Boot failure after QEMU's upgrade to OpenSBI v1.3 (was Re: [PATCH for-8.2 6/7] target/riscv: add 'max' CPU type)

[Conor Dooley]

On Fri, Jul 14, 2023 at 10:00:19AM +0530, Anup Patel wrote:

> > > OpenSBI v1.3
> > >    ____                    _____ ____ _____
> > >   / __ \                  / ____|  _ \_   _|
> > >  | |  | |_ __   ___ _ __ | (___ | |_) || |
> > >  | |  | | '_ \ / _ \ '_ \ \___ \|  _ < | |
> > >  | |__| | |_) |  __/ | | |____) | |_) || |_
> > >   \____/| .__/ \___|_| |_|_____/|___/_____|
> > >         | |
> > >         |_|
> > >
> > > init_coldboot: ipi init failed (error -1009)
> > >
> > > Just to note, because we use our own firmware that vendors in OpenSBI
> > > and compiles only a significantly cut down number of files from it, we
> > > do not use the fw_dynamic etc flow on our hardware. As a result, we have
> > > not tested v1.3, nor do we have any immediate plans to change our
> > > platform firmware to vendor v1.3 either.
> > >
> > > I unless there's something obvious to you, it sounds like I will need to
> > > go and bisect OpenSBI. That's a job for another day though, given the
> > > time.
> > >
> 
> The real issue is some CPU/HART DT nodes marked as disabled in the
> DT passed to OpenSBI 1.3.
> 
> This issue does not exist in any of the DTs generated by QEMU but some
> of the DTs in the kernel (such as microchip and SiFive board DTs) have
> the E-core disabled.
> 
> I had discovered this issue in a totally different context after the OpenSBI 1.3
> release happened. This issue is already fixed in the latest OpenSBI by the
> following commit c6a35733b74aeff612398f274ed19a74f81d1f37 ("lib: utils:
> Fix sbi_hartid_to_scratch() usage in ACLINT drivers").

Great, thanks Anup! I thought I had tested tip-of-tree too, but
obviously not.

> I always assumed that Microchip hss.bin is the preferred BIOS for the
> QEMU microchip-icicle-kit machine but I guess that's not true.

Unfortunately the HSS has not worked in QEMU for a long time, and while
I would love to fix it, but am pretty stretched for spare time to begin
with.
I usually just do direct kernel boots, which use the OpenSBI that comes
with QEMU, as I am sure you already know :)

> At this point, you can either:
> 1) Use latest OpenSBI on QEMU microchip-icicle-kit machine

> 2) Ensure CPU0 DT node is enabled in DT when booting on QEMU
>     microchip-icicle-kit machine with OpenSBI 1.3

Will OpenSBI disable it? If not, I think option 2) needs to be remove
the DT node. I'll just use tip-of-tree myself & up to the 
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