[syslinux] PXELINUX: initrd loading failed

[Gene Cumm]

On Thu, Sep 30, 2010 at 07:16, Muhammad Ammar <mammar at gmail.com> wrote:
> I build a minimal FC13 using kickstart and livecd-creator.
>
> Then i created vmlinuz0 and initrd0.img using livecd-iso-to-pxeboot shell
> script.
>
> The  'root=' and 'rootfstype=' parameters were added
> by livecd-iso-to-pxeboot shell script.
>
> Now i have installed 1GB RAM, the following message has gone now
>
>  initrd too large to handle, disabling initrd
>  Kernel panic - not syncing: VFS: Unable to mount root fs
> on unknown-block(0,0)
>
> but it still not loading the OS and hanged(show the syslinux menu and upon
> menu entry selection nothing happens)

Are you using menu.c32/vesamenu.c32?  If so, exit from the menu system
to the "boot: " prompt and type "linux0" (the LABEL in question;
without quotes, of course) and watch its output.  This should help you
in seeing if there's a hidden error.

> Regards,
>
> On Thu, Sep 30, 2010 at 4:00 PM, Geert Stappers <stappers at stappers.nl>wrote:
>
>> Op 20100930 om 15:11 schreef Muhammad Ammar:
>> > On Thu, Sep 30, 2010 at 2:39 PM, Ferenc Wagner <wferi at niif.hu> wrote:
>> > > Muhammad Ammar <mammar at gmail.com> writes:
>> > >
>> > > > initrd too large to handle, disabling initrd
>> > > > Kernel panic - not syncing: VFS: Unable to mount root fs on
>> > > > unknown-block(0,0)
>> > > >
>> > > > Size of initrd0.img is approx. 317 MB
>> > > > Size of vmlinuz is approx. 4 MB
>> > > >
>> > > > Note: The problem is on just one system, all other systems boot
>> > > > without any problem.
>> > >
>> > > Maybe this system hasn't got enough memory for this initrd?
>> >
>> > I have a 512MB RAM in it. Is this not enough?
>> > How can i calculate amount of memory needed for network boot?
>>
>> I'm not sure there is an "out of memory error".
>>
>> What I see is :
>> > > > Kernel panic - not syncing: VFS: Unable to mount root fs on
>> > > > unknown-block(0,0)
>>
>> So we have 'Unable to mount root fs'  and "unknown-block"
>>
>> Please explain what the idea is behind
>>
>> | label linux0
>> | menu label MyFedora13 (default)
>> |   kernel vmlinuz0
>> | APPEND rootflags=loop initrd=initrd0.img root=live:/FC13.iso
>> | rootfstype=iso9660 rw liveimg quiet selinux=0 rhgb rd_NO_LUKS rd_NO_MD
>> | noiswmd blacklist nouveau
>>
>> especial the idea about 'root=' and 'rootfstype='
>>
>>
>> Cheers
>> Geert Stappers

-- 
-Gene