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

[Marek Vasut]

On 10/28/25 4:36 PM, Tom Rini wrote:
> 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?
I added documentation in V3 now.

As for CI testing, I recall the infrastructure is not there yet.