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

[Marco Felsch]

On 23-10-20, Ahmad Fatoum wrote:
> On 20.10.23 15:03, Marco Felsch wrote:
> > 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).
> 
> I can't follow what you mean with "don't use the pblb (PBL only)",
> but the other three 8MQ boards already have a MAX_PBL_MEMORY_SIZE,
> so as far as this patch is concerned, there's nothing further to do.

Sorry for the confusion, they use ".imximg" instead of ".pimximg". Not
sure if this is correct and you're right they already do have the
MAX_PBL_MEMORY_SIZE defined. I just wanted to point out that not all
i.MX8MQ images do use the new macro.

Regards,
  Marco

> >> 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
> >>
> >>
> >>
> > 
> 
> -- 
> Pengutronix e.K.                           |                             |
> Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
> 31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
> Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |
> 
>