[uCsimm] Rebooting from a NFS kernel image on uCsimm

From: Antonio BORNEO (antonio.borneo@st.com)
Date: Wed Oct 17 2001 - 10:11:11 EDT

Hi all,
we have just implemented a dirty trick in the uClinux kernel in order
to provide the capability to load in RAM a new kernel image from NFS,
and then rebooting it.

Probably this is not the best way to do that, but it works, and solves the

The attached file contains a kernel patch and a user program.

The patch modifies the reboot system-call allowing a user program
running a piece of itself in super-user mode.
This is required since iopl() is currently not implemented.

The user program loads the new image from a disk, kills all the other
processes and, through reboot(), it runs one procedure in super-user mode.
This procedure stops the running kernel, puts the new one in the right RAM
addresses, and jumps to it.

We have tested it only on uCsimm.

Saverio, Antonio

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