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From: Paul Parsons <lost.distance@yahoo.com>
To: Kirill Smelkov <kirr@mns.spb.ru>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
	Kay Sievers <kay.sievers@vrfy.org>,
	linux-kernel@vger.kernel.org
Subject: Re: No /dev/root with devtmpfs?
Date: Fri, 10 Feb 2012 13:10:37 +0000 (GMT)	[thread overview]
Message-ID: <1328879437.80871.YahooMailClassic@web29006.mail.ird.yahoo.com> (raw)
In-Reply-To: <20120210090425.GA3997@tugrik.mns.mnsspb.ru>

--- On Fri, 10/2/12, Kirill Smelkov <kirr@mns.spb.ru> wrote:
> > Could you simply use /etc/fstab to identify the root
> partition?
> 
> Unfortunately no, because /etc/fstab can't know where the
> card will be
> inserted to boot this time - i.e. either in compactflash
> slot on
> motherboard, or through usb via cardreader. So root has to
> be determined
> at runtime.
> 
> Personally I'm ok with no /dev/root symlink as long as there
> is another
> way to detect root blkdev reliably. And I'm still confised
> what's the
> rationale about why this can't be done for modern
> filesysems.

Here's another suggestion: /proc/cmdline

The bootloader might pass the root partition to the kernel via the
"root=" kernel parameter; these can be read at /proc/cmdline.
For example, on an HP iPAQ hx4700: root=/dev/mtdblock2


  reply	other threads:[~2012-02-10 13:10 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-02-06 11:18 No /dev/root with devtmpfs? Kirill Smelkov
2012-02-06 12:10 ` Paul Parsons
2012-02-06 12:52   ` Kirill Smelkov
2012-02-06 19:45 ` Kay Sievers
2012-02-07  7:55   ` Kirill Smelkov
2012-02-07 10:05     ` Kay Sievers
2012-02-08  7:35       ` Kirill Smelkov
2012-02-08 16:44         ` Paul Parsons
2012-02-08 17:20           ` H. Peter Anvin
2012-02-08 17:25             ` Kay Sievers
2012-02-08 17:36               ` H. Peter Anvin
2012-02-10  9:04           ` Kirill Smelkov
2012-02-10 13:10             ` Paul Parsons [this message]
2012-02-13  8:25               ` Kirill Smelkov
2012-02-13 18:48                 ` H. Peter Anvin
2012-02-13 19:30                   ` Kay Sievers
2012-02-13 19:32                     ` H. Peter Anvin

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