RE: How can I jump to non-linux address space?

["Ian Thompson" <ithompso@stargateip.com>]

> Essentially, you have 2 choices:
>
> 1. Turn off the MMU.
> 2. insert a 1:1 physical to virtual mapping for the ROM and call the code.
>    (with interrupts disabled).
>
> Which one works depends on what the ROM code requires.
>
> There is an example of (1) in the current ARM kernel sources - the RiscPC
> port uses this method to reboot - we can't activate the hardware reset
line
> on these machines, so our only option is to use this method.

I tried both of these, and I must be doing something wrong.  For (1), I
grabbed the code you mentioned from the RiscPC port (setup_mm_for_reboot()
and some code from the soft reset routine).  After calling
setup_mm_for_reboot, if I call __ioremap(), the processor hangs.  If I shut
down the MMU, I get the same results.

Where would be a good place to find an example of how to implement your
second suggestion?

thanks.  sorry to keep bothering you.  i'll also try asking on the arm
newsgroup...
-ian