use ramdisk as root file system

Dave Aubin daubin at
Fri Sep 3 08:21:02 CEST 2004

Pass the following in to your kernel parameter list

console=tty0, console=ttyS0,115200 

Then connect a serial line to your serial port and to another machine
Look at the serial output with hyperterm or something.  I didn't want to
Do this at first, but it has made my life sooooo much easier.  If you
Do this, consider also that 2.6 kernel has netconsole.  Netconsole can
Send the same serial information over the network so you can see what is

-----Original Message-----
From: zhu shi song [mailto:zhushisongzhu at] 
Sent: Friday, September 03, 2004 9:25 AM
To: Dave Aubin; linuxbios at
Subject: RE: use ramdisk as root file system

I've made one initrd to try. But when executing at /sbin/init, linux
halts.  Output log is as following:
RAMDISK: Compressed image found at block 0 Freeing initrd memory: 3687k
VFS: Mounted root (ext2 filesystem) readonly.
Freeing unused kernel memory: 64k freed
Warning: unable to open an initial console.
By the way, using initramfs, can I have rw root fs on ramdisk?
--- Dave Aubin <daubin at> wrote:

> Here is a good way to do initramfs.  Initramfs becomes part of the 
> kernel and Then executes it's programs in user space which makes 
> things nice.  But there Are other advantages as well.  Feel free to 
> read these while on the
> thrown;)
> For my needs initramfs is a life saver, but initrd is good too.  Heck 
> you could Go NFS if you wish.
> Enjoy,
> Dave:)
> -----Original Message-----
> From: linuxbios-admin at 
> [mailto:linuxbios-admin at] On Behalf Of zhu shi song
> Sent: Friday, September 03, 2004 6:53 AM
> To: linuxbios at
> Subject: use ramdisk as root file system
> I now can boot my QDIA6T(vt8601/vt82c686b) MB using hard disk as root 
> file system though there is no vga turned on.  But I don't need HD. I 
> hope I can mount RAMDisk as my root filesystem which can be read and 
> written.  How should I do to start such work?  I have read some 
> material about initrd but I don't understand it very clearly.
> tks
> zhu
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