From: Grant Grundler <grundler@parisc-linux.org>
To: Michal Ludvig <mludvig@logix.net.nz>
Cc: Thibaut VARENE <T-Bone@parisc-linux.org>, linux-parisc@vger.kernel.org
Subject: Re: console handover: boot [ttyB0] -> real [ttyS0]
Date: Mon, 14 Dec 2009 22:52:47 -0700 [thread overview]
Message-ID: <20091215055247.GC31805@lackof.org> (raw)
In-Reply-To: <4B26CC9A.6040208@logix.net.nz>
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
next prev parent reply other threads:[~2009-12-15 5:52 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-12 9:31 console handover: boot [ttyB0] -> real [ttyS0] Michal Ludvig
2009-12-12 20:47 ` Thibaut VARENE
2009-12-14 23:39 ` Michal Ludvig
2009-12-14 23:52 ` Thibaut VARENE
2009-12-15 5:52 ` Grant Grundler [this message]
2009-12-15 8:13 ` Michal Ludvig
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