[PATCH v6 0/3] Updated Cortex-M3 series

[Uwe Kleine-König]

Hello,

On Fri, Aug 03, 2012 at 08:47:40PM +0530, Shiraz Hashim wrote:
> On Fri, Aug 03, 2012 at 10:50:35PM +0800, Uwe Kleine-König wrote:
> > On Fri, Aug 03, 2012 at 02:07:08PM +0000, Arnd Bergmann wrote:
> > > Is it possible to build a NOMMU kernel that runs on both
> > > ARMv7-A amd ARMv7-M, in other words is ARMv7-M compatible with
> > > ARMv7-A (or ARMv7-R for that matter) if you don't use the MMU?
> >
> > the instructions to enable and disable irqs are different, so
> > we'd need another indirection at least there. Also the whole
> > exception model is different. So I'd say it's too different to
> > target for a common kernel for the A, R and M profiles.
> 
> We are using standard Linux kernel (v3.3) with MMU disabled on
> a Cortex R4 system.
Yeah, I expected A and R to be similar enough. It's the difference
between (A+R) and M that makes a common kernel for all three profiles
hard.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |