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
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