From: Lucas Stach <dev@lynxeye.de>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH] arm: enable unaligned access on ARMv7
Date: Tue, 05 Jun 2012 21:06:20 +0200 [thread overview]
Message-ID: <1338923180.1377.2.camel@tellur> (raw)
In-Reply-To: <4FCE52FB.3020501@wwwdotorg.org>
Hi Stephen,
Am Dienstag, den 05.06.2012, 12:42 -0600 schrieb Stephen Warren:
> On 06/05/2012 11:47 AM, Lucas Stach wrote:
> > Recent toolchains default to using the hardware feature for unaligned access on
> > ARM v7, rather than doing the software fallback. According to ARM this is safe
> > as all v7 implementations have to support this feature.
> > (http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0471c/BABJFFAE.html)
> >
> > To avoid CPU hangs when doing unaligned memory access, we have to turn off
> > alignment checking in our CPU initialisation code.
> > (http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0491c/CIHCGCFD.html)
>
> Does this behavior change trickle down to Linux/... too, or would an OS
> completely re-initialize this state, and hence not be affected?
>
Linux in particular does reinitialize this state and I expect any
reasonable OS to do so.
-- Lucas
next prev parent reply other threads:[~2012-06-05 19:06 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-05 17:47 [U-Boot] [PATCH] arm: enable unaligned access on ARMv7 Lucas Stach
2012-06-05 18:42 ` Stephen Warren
2012-06-05 19:06 ` Lucas Stach [this message]
2012-06-22 9:15 ` Albert ARIBAUD
2012-06-22 9:36 ` Lucas Stach
2012-06-22 11:16 ` Albert ARIBAUD
2012-06-22 11:47 ` Lucas Stach
2012-06-22 22:11 ` Aneesh V
2012-06-22 22:13 ` Aneesh V
2012-06-23 9:01 ` Albert ARIBAUD
2012-06-23 17:43 ` V, Aneesh
2012-06-25 20:34 ` Albert ARIBAUD
2012-06-25 21:49 ` Aneesh V
2012-06-25 22:02 ` Wolfgang Denk
2012-06-23 19:50 ` Måns Rullgård
2012-06-24 6:30 ` Lucas Stach
[not found] ` <20120625221741.3a32790e@lilith>
2012-06-25 21:34 ` Lucas Stach
2012-06-26 20:56 ` Rob Herring
2012-06-27 10:14 ` Tetsuyuki Kobayashi
2012-07-02 9:42 ` [U-Boot] [PATCH] arm: armv7: add compile option -mno-unaligned-access if available Tetsuyuki Kobayashi
2012-07-02 9:53 ` Måns Rullgård
2012-07-02 15:16 ` Lucas Stach
2012-07-02 16:14 ` Måns Rullgård
2012-07-03 7:10 ` Tetsuyuki Kobayashi
2012-07-05 7:57 ` Albert ARIBAUD
2012-07-18 21:37 ` Albert ARIBAUD
2012-07-19 4:31 ` Mike Frysinger
2012-07-19 4:29 ` Mike Frysinger
2012-07-19 6:28 ` Albert ARIBAUD
2012-07-19 14:27 ` Mike Frysinger
2012-07-20 7:12 ` Albert ARIBAUD
2012-07-12 15:12 ` Gary Thomas
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