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 for <linuxppc-dev@lists.ozlabs.org>; Fri,  4 Nov 2016 19:05:51 +1100 (AEDT)
From: Andreas Schwab <schwab@linux-m68k.org>
To: Paul Burton <paul.burton@imgtec.com>
Cc: Larry Finger <Larry.Finger@lwfinger.net>,
 Michael Ellerman <mpe@ellerman.id.au>,
 Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
 Andrew Morton <akpm@linux-foundation.org>, Borislav Petkov <bp@suse.de>,
 Petr Mladek <pmladek@suse.com>, Tejun Heo <tj@kernel.org>,
 <linux-kernel@vger.kernel.org>, <linuxppc-dev@lists.ozlabs.org>
Subject: Re: [PATCH v3] console: use first console if stdout-path device
 doesn't appear
References: <2c67e39b-fc33-918a-774e-d9238e837c03@lwfinger.net>
 <20161103125758.3415-1-paul.burton@imgtec.com>
Date: Fri, 04 Nov 2016 09:05:38 +0100
In-Reply-To: <20161103125758.3415-1-paul.burton@imgtec.com> (Paul Burton's
 message of "Thu, 3 Nov 2016 12:57:58 +0000")
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On Nov 03 2016, Paul Burton <paul.burton@imgtec.com> wrote:

> If a device tree specified a preferred device for kernel console output
> via the stdout-path or linux,stdout-path chosen node properties there's
> no guarantee that it will have specified a device for which we have a
> driver. It may also be the case that we do have a driver but it doesn't
> call of_console_check() to register as a preferred console (eg. offb
> driver as used on powermac systems).
>
> In these cases try to ensure that we provide some console output by
> enabling the first usable registered console, which we keep track of
> with the of_fallback_console variable. Affected systems will enable
> their console later than they did prior to commit 05fd007e4629
> ("console: don't prefer first registered if DT specifies stdout-path")
> but should otherwise produce the same output.
>
> Tested in QEMU with a PowerPC pseries_defconfig kernel.

Unfortunately, that still doesn't work on PowerMac.

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."