From: Khem Raj <raj.khem@gmail.com>
To: Patches and discussions about the oe-core layer
<openembedded-core@lists.openembedded.org>
Subject: Re: [PATCH 1/3] Add ARM tune file overhaul based largely on work from Mark Hatle
Date: Wed, 27 Jul 2011 17:43:26 -0700 [thread overview]
Message-ID: <20110728004326.GA16204@sakrah.homelinux.org> (raw)
In-Reply-To: <1311801404.3398.16.camel@lenovo.internal.reciva.com>
> >
> > It was my understanding that interwork was always enabled these days. Does
> > interworking require a thumb compatible arm core?
>
> Not for v5 and up, since the ARM-state BX instruction always exists
> (even if it isn't capable of switching to Thumb-state), and pop {pc}
> always changes state if necessary. The combination of these two things
> means that interworking basically comes for free and there is no benefit
> to turning it off.
>
> But for v4T, the only instruction which is capable of a state change is
> BX, and that instruction simply doesn't exist at all in the non-T v4
> architecture. So, if you plan to run on a v4 core you must either build
> with interworking off, or (more commonly nowadays) use the --fix-v4bx
> linker option to convert BX back to MOV during final link.
We use --fix-v4bx in oe
--
-Khem
next prev parent reply other threads:[~2011-07-28 0:46 UTC|newest]
Thread overview: 92+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1311683981.git.richard.purdie@linuxfoundation.org>
2011-07-26 12:44 ` [PATCH 1/3] Add ARM tune file overhaul based largely on work from Mark Hatle Richard Purdie
2011-07-26 12:46 ` Koen Kooi
2011-07-27 12:17 ` Phil Blundell
2011-07-27 13:33 ` Richard Purdie
2011-07-27 14:27 ` Mark Hatle
2011-07-27 14:33 ` Koen Kooi
2011-07-27 14:49 ` Mark Hatle
2011-07-27 14:57 ` Phil Blundell
2011-07-27 15:01 ` Koen Kooi
2011-07-27 15:08 ` Phil Blundell
2011-07-27 15:13 ` Koen Kooi
2011-07-27 15:17 ` Phil Blundell
2011-07-29 6:31 ` Khem Raj
2011-07-29 6:20 ` Khem Raj
2011-07-27 14:34 ` Richard Purdie
2011-07-27 14:44 ` Phil Blundell
2011-07-27 14:55 ` Mark Hatle
2011-07-29 6:18 ` Khem Raj
2011-07-29 7:15 ` Phil Blundell
2011-07-29 6:08 ` Khem Raj
2011-07-29 6:47 ` Phil Blundell
2011-07-29 6:51 ` Khem Raj
2011-07-27 14:34 ` Phil Blundell
2011-07-27 14:58 ` Mark Hatle
2011-07-27 15:25 ` Phil Blundell
2011-07-27 15:29 ` Richard Purdie
2011-07-27 15:49 ` Phil Blundell
2011-07-27 17:19 ` Mark Hatle
2011-07-27 19:31 ` Phil Blundell
2011-07-27 20:48 ` Mark Hatle
2011-07-27 21:16 ` Phil Blundell
2011-07-28 0:43 ` Khem Raj [this message]
2011-07-28 7:24 ` Martin Jansa
2011-07-28 8:54 ` Phil Blundell
2011-07-28 18:17 ` Martin Jansa
2011-07-29 6:41 ` Khem Raj
2011-07-29 6:38 ` Khem Raj
2011-07-29 7:13 ` Phil Blundell
2011-07-29 6:27 ` Khem Raj
2011-07-27 17:31 ` do_rootfs broken, was: " Koen Kooi
2011-07-27 18:19 ` Koen Kooi
2011-07-28 11:39 ` Phil Blundell
2011-07-29 5:59 ` Khem Raj
2011-07-29 7:25 ` Phil Blundell
2011-07-29 8:22 ` Koen Kooi
2011-07-26 12:44 ` [PATCH 2/3] Add basic Mips core tune config Richard Purdie
2011-07-26 14:41 ` Mark Hatle
2011-07-26 16:51 ` Richard Purdie
2011-07-26 17:08 ` Mark Hatle
2011-07-26 19:47 ` Khem Raj
2011-08-11 11:25 ` Phil Blundell
2011-08-11 12:08 ` Richard Purdie
2011-08-11 12:29 ` Phil Blundell
2011-08-11 14:28 ` Richard Purdie
2011-08-11 14:49 ` Khem Raj
2011-08-12 14:35 ` Phil Blundell
2011-08-12 15:28 ` Khem Raj
2011-08-11 15:54 ` Mark Hatle
2011-07-26 12:44 ` [PATCH 3/3] Add basic PowerPC " Richard Purdie
2011-07-26 13:47 ` Kumar Gala
2011-07-26 13:59 ` Richard Purdie
2011-07-26 14:59 ` Mark Hatle
2011-07-26 15:22 ` Kumar Gala
2011-07-26 16:18 ` Richard Purdie
2011-07-26 21:56 ` Kumar Gala
2011-07-26 22:02 ` Kumar Gala
2011-07-26 22:29 ` Khem Raj
2011-07-26 22:52 ` Richard Purdie
2011-07-27 3:23 ` Kumar Gala
2011-07-27 8:36 ` Richard Purdie
2011-07-27 8:44 ` Koen Kooi
2011-07-27 9:30 ` Richard Purdie
2011-07-28 5:25 ` Add basic PowerPC core tune config (bug?) Kumar Gala
2011-07-28 6:09 ` Saul Wold
2011-07-28 7:48 ` Cui, Dexuan
2011-07-28 8:47 ` Paul Eggleton
2011-07-28 8:57 ` Koen Kooi
2011-07-28 9:20 ` Phil Blundell
2011-07-28 10:00 ` Koen Kooi
2011-07-28 10:03 ` Phil Blundell
2011-07-27 9:35 ` [PATCH 3/3] Add basic PowerPC core tune config Phil Blundell
2011-07-26 22:03 ` Kumar Gala
2011-07-27 8:31 ` Richard Purdie
2011-07-26 20:03 ` Khem Raj
2011-07-26 14:57 ` Mark Hatle
2011-07-26 16:36 ` Richard Purdie
2011-07-26 16:53 ` Mark Hatle
2011-07-26 17:05 ` Richard Purdie
2011-07-26 17:15 ` Mark Hatle
2011-07-26 19:21 ` Richard Purdie
2011-07-26 20:28 ` Richard Purdie
2011-07-26 20:13 ` Khem Raj
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