[PATCH] ARM: i.MX8M: limit PBL size to 0x3f000

[Marco Felsch]

On 23-10-20, Ahmad Fatoum wrote:
> On i.MX8M(Q/M/N/P), barebox PBL is loaded 0x1000 bytes into ITCM

Nit: only the i.MX8MQ-EVK was converted. Don't know if the rest is
broken since they don't use the pblb (PBL only).

> at address 0x7e00_1000. ITCM is 128K followed by 128K of DTCM.
> 
> Therefore, in total, barebox PBL may not exceed 0x3f000. Now that we
> have a common macro for defining boards, let's add a
> MAX_PBL_MEMORY_SIZE_$(entrypoint) into it, so check that we don't
> exceed this size at runtime.
> 
> Boards that trip over this, should consider using get_builtin_firmware_ext
> to offload binaries into barebox proper.
> 
> Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>

Reviewed-by: Marco Felsch <m.felsch at pengutronix.de>

> ---
>  images/Makefile.imx | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/images/Makefile.imx b/images/Makefile.imx
> index 50f0a64b3091..ca09853c4b6e 100644
> --- a/images/Makefile.imx
> +++ b/images/Makefile.imx
> @@ -26,6 +26,7 @@ $(eval
>  ifeq ($($(strip $(1))), y)
>  	pblb-y += $(strip $(2))
>  	CFG_$(strip $(2)).pblb.imximg = $(board)/$(strip $(3)).imxcfg
> +	MAX_PBL_MEMORY_SIZE_$(strip $(2)) = 0x3f000
>  	FILE_barebox-$(strip $(4)).img    = $(strip $(2)).pblb.pimximg
>  	FILE_barebox-$(strip $(4))-s.img  = $(strip $(2)).pblb.psimximg
>  	image-y += barebox-$(strip $(4)).img
> -- 
> 2.39.2
> 
> 
>