Hi Simon, On Thu, 17 Apr 2025 at 21:16, Simon Glass <s...@chromium.org> wrote: > > Accept a bloblist and control devicetree from a previous phase in > registers 0 to 3, as documented in the Firmware Handoff > specification[1]. > > [1] https://firmwarehandoff.github.io/firmware_handoff/main/index.html > > Signed-off-by: Simon Glass <s...@chromium.org> > --- > > Changes in v3: > - Add support for aarch64 also > - Update registers to match the Firmware Handoff protocol > > Changes in v2: > - Use three registers instead of two for the entry
[...] > --- a/arch/arm/cpu/armv8/start.S > +++ b/arch/arm/cpu/armv8/start.S > @@ -57,6 +57,18 @@ reset: > b save_boot_params > .globl save_boot_params_ret > save_boot_params_ret: > +#if CONFIG_IS_ENABLED(PASSAGE_IN) > + # Keep passage information in case it is provided > + cmp x2, #0 > + bne no_passage > + mov x19, x1 /* mach */ > + mov x20, x0 /* dtb */ > + mov x21, x3 /* bloblist */ Those are already stored in saved_args. Can you explain on the commit message why you need to preserve them in x19-x21 as well? [...] /Ilias
