From mboxrd@z Thu Jan  1 00:00:00 1970
From: Grant Grundler <grundler@parisc-linux.org>
Subject: Re: console handover: boot [ttyB0] -> real [ttyS0]
Date: Mon, 14 Dec 2009 22:52:47 -0700
Message-ID: <20091215055247.GC31805@lackof.org>
References: <4B2362EB.2090409@logix.net.nz> <7d01f9f00912121247g376d54e9pb39d6023ddaaa878@mail.gmail.com> <4B26CC9A.6040208@logix.net.nz>
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Cc: Thibaut VARENE <T-Bone@parisc-linux.org>,
	linux-parisc@vger.kernel.org
To: Michal Ludvig <mludvig@logix.net.nz>
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In-Reply-To: <4B26CC9A.6040208@logix.net.nz>
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On Tue, Dec 15, 2009 at 12:39:06PM +1300, Michal Ludvig wrote:
...
> Is it configurable which one of ttyS0 - ttyS3 turns the ttyB0 boot
> console to?

ttyB0 is the "PDC Console" device name - linux kernel is using PDC
to push characters to the device defined in PDC (aka BIOS) to be console.
Interrupt the autoboot process and look at "in all".

ttyS0-ttyS3 are enumerations of Serial devices that the linux kernel
discovers when respective drivers are loaded. ttyB0 and ttyS<n> are
just different drivers accessing the same HW - preferably not at the
same time and that's why the kernel stops using ttyB0 later.

That make more sense?

grant