linux-kernel - Re: Kernel parameters: root

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Message-ID: <Pine.LNX.4.61.0705041628400.18504@yvahk01.tjqt.qr>
Date:	Fri, 4 May 2007 16:30:18 +0200 (MEST)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	Salvatore De Paolis <depaolis.salvatore@...ero.it>
cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Kernel parameters: root


On May 4 2007 15:37, Salvatore De Paolis wrote:
>
>I hope this is the right place to ask this question, if not please redirect me
>to the right ML.
>
>I would like to know more about kernel parameters and in particular about the
>root parameter.
>I'm booting the kernel from usb pen and the root could change while the pen is
>plugged in different machines with different hardware.
>I was trying to find info about "how to make this unique". 

By using root=/dev/disk/by-id/scsi-SATA_iCreate_CF_Card000000001-part1
for example. Requires an initramfs with udev.

>Does the kernel see only /dev/* ? There's no way to pass /dev/disk/*?

The kernel has special logic to translate some (not ALL)
/dev/[hs]d[abcd..] into device numbers if it cannot find
a device node.


Jan
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