On Thu, 2005-12-15 at 05:53 -0800, Steven Ringwald wrote: > Bob Chiodini wrote: > > >Do you have a CF interface in your development/desktop? If so, then why > >not just copy your small installation directly to an ext2 or ext3 > >partition on the CF and grub-install grub as the boot loader? > > > >If you don't have a CF interface on your desktop, then either get one, > >or if your target can boot a CD... Boot up Knoppix, format the CF, copy > >your small installation to the CF over the network (SCP, NFS) then grub- > >install grub to the CF. > > > >You will most likely want to mount your root file system read-only and > >place all of your volatile data in a tmpfs file system to avoid > >shortening the life of the CF. > > > >You can also put your entire file system in a ramdisk (initrd) and run > >the system out of RAM. You will probably need a lot of RAM, but you > >don't have to worry about FSCK'ing the CF and it's probably faster > >without the CF I/O. > > > >CF to IDE adapters: > > > >http://mach5products.com/merchant2/merchant.mvc?Screen=CTGY&Category_Code=CF > > > >We use one similar to the $19.95 version near the bottom of the page. > > > > Bob, > > Thanks for your response! Yes, I have a CF <-> IDE adapter in my box. > The problem that I am having with ext2/ext3/etc is that no matter what I > specify, the system comes up (rw) (based on what /proc/mounts and touch > /foo show). I have the 'ro' flag on my kernel line in the grub.conf, and > have the noatime,ro line in my fstab, but they still seem to want to > come up rw... I have even gone so far as to wipe out /etc/mtab and > /etc/blkid.tab*, but haven't had much luck getting it to stay read-only > past the initrd stage.... I have gotten it to stay read-only by creating > a read-only filesystem image (like iso9660 or cramfs), but haven't had > much luck getting it to boot from another partition. (I basically have > to dd the iso image to /dev/hda3 and mount that in the initrc's init > script). > > Steve > Steve, A couple of questions: Is your mount command coming from busybox? Can you mount -o remount,ro the file system? noatime,ro in fstab is how it was done on one of the embedded systems I was working on, but it was not CF based. ? s aph what is Presuming busybox: Are you mounting the file system with the --ro option in your linuxrc file? This is the linuxrc file I used, but I cannot verify that it worked correctly, WRT mounting the root file system ro, I thought so: #!/bin/nash echo Mounting /proc filesystem mount -t proc /proc /proc echo Creating root device mkrootdev /dev/root echo 0x0100 > /proc/sys/kernel/real-root-dev echo Mounting root filesystem mount --ro -t ext3 /dev/root /sysroot umount /proc pivot_root /sysroot /sysroot/initrd This was a 2.4 kernel, based system. It started out from RH7. Nash was probably the only piece that was kept. Bob...
