L4Linux bootprompt question

Jayesh Salvi jayesh.salvi at veritas.com
Sat Feb 12 18:25:29 CET 2005

Thanks a lot. That helped a lot.

F Everyone's I,

More information on major and minor devices can be found at

I had a boot CD for l4linux on fiasco. It was loading a ramdisk which
was getting the binaries from CD. Since I was having no luck getting
l4linux compiled, I decided to copy these binaries to hard disk and
change the grub.conf to make it boot from hard disk. But after doing
some intuitive things I found that it won't load l4linux until CD is put
in. So I tried to learn how the bootloading takes place. In the process
I stumbled upon this root=1:0 problem mentioned up in the thread. My
ext3 root file system is installed on /dev/hda6, from the devices.txt
file mentioned above I got that 1:0 stands for RAMdisk and for /dev/hda6
I will have to put 3:6. It worked (with the help of RAMdisk provided on
l4linux download page).. However now I have come to know that there is
no passing around compilation of L4Linux and L4Env, because the ram disk
is designed for and it looks for /lib/ which I will
need to build myself.

Anyway. Thanks. 

jsalvi at veritas

-----Original Message-----
From: Adam Lackorzynski [mailto:adam at erwin.inf.tu-dresden.de] On Behalf
Of Adam Lackorzynski
Sent: Tuesday, February 08, 2005 5:47 PM
To: Jayesh Salvi
Cc: l4-hackers at os.inf.tu-dresden.de
Subject: Re: L4Linux bootprompt question


On Tue Feb 08, 2005 at 17:24:11 -0600, Jayesh Salvi wrote:
> I an confused about the bootprompt arguments mention in the
> l4linux.cd.k_us.cfg file that is given to the loader to load the
> 2.6 kernel.
> The line is :
> task "vmlinuz26" "mem=44M noreplacement root=1:0 load_ramdisk=1
ramdisk_size=4096 l4env_rd=initrd.gz panicblink=0 lang=us"
> What does root=1:0 mean?
> After referring to "The Linux Bootprompt - HowTo"
> http://ldp.rtin.bz/HOWTO/BootPrompt-HOWTO-3.html#ss3.1 I figured out
> that the argument is of the type root=/dev/*

1:0 is another way of writing /dev/ram0, which is the block device with
major 1 and minor 0.

Adam                 adam at os.inf.tu-dresden.de
  Lackorzynski         http://os.inf.tu-dresden.de/~adam/

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