At Tue, 24 Jul 2001 12:00:15 +0100 (BST),
Robert Swindells wrote:
> I had been tracking down why I was getting faults in the files I
> copied from hpcarm/sa11x0. It was being generated when a variable
> called saipic_base was written with the virtual address of the
> interrupt controller registers.
> 
> The hpcarm port gets away with this as the kernel text is mapped RW,
> but I also wondered if I was missing something in my reading of the
> arm32 version. I didn't spot that they were all pointers to the real
> variables.
> 
> I'll do something similar in sa11x0_irq.S.

hpcarm should map the kernel text read only.  But at the same time I
want saipic_base being accessible by pc relative addressing, because
this value is referenced very often.

Changing the kernel text protection to read-only in cpu_configure()
seems a good workaround for me, at least for hpcarm.

--
IWAMOTO Toshihiro