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Date: Sat, 11 Oct 2008 08:01:47 -0400
From: David Relson <relson@osagesoftware.com>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] Howto erase the "Insert root floppy and press
enter" item before the kernel panic?
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On Fri, 10 Oct 2008 23:06:09 -0400
Andrey Vul wrote:
> On Fri, Oct 10, 2008 at 10:33 PM, David Wei <davidwei@newbread.tj.cn>
> wrote:
> > Sorry, I forgot that file .
> > the .config is in the attachment this time.
> > Thank you .
> >
> > On Fri, 10 Oct 2008 10:05:36 -0400
> > "Andrey Vul" <andrey.vul@gmail.com> wrote:
> >
> >> 2008/10/10 David Wei <davidwei@newbread.tj.cn>:
> >> > Hi,
> >> > I am trying kexec with "kernel panic reboot" cause i have to
> >> > manage my server remotely. the "kernel panic
> >> > reboot" (http://gentoo-wiki.com/TIP_Kernel_Panic_Reboot) has
> >> > beening working so good so far for the regular kernel
> >> > panic.However,sometimes when i were missed some file system
> >> > items,the booking process would ask me: "VFS: Unable to mount
> >> > root fs via NFS,trying floppy Insert root floppy and Press
> >> > Enter." And the system hungup there waiting for my Enter. How
> >> > can I remove this item from the booting process and panic
> >> > directly so that it can reboot? Besides,I want to keep the NFS
> >> > service. Thank you in advance.
> >> I'm guessing that this is due to the floppy being compiled into the
> >> emergency kernel.
> >> In any case, can you post your .config for the emergency kernel?
> >>
>
> Nothing in the .config looks suspicious.
> It looks like it's inevitable that kernel patching will be needed, at
> least, using the preprocessor to "hide" the floppy code.
> Try this (it comments out floppy support which happens after NFS
> support): comment_floppy.patch
> --- init/do_mounts.c 2008-04-16 22:49:44.000000000 -0400
> +++ init/do_mounts2.c 2008-10-10 23:03:06.867876561 -0400
> @@ -308,7 +308,8 @@
> ROOT_DEV = Root_FD0;
> }
> #endif
> -#ifdef CONFIG_BLK_DEV_FD
> +/* #ifdef CONFIG_BLK_DEV_FD */
> +#if 0
> if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR) {
> /* rd_doload is 2 for a dual initrd/ramload setup */
> if (rd_doload==2) {
>
> cd to your /usr/src/linux-... and run patch -p0 < comment_floppy.patch
> It should fix the _specific_ issue. It might not fix the root cause,
> however.
>
> --
> Andrey Vul
Looking in do_mounts.c, the code that generates the message is:
#ifdef CONFIG_ROOT_NFS
if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR) {
if (mount_nfs_root())
return;
printk(KERN_ERR "VFS: Unable to mount root fs via NFS, trying floppy.\n");
ROOT_DEV = Root_FD0;
}
#endif
Looking at the .config file, I see "CONFIG_ROOT_NFS=y". Since the
message is being printed, we know that
if (MAJOR(ROOT_DEV) == UNNAMED_MAJOR)
is true which wmeans that the
if (MAJOR(ROOT_DEV) == FLOPPY_MAJOR)
is false, i.e. the change to "#if 0" looks to be incorrect.
Perhaps "CONFIG_ROOT_NFS=y" in .config is the root cause. I'd suggest
changing the .config.
HTH,
David