[PATCH v2 1/2] ARM: bootm: Add support for starting Linux through OpTee-OS on ARMv7a

[Tom Rini]

On Tue, Oct 28, 2025 at 04:11:38PM +0100, Marek Vasut wrote:
> On 6/30/25 9:47 PM, Tom Rini wrote:
> > On Mon, Jun 30, 2025 at 07:18:33AM +0200, Heinrich Schuchardt wrote:
> > > Am 30. Juni 2025 02:08:05 MESZ schrieb Marek Vasut <marek.vasut at mailbox.org>:
> > > > Add support for jumping to Linux kernel through OpTee-OS on ARMv7a.
> > > > This is only supported if U-Boot runs in PL1 secure. This change adds
> > > > two components, one is fitImage OpTee-OS loadable handler, which makes
> > > > a note of OpTee-OS being loaded and stores the load address for later
> > > > jump to it. The second part is the actual jump to Linux through OpTee-OS.
> > > > The jump through OpTee-OS requires set up of multiple CPU registers, r1
> > > > and r2 are passed through, r0 and r3 have to be set to 0, lr is set to
> > > > Linux kernel entry point. This setup is done by new assembler function
> > > > boot_jump_linux_via_optee().
> > > > 
> > > > The boot_jump_linux_via_optee() also includes STM32MP13xx late TZC
> > > > configuration write, this cannot be moved easily, hence the ifdef.
> > > 
> > > Hello Marek,
> > > 
> > > Could you, please, add a documentation change to the series. This would allow reviewers to test your proposal.
> > > 
> > > Furthermore, please, provide tests on QEMU.
> > 
> > Documentation is good, also wiring up this use case for testing in CI
> > via QEMU is a rather large ask. We're still on needing a general boot OS
> > test or two in CI (and Ilias noted either on a call or IRC, I forget
> > now, that there's been some progress on making up a small enough generic
> > OS image to work from).
> I would really like these two patches to land, it is the remaining piece I
> need to make STM32MP13xx usable with pure U-Boot. How can we proceed here ?

There was some minor rewording requested, and adding documentation is
also good. We can't reasonably add CI testing here at this time, yes?

-- 
Tom
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