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From: Josh Boyer <jwboyer@gmail.com>
To: Kumar Gala <galak@kernel.crashing.org>
Cc: paulus@samba.org, linuxppc-dev@lists.ozlabs.org,
	Ian Munsie <imunsie@au1.ibm.com>,
	linux-kernel@vger.kernel.org
Subject: Re: Introduce support for little endian PowerPC
Date: Fri, 1 Oct 2010 07:30:54 -0400	[thread overview]
Message-ID: <AANLkTinSDMvBb7rnnfwYMkEVOgDUqRetZg86rh-UmSAg@mail.gmail.com> (raw)
In-Reply-To: <2C5357FA-F87F-457E-B5C1-0DCC5A842DE7@kernel.crashing.org>

On Fri, Oct 1, 2010 at 5:02 AM, Kumar Gala <galak@kernel.crashing.org> wrot=
e:
>
> On Oct 1, 2010, at 2:05 AM, Ian Munsie wrote:
>
>> Some PowerPC processors can be run in either big or little endian modes,=
 some
>> others can map selected pages of memory as little endian, which allows t=
he same
>> thing. Until now we have only supported the default big endian mode in L=
inux.
>> This patch set introduces little endian support for the 44x family of Po=
werPC
>> processors.
>
> From a community aspect is anyone actually going to use this? =A0Is this =
going to be the equivalent of voyager on x86? =A0I've got nothing against s=
ome of the endian clean ups this introduces. =A0However the changes to misc=
_32.S are a bit ugly from a readability point of view. =A0Just seems like t=
his is likely to bit-rot pretty quickly.

I'm with Kumar on this one.  Why would we want to support this?  I
can't say I would be very willing to help anyone run in LE mode, let
alone have it randomly selectable.

josh

  reply	other threads:[~2010-10-01 11:30 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-10-01  7:05 Introduce support for little endian PowerPC Ian Munsie
2010-10-01  7:05 ` [PATCH 01/18] powerpc: Add ability to build little endian kernels Ian Munsie
2010-10-01  9:18   ` Kumar Gala
2010-10-01 11:28     ` Josh Boyer
2010-10-01 12:09       ` Benjamin Herrenschmidt
2010-10-01 11:40   ` Josh Boyer
2010-10-01 12:22     ` Benjamin Herrenschmidt
2010-10-01  7:05 ` [PATCH 02/18] powerpc: Add CROSSBE_COMPILE to build big endian boot wrapper Ian Munsie
2010-10-01  7:13   ` Geert Uytterhoeven
2010-10-01  7:19     ` Ian Munsie
2010-10-01  7:05 ` [PATCH 03/18] powerpc: Support parsing a little endian kernel from zImage wrapper Ian Munsie
2010-10-01  7:05 ` [PATCH 04/18] powerpc: Allow taishan platform to boot a little endian kernel Ian Munsie
2010-10-01  7:05 ` [PATCH 05/18] powerpc: Wire up 44x little endian boot for remaining 44x targets Ian Munsie
2010-10-01 11:27   ` Josh Boyer
2010-10-06  1:28     ` Ian Munsie
2010-10-06  1:55       ` Josh Boyer
2010-10-06  2:10         ` Sean MacLennan
2010-10-01  7:05 ` [PATCH 06/18] powerpc 44x: Set E bit in TLBs and PTEs when CPU is in little endian mode Ian Munsie
2010-10-01  7:06 ` [PATCH 07/18] powerpc: Use generic bitops for little endian bitmap operations Ian Munsie
2010-10-01  7:06 ` [PATCH 08/18] powerpc: Include the appropriate endianness header Ian Munsie
2010-10-01  7:06 ` [PATCH 09/18] powerpc: Support device tree regardless of CPU endianness Ian Munsie
2010-10-03  3:15   ` Grant Likely
2010-10-03  6:22     ` Benjamin Herrenschmidt
2010-10-01  7:06 ` [PATCH 10/18] powerpc: Support endian agnostic MMIO Ian Munsie
2010-10-01  7:06 ` [PATCH 11/18] powerpc: Make assembly endian agnostic when accessing 64bit values Ian Munsie
2010-10-01  7:06 ` [PATCH 12/18] powerpc 44x: Handle TLB miss regardless of endianness Ian Munsie
2010-10-01  7:06 ` [PATCH 13/18] powerpc 44x: Make DCR endianness agnostic Ian Munsie
2010-10-01  7:06 ` [PATCH 14/18] powerpc, of_serial: Endianness issues setting up the serial ports Ian Munsie
2010-10-07 23:23   ` Grant Likely
2010-10-01  7:06 ` [PATCH 15/18] mtd: Fix endianness issues from device tree Ian Munsie
2010-10-01 19:29   ` Artem Bityutskiy
2010-10-01  7:06 ` [PATCH 16/18] powerpc: Fix endianness issues in alignment handler Ian Munsie
2010-10-01  7:06 ` [PATCH 17/18] net: Fix endianess issues in IBM newemac driver Ian Munsie
2010-10-01  7:06 ` [PATCH 18/18] powerpc: Fix jiffies variable on little endian Ian Munsie
2010-10-01  9:02 ` Introduce support for little endian PowerPC Kumar Gala
2010-10-01 11:30   ` Josh Boyer [this message]
2010-10-01 11:55     ` Gary Thomas
2010-10-01 12:15       ` Benjamin Herrenschmidt
2010-10-01 12:37         ` Gary Thomas
2010-10-01 12:14     ` Benjamin Herrenschmidt
2010-10-01 16:20       ` Michel Dänzer
2010-10-01 20:50         ` Benjamin Herrenschmidt
2010-10-04 10:30           ` Michel Dänzer
2010-10-04 22:50             ` Benjamin Herrenschmidt
2010-10-01 17:59       ` Kumar Gala
2010-10-01 20:51         ` Benjamin Herrenschmidt
2010-10-01 22:03           ` Olof Johansson
2010-10-01 22:28             ` Benjamin Herrenschmidt
2010-10-07 16:25             ` Hollis Blanchard
2010-10-01 11:36 ` Josh Boyer
2010-10-01 12:21   ` Benjamin Herrenschmidt
2010-10-06  1:04   ` Ian Munsie

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