From: Milton Miller <miltonm@bga•com>
To: Yuri Tikhonov <yur@emcraft•com>
Cc: wd@denx•de, dzu@denx•de, linuxppc-dev@ozlabs•org,
paulus@samba•org, hugh@veritas•com, akpm@linux-foundation•org,
prodyuth@gmail•com, yanok@emcraft•com
Subject: Re: [PATCH][v4] powerpc 44x: support for 256KB PAGE_SIZE
Date: Fri, 16 Jan 2009 09:00:33 -0600 [thread overview]
Message-ID: <f341f40f2bfa0818be32a86da62ada9b@bga.com> (raw)
In-Reply-To: <200901130149.43588.yur@emcraft.com>
On Jan 12, 2009, at 4:49 PM, Yuri Tikhonov wrote:
> This patch adds support for 256KB pages on ppc44x-based boards.
Another day, another comment. The motivation for reply was the second
comment below.
>
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index 84b8613..18f33ef 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -443,6 +443,19 @@ config PPC_64K_PAGES
> bool "64k page size" if 44x || PPC_STD_MMU_64
> select PPC_HAS_HASH_64K if PPC_STD_MMU_64
>
> +config PPC_256K_PAGES
> + bool "256k page size" if 44x
> + depends on !STDBINUTILS && !SHMEM
depends on !STDBINUTILS && (!SHMEM || BROKEN)
to identify that it is not fundamentally incompatable just not a chance
of working without other changes.
> + help
> + Make the page size 256k.
> +
> + As the ELF standard only requires alignment to support page
> + sizes up to 64k, you will need to compile all of your user
> + space applications with a non-standard binutils settings
> + (see the STDBINUTILS description for details).
> +
> + Say N unless you know what you are doing.
> +
> endchoice
>
> config FORCE_MAX_ZONEORDER
> diff --git a/arch/powerpc/platforms/44x/Kconfig
> b/arch/powerpc/platforms/44x/Kconfig
> index 3496bc0..d02e8c8 100644
> --- a/arch/powerpc/platforms/44x/Kconfig
> +++ b/arch/powerpc/platforms/44x/Kconfig
> @@ -214,6 +214,18 @@ config 440SPe
> bool
> select IBM_NEW_EMAC_EMAC4
>
> +config STDBINUTILS
> + bool "Using standard binutils settings"
> + depends on 44x
> + default y
I think this should be
config STDBINUTILS
bool "Using standard binutils settings" if 44x
default y
that way we imply that all powerpc users are using the standard
binutils instead of only those using a 44x platform. We still get the
intended effect of asking the user only on 44x.
I haven't looked at the resulting question or config order to see if it
makes sense to leave it here or put it closer to the page size.
> + help
> + Turning this option off allows you to select 256KB PAGE_SIZE on
> 44x.
> + Note, that kernel will be able to run only those applications,
> + which had been compiled using binutils later than 2.17.50.0.3 with
> + '-zmax-page-size' set to 256K (the default is 64K). Or, if using
> + the older binutils, you can patch them with a trivial patch, which
> + changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
> +
> config 460EX
> bool
> select PPC_FPU
> --
> 1.6.0.6
milton
next prev parent reply other threads:[~2009-01-16 14:54 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-12 22:49 [PATCH][v4] powerpc 44x: support for 256KB PAGE_SIZE Yuri Tikhonov
2009-01-16 15:00 ` Milton Miller [this message]
2009-01-16 15:18 ` Re[2]: " Yuri Tikhonov
2009-01-18 2:32 ` Milton Miller
2009-01-18 13:40 ` Josh Boyer
2009-01-29 11:40 ` Re[4]: " Yuri Tikhonov
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