linux-kernel - Re: Testing the recent RISC-V DT patchsets

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Date:   Tue, 28 May 2019 17:35:42 +0200
From:   Karsten Merker <merker@...ian.org>
To:     Loys Ollivier <lollivier@...libre.com>
Cc:     Paul Walmsley <paul.walmsley@...ive.com>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: Testing the recent RISC-V DT patchsets

On Tue, May 28, 2019 at 05:10:42PM +0200, Loys Ollivier wrote:
> On Tue 28 May 2019 at 01:32, Paul Walmsley <paul.walmsley@...ive.com> wrote:
> 
> > An update for those testing RISC-V patches: here's a new branch of 
> > riscv-pk/bbl that doesn't try to read or modify the DT data at all, which 
> > should be useful until U-Boot settles down.
[...]
> > Here is an Linux kernel branch with updated DT data that can be booted 
> > with the above bootloader:
> >
> >    https://github.com/sifive/riscv-linux/tree/dev/paulw/dts-v5.2-rc1-experimental
> >
> > A sample boot log follows, using a 'defconfig' build from that branch.  
> 
> Thanks Paul, I can confirm that it works.
> 
> Something is still unclear to myself.
> Using FSBL + riscv-pk/bbl the linux kernel + device tree boots.
> Neither FSBL nor riscv-pk/bbl are modifying the DT.
> 
> Using FSBL + OpenSBI + U-Boot the same kernel + device tree hangs on
> running /init.
> 
> Would you have any pointer on what riscv-pk does that OpenSBI/U-boot doesn't ?
> Or maybe it is the other way around - OpenSBI/U-boot does something that
> extra that should not happen.

Hello,

I don't know which version of OpenSBI you are using, but there is
a problem with the combination of kernel 5.2-rc1 and OpenSBI
versions before commit

  https://github.com/riscv/opensbi/commit/4e2cd478208531c47343290f15b577d40c82649c

that can result in a hang on executing init, so in case you
should be using an older OpenSBI build that might be the source
of the problem that you are experiencing.

Regards,
Karsten
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