[U-Boot] [PATCH] ARM: provide a valid exception stack address for startup code

[Simon Glass]

On 8 June 2017 at 02:16, Lothar Waßmann <LW at karo-electronics.de> wrote:
> Create exception stack in IRAM if available to facilitate debugging of
> pre-relocation code by catching exceptions rather than stopping dead.
>
> Signed-off-by: Lothar Waßmann <LW at KARO-electronics.de>
> ---
>  arch/arm/lib/vectors.S | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)

Reviewed-by: Simon Glass <sjg at chromium.org>

But please see below.

>
> diff --git a/arch/arm/lib/vectors.S b/arch/arm/lib/vectors.S
> index f53b1e9..1019091 100644
> --- a/arch/arm/lib/vectors.S
> +++ b/arch/arm/lib/vectors.S
> @@ -117,7 +117,6 @@ data_abort:
>  not_used:
>  irq:
>  fiq:
> -

What is this?

>  1:
>         bl      1b                      /* hang and never return */
>
> @@ -126,7 +125,11 @@ fiq:
>  /* IRQ stack memory (calculated at run-time) + 8 bytes */
>  .globl IRQ_STACK_START_IN
>  IRQ_STACK_START_IN:
> +#ifdef IRAM_BASE_ADDR
> +       .word   IRAM_BASE_ADDR + 0x20
> +#else
>         .word   0x0badc0de
> +#endif
>
>  @
>  @ IRQ stack frame.
> --
> 2.1.4
>