From: Segher Boessenkool <segher@kernel.crashing.org>
To: Kumar Gala <galak@kernel.crashing.org>
Cc: linuxppc-dev@ozlabs.org, paulus@samba.org, arnd@arndb.de
Subject: Re: [patch 2/9] autoselect optimal -mcpu= flag by platform
Date: Sun, 17 Jun 2007 18:11:50 +0200 [thread overview]
Message-ID: <4919e259332813addb0c287848fa48c3@kernel.crashing.org> (raw)
In-Reply-To: <91EBCC0C-48B7-4748-A936-E74CEB7685E0@kernel.crashing.org>
> Is there a reason we don't distinguish between 7400/7410 and 74{4,5}
> x? Is it because we dont have any discrete systems with just a 7400
> on it?
It's quite important for 74[01]0 systems to not run
code tuned for 7450. Older Macs have such CPUs, the
user should have the option to tune for it.
> Also I'd suggest we have the config options be a 1:1 matching for the
> -mcpu/-mtune options in gcc for the following cases:
>
>> + default "-mcpu=750" if CPU_7xx
>> + default "-mcpu=7450" if CPU_74xx
>> + default "-mcpu=860" if PPC_8xx
>> + default "-mcpu=8540" if PPC_85xx
It would be good to do that for all cases, unfortunately
GCC doesn't recognise all CPU/core names as -mcpu options.
Segher
next prev parent reply other threads:[~2007-06-17 16:12 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20070616000511.712667424@arndb.de>
2007-06-16 0:05 ` [patch 1/9] move 82xx/83xx/86xx Kconfig options to platform selection arnd
2007-06-17 14:42 ` Kumar Gala
2007-07-11 15:35 ` Mark A. Greer
2007-07-11 20:33 ` Arnd Bergmann
2007-07-11 21:19 ` Segher Boessenkool
2007-07-11 23:47 ` Mark A. Greer
2007-06-16 0:05 ` [patch 2/9] autoselect optimal -mcpu= flag by platform arnd
2007-06-17 14:29 ` Kumar Gala
2007-06-17 16:11 ` Segher Boessenkool [this message]
2007-06-17 17:20 ` Arnd Bergmann
2007-06-17 17:46 ` Segher Boessenkool
2007-06-29 5:58 ` Paul Mackerras
2007-06-16 0:05 ` [patch 3/9] rename add_bridge to avoid namespace clashes arnd
2007-06-16 0:05 ` [patch 4/9] mpc82xx_ads build fix arnd
2007-06-16 7:37 ` Stephen Rothwell
2007-06-16 9:33 ` [updated PATCH] " Arnd Bergmann
2007-06-16 0:05 ` [patch 5/9] kill isa_{io,mem}_base definitions for !PCI arnd
2007-06-17 14:33 ` Kumar Gala
2007-06-17 15:32 ` Arnd Bergmann
2007-06-16 0:05 ` [patch 6/9] fix building without PCI arnd
2007-06-16 0:05 ` [patch 7/9] disallow building powermac and tsi108 " arnd
2007-06-17 14:35 ` Kumar Gala
2007-06-17 15:32 ` Arnd Bergmann
2007-06-16 0:05 ` [patch 8/9] fix conflicting mpc85xx board headers arnd
2007-06-16 0:05 ` [patch 9/9] enable multiplatform support for embedded boards arnd
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