lkml.org 
[lkml]   [2001]   [Oct]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRE: How can I jump to non-linux address space?
Date
> 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

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:04    [W:0.080 / U:0.204 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site