[PATCH] board: ea: mx7ulp_com: allocate specific region of memory to OP-TEE

[Tom Rini]

On Wed, Aug 25, 2021 at 06:35:05PM +0300, Oleksandr Suvorov wrote:
> Hi Tom,
> 
> 
> On Wed, Aug 25, 2021 at 4:46 PM Tom Rini <trini at konsulko.com> wrote:
> >
> > On Wed, Aug 25, 2021 at 04:22:55PM +0300, Oleksandr Suvorov wrote:
> >
> > > From: Ricardo Salveti <ricardo at foundries.io>
> > >
> > > On the iMX7ULP uCOM board, OP-TEE uses the memory region defined by the
> > > maximum DRAM address minus CONFIG_OPTEE_TZDRAM_SIZE, so subtract
> > > CONFIG_OPTEE_TZDRAM_SIZE from the available DRAM size to avoid
> > > conflicts.
> > >
> > > Note the OPTEE boot process itself subtracts the DRAM region it
> > > lives in from the memory map passed to Linux.
> >
> > Is this something true of all OP-TEE?  All OP-TEE on ARMv7?  All OP-TEE
> > on i.MX7?  I'm asking since currently this hook is done the exact same
> > way on a few other i.MX7 boards, and nowhere else.  That says to me we
> > should probably move this hook up somewhere, perhaps to imx_ddr_size()
> > and poke the boards that aren't using that today to use it.
> 
> Shortly, no. There are different solutions for different boards and
> they seem not
> vendor-specific. Say, solutions for both stm32mp1 and zynqmp boards use fdt's
> reserve memory section to avoid conflicts with the OP-TEE memory region.
> We're thinking about providing a generic solution, but it will take
> some time and
> can't be done right now.

So it's board-specific up at the OP-TEE level?  OK, sigh.  This is fine
then.  Thanks.

-- 
Tom
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 659 bytes
Desc: not available
URL: <https://lists.denx.de/pipermail/u-boot/attachments/20210825/d4a56882/attachment.sig>