From: Chen Gang <gang.chen.5i5j@gmail•com>
To: Ralf Baechle <ralf@linux-mips•org>
Cc: linux-m32r-ja@ml•linux-m32r.org, linux-mips@linux-mips•org,
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deller@gmx•de
Subject: Re: [PATCH v3] arch: Kconfig: Let all architectures set endian explicitly
Date: Fri, 15 Aug 2014 06:14:38 +0800 [thread overview]
Message-ID: <53ED34CE.3040001@gmail.com> (raw)
In-Reply-To: <20140814180418.GA20777@linux-mips.org>
On 08/15/2014 02:04 AM, Ralf Baechle wrote:
> On Fri, Aug 15, 2014 at 12:54:53AM +0800, Chen Gang wrote:
>
>> Normal architectures:
>>
>> - Big endian: avr32, frv, m68k, openrisc, parisc, s390, sparc
>>
>> - Little endian: alpha, blackfin, cris, hexagon, ia64, metag, mn10300,
>> score, unicore32, x86
>>
>> - Choose in config time: arc, arm, arm64, c6x, m32r, mips, powerpc, sh
>
> Nak for MIPS. On MIPS Kconfig already always sets one of CPU_BIG_ENDIAN
> and CPU_LITTLE_ENDIAN depending on platforms and where both endianess are
> supported by a platform, user choice:
>
> config FOO
> bool "foo"
> select SYS_SUPPORTS_LITTLE_ENDIAN
>
> config FOO
> bool "foo"
> select SYS_SUPPORTS_BIG_ENDIAN
> select SYS_SUPPORTS_LITTLE_ENDIAN
> [...]
> choice
> prompt "Endianess selection"
> help
> Some MIPS machines can be configured for either little or big endian
> byte order. These modes require different kernels and a different
> Linux distribution. In general there is one preferred byteorder for a
> particular system but some systems are just as commonly used in the
> one or the other endianness.
>
> config CPU_BIG_ENDIAN
> bool "Big endian"
> depends on SYS_SUPPORTS_BIG_ENDIAN
>
> config CPU_LITTLE_ENDIAN
> bool "Little endian"
> depends on SYS_SUPPORTS_LITTLE_ENDIAN
> help
>
> endchoice
>
OK, thanks, I assumes when support both endian, the default choice is
CPU_BIG_ENDIAN, although no default value for choice (originally, I did
worry about it).
> So I think you can just drop the MIPS segment from your patch.
>
If what I assumes is correct, what you said sounds reasonable to me.
Thanks.
--
Chen Gang
Open share and attitude like air water and life which God blessed
next prev parent reply other threads:[~2014-08-14 22:15 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-14 16:54 [PATCH v3] arch: Kconfig: Let all architectures set endian explicitly Chen Gang
2014-08-14 18:04 ` Ralf Baechle
2014-08-14 22:14 ` Chen Gang [this message]
2014-08-15 9:01 ` Chen Gang
2014-08-24 8:38 ` Chen Gang
2014-08-25 12:26 ` Chen Gang
2014-08-14 18:21 ` Vineet Gupta
2014-08-14 18:27 ` Lennox Wu
2014-08-14 22:22 ` Chen Gang
2014-08-14 23:12 ` Vineet Gupta
2014-08-15 1:29 ` Chen Gang
2014-08-15 1:47 ` Max Filippov
2014-08-15 1:52 ` Max Filippov
2014-08-15 2:06 ` Chen Gang
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