Uncompressed root fs to ramdisk.

[Mattias Sjogren]

Another thing to try... Mount the filesystem in synch-mode
and no curruption should occur on a suden power failure. Or,
does anyone know any better?

/Mattias

Ralph Stickley <r_stickley@yahoo.com> skrev:
> Kyle,
> Thanks for the help!  
> 
> --- Kyle Harris <kharris@nexus-tech.net> wrote:
> > Ralph,
> > 
> > Please see below.
> > 
> > Ralph Stickley wrote:
> > 
> > > Not sure about the minigetty thing.  I think the
> /dev/tty things (are they
> > > files , pipes ? does anybody know ?? ) have to be in
> R/W partition. I just
> > > linked to my ram disk:
> > 
> > /dev/xxx are special "files" called nodes. It provides
> a mechanism for
> > accessing devices through a major and minor number.
> > 
> Ahhh! thats the mknod thing does ... Still not sure how
> the permissions 
> get changed on these files even with a read-only file
> system...
> 
> Of course, init finds rc.sysinit before I execute a
> mount...
> 
> Hey, does the kernel mount the "root=/dev/hdx" device
> specified to Lilo?
> Then it can read inittab and use the /dev stuff.  Then
> rc.sysinit
> mounts this as read only.
> Only guessing here, then why doesn't my initial console
> work ?
> Does this mean my file system is mounted read/write at
> boot time ?
> 
> Hmmmm...I guess I'd have to study the kernel source code
> to find this...
> any clues ?
> 
> > > 
> > > mount /dev/ram /var
> > > /tmp -> /var
> > > /dev/tty0 -> /tmp/tty0
> > > ...
> > >
> > 
> > I like this idea of having /dev in the ramdisk. 
> 
> Only some items are linked...others seem to work even
> though they are in 
> read only file system...(like /dev/ram :)
> 
> > But how does this work
> > since you need /dev/ram in order to create and mount
> /var? And the
> > kernel wants a console early in the boot sequence.
> > 
> 
> Oops...caught me :-)  I get a nasty message from the
> kernel at boot time.
> Something about not being able to open initial console.
> Ok. Tough! Hmmmm...
> wonder if that screws up other stuff ??  I have no clue
> whats going on 
> here with these /dev/ node things...
> 
> > > Where /tmp is a link to the /var mount point for the
> ram disk. That might
> > help
> > > ?
> > > 
> > > Do you create more than one ramdisk ? How do you
> specify the size of your
> > ram
> > > disk ?
> > 
> > for a 2 MB disk, I use mke2fs -m0 /dev/ram0 2048
> > 
> Ah...another flag!  Should have figured..Thanks for the
> help :-)
> 
> Later,
> Ralph
> 
> > Kyle.
> > ---------------------------------------------------
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> > See the PWL homepage at  http://embedded.adis.on.ca
> > ---------------------------------------------------
> 
> 
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