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

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Message-ID: <86zhn54myw.fsf@baylibre.com>
Date:   Wed, 29 May 2019 11:41:11 +0200
From:   Loys Ollivier <lollivier@...libre.com>
To:     Karsten Merker <merker@...ian.org>
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 28 May 2019 at 17:35, Karsten Merker <merker@...ian.org> wrote:

> 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.
>

Hello Karsten,
That was it ! This fixes the issue I had on init execution.
Good catch, thanks a lot for the help !

Regards,
Loys


> Regards,
> Karsten
> -- 
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