All of lore.kernel.org
 help / color / mirror / Atom feed
From: vijay.kilari@gmail.com (Vijay Kilari)
To: linux-arm-kernel@lists.infradead.org
Subject: v3.10 - big endian core support
Date: Fri, 12 Jul 2013 17:26:59 +0530	[thread overview]
Message-ID: <CALicx6sr=OXYAdSS-RXPCjSp4f_yLQyw6jJsQ2KyhgQ9fRtXag@mail.gmail.com> (raw)
In-Reply-To: <20130712134726.0a909165@skate>

On Fri, Jul 12, 2013 at 5:17 PM, Thomas Petazzoni
<thomas.petazzoni@free-electrons.com> wrote:
> Dear Vijay Kilari,
>
> On Fri, 12 Jul 2013 17:09:12 +0530, Vijay Kilari wrote:
>
>> > Ben Dooks has a separate branch on top of this base branch for
>> > big-endian support, that adds atags compat code to convert the ATAGs
>> > data from LE to BE. See the baserock/311/be/atags branch in
>> > git://git.baserock.org/delta/linux. Or
>> > http://git.baserock.org/cgi-bin/cgit.cgi/delta/linux.git/log/?h=baserock/311/be/atags.
>>
>>  ARM VE TC2 board, enabling CONFIG_THUMB2_KERNEL failed to boot in BE mode
>> It hangs at very early stage of boot
>
> Yeah, the Thumb2 code is not supported by Ben Dooks patches, it's part
> of the TODO-list. I think Ben said he would probably not have much time
> to work on this. I might be able to spare some time on this, so just
> let me know if I should start working on this. If I remember correctly,
> it's mainly the fixup_pv_table code that needed some Thumb2/BE love.

In fact, I tried with below changes.. still it fails

diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
index 2de1114..7df64c7 100644
--- a/arch/arm/kernel/head.S
+++ b/arch/arm/kernel/head.S
@@ -592,8 +592,14 @@ __fixup_a_pv_table:
        b       2f
 1:     add     r7, r3
        ldrh    ip, [r7, #2]
+#ifdef CONFIG_CPU_ENDIAN_BE8
+       rev     ip, ip
+#endif
        and     ip, 0x8f00
        orr     ip, r6  @ mask in offset bits 31-24
+#ifdef CONFIG_CPU_ENDIAN_BE8
+       rev     ip, ip
+#endif
        strh    ip, [r7, #2]
 2:     cmp     r4, r5
        ldrcc   r7, [r4], #4    @ use branch for delay slot

>
> Will, is getting Thumb2 working a requirement to get the BE support
> merged, or can we for now make the BE option depends on !THUMB2_KERNEL ?
>
> Thanks!
>
> Thomas
> --
> Thomas Petazzoni, Free Electrons
> Kernel, drivers, real-time and embedded Linux
> development, consulting, training and support.
> http://free-electrons.com

  reply	other threads:[~2013-07-12 11:56 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CALicx6u89THSiRa4FzGZrcoG8q+o_BD8qVEC4CYXEjPUVK_fJw@mail.gmail.com>
2013-07-12 11:47 ` v3.10 - big endian core support Thomas Petazzoni
2013-07-12 11:56   ` Vijay Kilari [this message]
2013-07-12 12:00     ` Ben Dooks
2013-07-15  2:50       ` jgq516 at gmail.com
2013-07-15  6:15         ` Vijay Kilari
2013-07-12 11:58   ` Ben Dooks
2013-07-12 12:06     ` Thomas Petazzoni
2013-07-12 12:33       ` Ben Dooks
2013-07-14 21:53     ` Will Deacon
2013-07-15  8:03       ` Ben Dooks
2013-07-15  8:36         ` Thomas Petazzoni
2013-07-15  9:02           ` jgq516 at gmail.com
2013-07-15 10:26           ` Ben Dooks
2013-07-15 13:17             ` Thomas Petazzoni
2013-07-16  8:00             ` jgq516 at gmail.com
2013-07-16 10:38               ` Ben Dooks
2013-07-01 11:03 Ben Dooks
2013-07-01 14:33 ` Thomas Petazzoni
2013-07-01 15:20   ` Ben Dooks
2013-07-08  5:39 ` jgq516 at gmail.com
2013-07-08  8:49   ` Will Deacon
2013-07-08  9:51     ` jgq516 at gmail.com
2013-07-08 11:02       ` Will Deacon
2013-07-08 17:03         ` Will Deacon
2013-07-09  1:18           ` jgq516 at gmail.com
2013-07-09  3:34             ` jgq516 at gmail.com
2013-07-09  7:45               ` Will Deacon
2013-07-09  9:55                 ` jgq516 at gmail.com
2013-07-09 10:04                   ` jgq516 at gmail.com
2013-07-09 15:36           ` Thomas Petazzoni
2013-07-08  9:58   ` Ben Dooks
2013-07-08 10:03     ` jgq516 at gmail.com
2013-07-08 11:10       ` Ben Dooks
2013-07-09  9:53         ` jgq516 at gmail.com
2013-07-09  9:59           ` Ben Dooks

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to='CALicx6sr=OXYAdSS-RXPCjSp4f_yLQyw6jJsQ2KyhgQ9fRtXag@mail.gmail.com' \
    --to=vijay.kilari@gmail.com \
    --cc=linux-arm-kernel@lists.infradead.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.