From: u.kleine-koenig@pengutronix.de (Uwe Kleine-König)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v6 0/3] Updated Cortex-M3 series
Date: Sat, 4 Aug 2012 15:57:19 +0200 [thread overview]
Message-ID: <20120804135719.GK2626@pengutronix.de> (raw)
In-Reply-To: <20120803151740.GZ2005@localhost.localdomain>
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-K?nig 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-K?nig |
Industrial Linux Solutions | http://www.pengutronix.de/ |
next prev parent reply other threads:[~2012-08-04 13:57 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-03 10:10 [PATCH v6 0/3] Updated Cortex-M3 series Uwe Kleine-König
2012-08-03 10:10 ` [PATCH v6 1/3] ARM: make cr_alignment read-only #ifndef CONFIG_CPU_CP15 Uwe Kleine-König
2012-08-03 10:10 ` [PATCH v6 2/3] Cortex-M3: Add base support for Cortex-M3 Uwe Kleine-König
2012-08-03 10:10 ` [PATCH v6 3/3] Cortex-M3: Add support for exception handling Uwe Kleine-König
2012-08-03 14:07 ` [PATCH v6 0/3] Updated Cortex-M3 series Arnd Bergmann
2012-08-03 14:50 ` Uwe Kleine-König
2012-08-03 15:17 ` Shiraz Hashim
2012-08-04 13:57 ` Uwe Kleine-König [this message]
2012-08-03 15:37 ` Jonathan Austin
2012-08-16 20:29 ` Uwe Kleine-König
2012-09-21 19:00 ` Uwe Kleine-König
2012-09-25 14:47 ` Jonathan Austin
2012-09-25 15:00 ` Uwe Kleine-König
2012-09-26 18:03 ` Will Deacon
2012-09-26 19:27 ` Uwe Kleine-König
2012-10-17 8:14 ` Uwe Kleine-König
2012-10-08 15:43 ` new branch for linux-next [Was: [PATCH v6 0/3] Updated Cortex-M3 series] Uwe Kleine-König
2012-10-08 15:47 ` Russell King - ARM Linux
2012-10-11 22:51 ` Stephen Rothwell
2012-10-15 23:08 ` Stephen Rothwell
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