[PATCH v3] board_f.c: Insure gd->new_bootstage alignment

[Patrick DELAUNAY]

Hi Tom,

> From: Patrice CHOTARD <patrice.chotard at st.com>
> Sent: mercredi 27 novembre 2019 10:12
> 
> In reserve_bootstage(), in case size is odd, gd->new_bootstage is not aligned. In
> bootstage_relocate(), the platform hangs when getting access to data-
> >record[i].name.
> To avoid this issue, make gd->new_bootstage 16 byte aligned.
> 
> To insure that new_bootstage is 16 byte aligned (at least needed for
> x86_64 and ARMv8) and new_bootstage starts down to get enough space,
> ALIGN_DOWN macro is used.
> 
> Fixes: ac9cd4805c8b ("bootstage: Correct relocation algorithm")
> 
> Signed-off-by: Patrice Chotard <patrice.chotard at st.com>
> Reviewed-by: Vikas MANOCHA <vikas.manocha at st.com>
> Reviewed-by: Patrick Delaunay <patrick.delaunay at st.com>
> Tested-by: Patrick Delaunay <patrick.delaunay at st.com>
> 

Do you plan to merge this fixe for the next rc for v2020.01 ?
Or do you expect some change / review.

This patch is mandatory for stm32mp1 (ARM plaform with bootstage feature activated).
Without this patch, the boot failed (at least for v2020.01-rc3 : crash has struct pointer new_bootstage is not aligned).

Or I will deactivate the BOOTSTAGE feature...

Thanks 

Patrick

> ---
> 
> Changes in v3:
>   - Add Patrick Reviewed-by and Tested-by.
> 
> Changes in v2:
>   - Update comment to explain the ALIGN_DOWN() usage.
> 
>  common/board_f.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/common/board_f.c b/common/board_f.c index e3591cbaeb..d367f6b044
> 100644
> --- a/common/board_f.c
> +++ b/common/board_f.c
> @@ -559,6 +559,11 @@ static int reserve_bootstage(void)
>  	int size = bootstage_get_size();
> 
>  	gd->start_addr_sp -= size;
> +	/*
> +	 * Insure that start_addr_sp is aligned down to reserve enough
> +	 * space for new_bootstage
> +	 */
> +	gd->start_addr_sp = ALIGN_DOWN(gd->start_addr_sp, 16);
>  	gd->new_bootstage = map_sysmem(gd->start_addr_sp, size);
>  	debug("Reserving %#x Bytes for bootstage at: %08lx\n", size,
>  	      gd->start_addr_sp);
> --
> 2.17.1