Re: [PATCH RFC 2/2] ARM: nommu: remap exception base address to RAM
From: Afzal Mohammed
Date: Tue Dec 13 2016 - 13:44:36 EST
Hi,
On Tue, Dec 13, 2016 at 09:38:21AM +0000, Vladimir Murzin wrote:
> On 11/12/16 13:12, Afzal Mohammed wrote:
> > this probably would have to be made robust so as to not cause issue on
> > other v7-A's upon trying to do !MMU (this won't affect normal MMU boot),
> > or specifically where security extensions are not enabled. Also effect
> > of hypervisor extension also need to be considered. Please let know if
> > any better ways to handle this.
> You might need to check ID_PFR1 for that.
Had been searching ARM ARM for this kind of a thing, thanks.
> > +#ifdef CONFIG_REMAP_VECTORS_TO_RAM
> > + mov r3, #CONFIG_VECTORS_BASE @ read VECTORS_BASE
> ldr r3,=CONFIG_VECTORS_BASE
>
> would be more robust. I hit this in [1]
>
> [1] https://www.spinics.net/lists/arm-kernel/msg546825.html
Russell suggested doing it in paging_init(), then probably assembly
circus can be avoided.
Regards
afzal