[PATCH v2 00/28] Implement ACPI on aarch64

[Tom Rini]

On Fri, Sep 06, 2024 at 02:00:57PM -0600, Simon Glass wrote:
> Hi Patrick,
> 
> On Fri, 6 Sept 2024 at 01:22, Patrick Rudolph
> <patrick.rudolph at 9elements.com> wrote:
> >
> > Based on the existing work done by Simon Glass this series adds
> > support for booting aarch64 devices using ACPI only.
> > As first target QEMU SBSA support is added, which relies on ACPI
> > only to boot an OS. As secondary target the Raspberry Pi4 was used,
> > which is broadly available and allows easy testing of the proposed
> > solution.
> >
> > The series is split into ACPI cleanups and code movements, adding
> > Arm specific ACPI tables and finally SoC and mainboard related
> > changes to boot a Linux on the QEMU SBSA and RPi4. Currently only the
> > mandatory ACPI tables are supported, allowing to boot into Linux
> > without errors.
> >
> > The QEMU SBSA support is feature complete and provides the same
> > functionality as the EDK2 implementation.
> >
> > The changes were tested on real hardware as well on QEMU v9.0:
> >
> > qemu-system-aarch64 -machine sbsa-ref -nographic -cpu cortex-a57 \
> >                     -pflash secure-world.rom \
> >                     -pflash unsecure-world.rom
> >
> > qemu-system-aarch64 -machine raspi4b -kernel u-boot.bin -cpu cortex-a72 \
> > -smp 4 -m 2G -drive file=raspbian.img,format=raw,index=0 \
> > -dtb bcm2711-rpi-4-b.dtb -nographic
> >
> > Please note that the current implementation still requires a DTB to be
> 
> The word 'still' suggests that it won't one day. But U-Boot uses
> devicetree for its configuration so this will always be the case. I
> suggest removing 'still'.

Pointing over at x86 where we have dts files, yes, please remove the
word "still" and perhaps otherwise reword a few things. U-Boot is happy
to pass along ACPI and so forth to the OS, but will continue using
device tree internally.

-- 
Tom
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