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

[Marek Vasut]

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 ?