You can simply tell the kernel to mount the root read-only. Just create /tmp and /var ramdisks (tmpfs). It's also a good idea to extract the /etc on ramdisk too (form a "factory" archive located on the read-only partition). On most boards that I develop the root is cramfs (read-only) and contains only stuff that should not be chaged by the end-user/client.
Hi everyone,
>
> I have to create a bootable CD-ROM for our embedded Linux system.
> I followed the steps as documented in the following link
>
>formatting link
>
> However the boot procedure always fails when the kernel tries to mount its
> root system. The kernel reported the error code -30 which indicates
> that the reason for the failure is that the CD-ROM is read-only.
>
> How can I pass a writable root file system to the Linux kernel?
> Is there way to let Linux kernel to use a read-only file system?
>
> Any help and tips will be greatly appreciated
>
>
> James X. Li
>
>
>
>
Regards,