linux-kernel - Re: [Patch] Wait for console to become available, ver 3

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Message-ID: <20090425081657.GB2428@ucw.cz>
Date:	Sat, 25 Apr 2009 10:16:59 +0200
From:	Pavel Machek <pavel@....cz>
To:	David VomLehn <dvomlehn@...co.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Embedded Mailing List <linux-embedded@...r.kernel.org>,
	Linux USB Mailing List <linux-usb@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [Patch] Wait for console to become available, ver 3

Hi!

> Parallelization to improve boot times has been successful enough that race
> conditions now exist between the init_post() open of /dev/console and
> initialization of the console device. When this occurs, opening /dev/console
> fails and any applications inherited from init have no standard in/out/error
> devices. This is expected behavior if no console device is available, but
> quite unfortunate in the case where the console is just a bit slow waking up.
> 
> Some buses, such as USB, offer no guarantees about how long it takes to
> discover devices, so there is no reliable way to distinguish between a missing
> console and a slow one.  The pragmatic approach taken in this patch is to
> wait for a while to see if a console shows up, and just go on if it doesn't.
> The default delay is 1000 msec (1 second).
> 
> There are two new command line parameters:
> consolewait		Wait forever for a console to be registered
> consoledelay=msec	Use the given number of milliseconds as the delay
> 			interval instead of the default

Could you use rootfsdelay for this? Root needs to be mounted for init
to run, so...?
								Pavel

-- 
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