Re: [PATCH v2 18/21] riscv: link ELF image into PBL

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

On 1/6/26 1:53 PM, Sascha Hauer wrote:
> Instead of linking the raw binary barebox proper image into the PBL link
> the ELF image into the PBL. With this barebox proper starts with a properly
> linked and fully initialized C environment, so the calls to
> relocate_to_adr() and setup_c() can be removed from barebox proper.
> 
> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Reviewed-by: Ahmad Fatoum <a.fatoum@pengutronix.de>

> ---
>  arch/riscv/Kconfig           |  1 +
>  arch/riscv/boot/start.c      |  6 ------
>  arch/riscv/boot/uncompress.c | 21 ++++++++++++++++++++-
>  3 files changed, 21 insertions(+), 7 deletions(-)
> 
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index 96d013d8514ac12de5c34a426262d85f8cf021b9..d9794354f4ed2e8bf7276e03b968c566002c2ec6 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -17,6 +17,7 @@ config RISCV
>  	select HAS_KALLSYMS
>  	select RISCV_TIMER if RISCV_SBI
>  	select HW_HAS_PCI
> +	select PBL_IMAGE_ELF
>  	select HAVE_ARCH_BOARD_GENERIC_DT
>  	select HAVE_ARCH_BOOTM_OFTREE
>  
> diff --git a/arch/riscv/boot/start.c b/arch/riscv/boot/start.c
> index 5091340c8a374fc360ab732ba01ec8516e82a83d..002ab3eccb4292d8d88a95f8b93163c970cb1d64 100644
> --- a/arch/riscv/boot/start.c
> +++ b/arch/riscv/boot/start.c
> @@ -123,12 +123,6 @@ void barebox_non_pbl_start(unsigned long membase, unsigned long memsize,
>  	unsigned long barebox_size = barebox_image_size + MAX_BSS_SIZE;
>  	unsigned long barebox_base = riscv_mem_barebox_image(membase, endmem, barebox_size);
>  
> -	relocate_to_current_adr();
> -
> -	setup_c();
> -
> -	barrier();
> -
>  	irq_init_vector(riscv_mode());
>  
>  	pr_debug("memory at 0x%08lx, size 0x%08lx\n", membase, memsize);
> diff --git a/arch/riscv/boot/uncompress.c b/arch/riscv/boot/uncompress.c
> index 84142acf9c66fe1fcceb6ae63d15ac078ccddee7..fba04cf4fb6ed450d80b83a8a595346a3186f1e7 100644
> --- a/arch/riscv/boot/uncompress.c
> +++ b/arch/riscv/boot/uncompress.c
> @@ -32,6 +32,8 @@ void __noreturn barebox_pbl_start(unsigned long membase, unsigned long memsize,
>  	unsigned long barebox_base;
>  	void *pg_start, *pg_end;
>  	unsigned long pc = get_pc();
> +	struct elf_image elf;
> +	int ret;
>  
>  	irq_init_vector(riscv_mode());
>  
> @@ -68,7 +70,24 @@ void __noreturn barebox_pbl_start(unsigned long membase, unsigned long memsize,
>  
>  	sync_caches_for_execution();
>  
> -	barebox = (void *)barebox_base;
> +	ret = elf_open_binary_into(&elf, (void *)barebox_base);
> +	if (ret) {
> +		pr_err("Failed to open ELF binary: %d\n", ret);
> +		hang();
> +	}
> +
> +	ret = elf_load_inplace(&elf);
> +	if (ret) {
> +		pr_err("Failed to relocate ELF: %d\n", ret);
> +		hang();
> +	}
> +
> +	/*
> +	 * TODO: Add pbl_mmu_setup_from_elf() call when RISC-V PBL
> +	 * MMU support is implemented, similar to ARM
> +	 */
> +
> +	barebox = (void *)elf.entry;
>  
>  	pr_debug("jumping to uncompressed image at 0x%p. dtb=0x%p\n", barebox, fdt);
>  
> 

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