[PATCH v2 01/10] Makefile: add SPL_REMAKE_ELF_LDSCRIPT feature

[Tom Rini]

On Sat, Apr 11, 2026 at 02:00:06AM +0200, michael.srba at seznam.cz wrote:

> From: Michael Srba <Michael.Srba at seznam.cz>
> 
> On some platforms (at least Qualcomm), the bootrom expects an ELF file.
> Since the contents of the ELF file are platform specific, add a config
> option that allows specifying a linker script to use to produce the
> ELF file.
> 
> Signed-off-by: Michael Srba <Michael.Srba at seznam.cz>
> ---
>  Makefile           | 28 ++++++++++++++++++++++++++++
>  common/spl/Kconfig |  9 +++++++++
>  2 files changed, 37 insertions(+)
> 
> diff --git a/Makefile b/Makefile
> index 8af18668b0f..754ca4d67e2 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -1232,6 +1232,9 @@ INPUTS-$(CONFIG_SPL) += $(CONFIG_SPL_TARGET:"%"=%)
>  endif
>  INPUTS-$(CONFIG_REMAKE_ELF) += u-boot.elf
>  INPUTS-$(CONFIG_SPL_REMAKE_ELF) += spl/u-boot-spl.elf
> +ifneq ($(CONFIG_SPL_REMAKE_ELF_LDSCRIPT),)
> +INPUTS-y += spl/u-boot-spl.elf
> +endif
>  INPUTS-$(CONFIG_EFI_APP) += u-boot-app.efi
>  INPUTS-$(CONFIG_EFI_STUB) += u-boot-payload.efi
>  
> @@ -2001,6 +2004,8 @@ u-boot.elf: u-boot.bin u-boot-elf.lds FORCE
>  	$(Q)$(OBJCOPY) -I binary $(PLATFORM_ELFFLAGS) $< u-boot-elf.o
>  	$(call if_changed,u-boot-elf)
>  
> +ifeq ($(CONFIG_SPL_REMAKE_ELF_LDSCRIPT),)
> +
>  quiet_cmd_u-boot-spl-elf ?= LD      $@
>  	cmd_u-boot-spl-elf ?= $(LD) spl/u-boot-spl-elf.o -o $@ \
>  	$(if $(CONFIG_SYS_BIG_ENDIAN),-EB,-EL) \
> @@ -2010,10 +2015,33 @@ spl/u-boot-spl.elf: spl/u-boot-spl.bin u-boot-elf.lds
>  	$(Q)$(OBJCOPY) -I binary $(PLATFORM_ELFFLAGS) $< spl/u-boot-spl-elf.o
>  	$(call if_changed,u-boot-spl-elf)
>  
> +endif
> +
>  u-boot-elf.lds: arch/u-boot-elf.lds prepare FORCE
>  	$(call if_changed_dep,cpp_lds)
>  
>  PHONY += prepare0
> +
> +ifeq ($(CONFIG_SPL),y)
> +ifneq ($(CONFIG_SPL_REMAKE_ELF_LDSCRIPT),)
> +
> +SPL_REMAKE_ELF_LDSCRIPT := $(addprefix $(srctree)/,$(CONFIG_SPL_REMAKE_ELF_LDSCRIPT:"%"=%))
> +
> +spl/u-boot-spl-elf.lds: $(SPL_REMAKE_ELF_LDSCRIPT) FORCE
> +	$(call if_changed_dep,cpp_lds)
> +
> +quiet_cmd_u-boot-spl-elf ?= LD      $@
> +	cmd_u-boot-spl-elf ?= $(LD) spl/u-boot-spl-elf.o -o $@ \
> +	$(if $(CONFIG_SYS_BIG_ENDIAN),-EB,-EL) \
> +	-T spl/u-boot-spl-elf.lds --defsym=$(CONFIG_PLATFORM_ELFENTRY)=$(CONFIG_SPL_TEXT_BASE) \
> +	-Ttext=$(CONFIG_SPL_TEXT_BASE) -z max-page-size=0x1000
> +spl/u-boot-spl.elf: spl/u-boot-spl.bin spl/u-boot-spl-elf.lds
> +	$(Q)$(OBJCOPY) -I binary $(PLATFORM_ELFFLAGS) $< spl/u-boot-spl-elf.o
> +	$(call if_changed,u-boot-spl-elf)
> +
> +endif
> +endif
> +
>  # MediaTek's ARM-based u-boot needs a header to contains its load address
>  # which is parsed by the BootROM.
>  # If the SPL build is enabled, the header will be added to the spl binary,
> diff --git a/common/spl/Kconfig b/common/spl/Kconfig
> index d1a85f50209..f8981cb4fe5 100644
> --- a/common/spl/Kconfig
> +++ b/common/spl/Kconfig
> @@ -247,6 +247,15 @@ config SPL_HANDOFF
>  	  proper. Also SPL can receive information from TPL in the same place
>  	  if that is enabled.
>  
> +config SPL_REMAKE_ELF_LDSCRIPT
> +	string "Linker script to run with u-boot-spl.bin as input"
> +	depends on !SPL_REMAKE_ELF
> +	help
> +	  This allows specifying a linker script that will act on u-boot-spl.bin.
> +	  Some platforms (e.g Qualcomm) use the ELF format in creative ways,
> +	  including in the bootrom. Unlike SPL_REMAKE_ELF which uses a standard
> +	  linker script, this allows specifying a platorm-specific one.

This is starting to get a little odd. I think we need a pre-requisite
series to cleanup the remake elf logic, so that:
- The lds used is configured in Kconfig (and the default is the current
  one everyone else uses).
  - If we can have different ones for full U-Boot, or SPL
- The Makefile has a broken out the logic for doing the relink itself.

-- 
Tom
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