From: "D. Stimits" <stimits@idcomm.com>
To: kernel-list <linux-kernel@vger.kernel.org>
Subject: bzImage, root device Q
Date: Fri, 20 Jul 2001 01:41:31 -0600 [thread overview]
Message-ID: <3B57E0AB.F5D6B2E2@idcomm.com> (raw)
When booting to a bzImage kernel, bytes 508 and 509 can be used to name
the minor and major number of the intended root device (although it can
be overridden with a command line parameter). Other characteristics are
also available this way, through bytes in the kernel. rdev makes a
convenient way to hex edit those bytes.
What I'm more curious about is how does the kernel know what filesystem
_type_ the root is? Are there similar bytes in the bzImage, and can rdev
change this? And is there a command line syntax to allow specifying
filesystem type (e.g., something like "vmlinuz root=/dev/scd0,iso9660"
or "vmlinuz root=/dev/scd0,xfs")? Or is this limited in some way,
requiring mount on one or a few known filesystem types ("linux native"
subset comes to mind), followed by a chroot or pivot_root style command
(which in turn means no direct root mount of some filesystem types)?
D. Stimits, stimits@idcomm.com
next reply other threads:[~2001-07-20 7:41 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-07-20 7:41 D. Stimits [this message]
2001-07-20 10:46 ` bzImage, root device Q Jesse Pollard
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