linux-kernel - Re: Wait for console to become available, v3.2

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Message-ID: <20090426234642.GC17240@shareable.org>
Date:	Mon, 27 Apr 2009 00:46:42 +0100
From:	Jamie Lokier <jamie@...reable.org>
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	David VomLehn <dvomlehn@...co.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ingo Molnar <mingo@...e.hu>,
	Arjan van de Ven <arjan@...radead.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux USB Mailing List <linux-usb@...r.kernel.org>,
	Linux Embedded Mailing List <linux-embedded@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: Wait for console to become available, v3.2

Kay Sievers wrote:
> On Mon, Apr 27, 2009 at 01:12, Jamie Lokier <jamie@...reable.org> wrote:
> > Kay Sievers wrote:
> >> > _If_ the system doesn't wait for all block devices present at boot to
> >> > be enumerated before the boot script, then when the script looks in
> >> > that directory for a specific UUID, it would be good to wait until
> >> > "has everything present at boot been enumerated?" says yes.
> >>
> >> That's what distros do with initramfs today.
> >
> > I don't see how that's possible.  Haven't we been discussing how the
> > USB driver does not have any support (yet) for saying when it's found
> > every device present at boot time, and that it can probably be added?
> 
> It's easy for the rootfs, or any other mandatory filesystem, unlike it
> is for the console stuff.
> 
> There is no timeout, distro's initramfs waits for the specified root
> device until it appears. It's simple, there is nothing else to do for
> it. It does not care what bus it is, or who is probing what for how
> long. It loads all drivers it finds hardware for, and then spins until
> the device shows up and continues.

Ok.  I'm specifically _not_ talking about mandatory filesystems.
Thanks :-)

-- Jamie
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