[meta-xilinx] SPL->ATF->Linux

[Peter Smith]

I have been following along with interest, do you know if this would work
if we wanted to load Xen i.e. to boot a Xen Dom0?
Best Regards
Peter


On Fri, 14 Jun 2019 at 08:36, Michal Simek <michal.simek at xilinx.com> wrote:

> On 13. 06. 19 17:22, Jean-Francois Dagenais wrote:
> > Thanks Michal!
> >
> > This is awesome. I can certainly use this. Please review my assumptions
> below...
> >
> >> On Jun 12, 2019, at 07:39, Michal Simek <michal.simek at xilinx.com>
> wrote:
> >>
> >> Create bif like this.
> >> Image - one partition load addr 0x80000 as data
> >> dtb - one partition load addr 0x100000000 as data
> >>
> >> ATF - one partition (as today) EL3
> >> Trampoline code below() EL2-ns with filled kernel start to 0x80000 and
> >> dtb at 0x100000000
> >>
> >> fsbl starts ATF and it will pass handoff structure and primary program
> >> will be trampoline executed in EL2 which will just pass proper arguments
> >> to kernel.
> >
> >
> > So in essence, the program below becomes a standalone binary file which
> > essentially replaces "u-boot.bin" correct? Let's call it linux-boot.bin
> > (inspired by comment in code below).
> >
> > This would mean that boot.bin file must contain linux-boot.bin so FSBL
> loads it
> > to RAM prior to passing execution to ATF. If correct, linux-boot.bin
> must be
> > loaded at 0xfffc8000 (if following the example below), correct?
> >
> > If I understand all this correctly, I could either use FSBL with a
> boot.bin
> > containing basically everything needed to boot up to the kernel,
> including
> > linux-boot.bin. Or I could use SPL inside an u-boot's mkimage made
> boot.bin
> > configured to load a FIT image containing atf,
> linux-boot.bin,kernelImage,dtb ?
> >
> > If I understand FIT correctly, it is basically a "better", more straight
> forward
> > way to load multiples binaries into RAM rather than messing with
> > CONFIG_SPL_FS_LOAD_ARGS_NAME, CONFIG_SYS_SPL_ARGS_ADDR,
> > CONFIG_SPL_FS_LOAD_KERNEL_NAME and CONFIG_SPL_FS_LOAD_PAYLOAD_NAME...
> correct?
>
> If you want to boot just linux without u-boot you can simply run
> FSBL->ATF->linux-boot.bin->Linux. That's what I have described in
> previous email. And I would put linux-boot.bin to RAM out of Linux image.
>
> And sure you can use SPL instead of FSBL which likely don't need to use
> any trampoline code (linux-boot.bin). If this is packed in FIT I also
> think that you don't need to use any trampoline for booting. But I
> didn't test it to be 100% sure.
>
> Thanks,
> Michal
>
>
>
>
>
> --
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