rk3188 (radxa rock pro) boot failure w/ barebox 2018-04 and later

Sascha Hauer s.hauer at pengutronix.de
Sun Sep 16 23:37:41 PDT 2018


Hi,

On Fri, Sep 14, 2018 at 09:20:04PM +0300, Панов Андрей wrote:
> Hi!
> 
> Attached patch fixed the problem.
> 
> in arch/arm/cpu/uncompress.c global_variable_offset() was called before relocation.
> 
> And we have TEXT_BASE = 0 (since CONFIG_*_RELOCATABLE is set and it is not configurable)
> 
> Arch memory starts at 0x60000000 and image linked at 0x0, so global_variable_offset() returns 0x60000000
> 
> We're running around 0x60000000 and at
>        image_end = (void *)&image_end_marker + global_variable_offset();
> &image_end_marker is 0x6000XXXXX
> image_end goes at 0x60000000 more than it is actually
> 
> After relocation global_variable_offset() becomes zero.
> 
> So if we move 
>        image_end = (void *)&image_end_marker + global_variable_offset();
> after relocation it will point to right location.

This patch only works for CONFIG_PBL_RELOCATABLE enabled. If it's not
enabled, then we will move the binary to its link address, but not the
compressed image behind the binary. After that image_end is correctly
calculated to the address behind the new image, but there's only
garbage.

I have a patch in preparation I'll post shortly.

Sascha

> diff --git a/arch/arm/cpu/uncompress.c b/arch/arm/cpu/uncompress.c
> index b07087e4c..708c04c1f 100644
> --- a/arch/arm/cpu/uncompress.c
> +++ b/arch/arm/cpu/uncompress.c
> @@ -50,8 +50,6 @@ void __noreturn barebox_multi_pbl_start(unsigned long membase,
>         void *pg_start;
>         unsigned long pc = get_pc();
>  
> -       image_end = (void *)&image_end_marker + global_variable_offset();
> -
>         if (IS_ENABLED(CONFIG_PBL_RELOCATABLE)) {
>                 /*
>                  * If we run from inside the memory just relocate the binary
> @@ -64,6 +62,8 @@ void __noreturn barebox_multi_pbl_start(unsigned long membase,
>                         relocate_to_adr(membase);
>         }
>  
> +       image_end = (void *)&image_end_marker + global_variable_offset();
> +
>         /*
>          * image_end is the image_end_marker defined above. It is the last location
>          * in the executable. Right after the executable the build process adds
> 
> 

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