) \
		-Ttext=$(CONFIG_SYS_TEXT_BASE)
Changes:
1) __start symbol instead of _start
2) mips instead of aarch64
3) elf32-tradbigmips instead of elf64-littleaarch64

> 
>>
>> Also don't forget to add new binaries to .gitignore and the Makefile
>> clean targets.
> Right, my fault :).
> 
>>
>>> +
>>>  # Rule to link u-boot
>>>  # May be overridden by arch/$(ARCH)/config.mk
>>>  quiet_cmd_u-boot__ ?= LD      $@
>>> @@ -1340,6 +1359,9 @@ cmd_cpp_lds = $(CPP) -Wp,-MD,$(depfile) $(cpp_flags) $(LDPPFLAGS) \
>>>  u-boot.lds: $(LDSCRIPT) prepare FORCE
>>>  	$(call if_changed_dep,cpp_lds)
>>>  
>>> +u-boot-elf.lds: $(LDSCRIPT_ELF) prepare
>>> +	$(call if_changed_dep,cpp_lds)
>>> +
>>>  spl/u-boot-spl.bin: spl/u-boot-spl
>>>  	@:
>>>  spl/u-boot-spl: tools prepare \
>>> diff --git a/arch/mips/cpu/u-boot-elf.lds b/arch/mips/cpu/u-boot-elf.lds
>>> new file mode 100644
>>> index 0000000..db0bb46
>>> --- /dev/null
>>> +++ b/arch/mips/cpu/u-boot-elf.lds
>>> @@ -0,0 +1,10 @@
>>> +OUTPUT_ARCH(mips)
>>> +SECTIONS {
>>> +	.text : {
>>> +		startup = .;
>>> +		*(.text)
>>> +		*(.text.*)
>>> +		*(.data)
>>> +		*(.data.*)
>>> +	}
>>> +}
>>>
>>