Messages in this thread |  | | From | "Ian Thompson" <> | Subject | RE: How can I jump to non-linux address space? | Date | Fri, 5 Oct 2001 17:38:53 -0700 |
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> 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
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