linux-kernel - Re: rfc: remove early_printk from a few arches? (blackfin, m68k, mips)

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Date:	Wed, 17 Dec 2014 22:30:16 +0000
From:	Måns Rullgård <mans@...sr.com>
To:	Kevin Cernekee <cernekee@...il.com>
Cc:	Joe Perches <joe@...ches.com>,
	linux-arch <linux-arch@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	linux-m68k <linux-m68k@...ts.linux-m68k.org>,
	Steven Miao <realmz6@...il.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	linux-mips <linux-mips@...ux-mips.org>
Subject: Re: rfc: remove early_printk from a few arches? (blackfin, m68k, mips)

Kevin Cernekee <cernekee@...il.com> writes:

> On Wed, Dec 17, 2014 at 12:58 PM, Joe Perches <joe@...ches.com> wrote:
>> It seems like early_printk can be configured into
>> a few architectures but also appear not to be used.
>>
>> $ git grep -w "early_printk"
> [snip]
>> arch/mips/kernel/Makefile:obj-$(CONFIG_EARLY_PRINTK)    += early_printk.o
>
> Nowadays I try to use OF_EARLYCON whenever possible, but when that has
> been unavailable, I have used arch/mips/kernel/early_printk.c to get
> console output before the serial driver is initialized.  It runs very
> early in the boot sequence and has very few dependencies, which makes
> it useful for board bringup.

EARLY_PRINTK on MIPS is enabled just after prom_init(), well before
OF_EARLYCON is usable.  I'd prefer if it stayed that way.

-- 
Måns Rullgård
mans@...sr.com
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