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SubjectRe: [PATCH 03/14] x86, config: change defaults PHYSICAL_START and PHYSICAL_ALIGN
On Thu, May 07, 2009 at 03:26:51PM -0700, H. Peter Anvin wrote:
> From: H. Peter Anvin <hpa@zytor.com>
>
> Change the default for CONFIG_PHYSICAL_START to 16 MB; 4 MB if
> EMBEDDED. Change the default for CONFIG_PHYSICAL_ALIGN to match up
> with a large page alignment datum (4 MB for non-PAE, 2 MB for PAE.)
>
> The default of 16 MB is designed to avoid occupying ZONE_DMA, as well
> as avoiding a 15-16 MB memory hole, which some vendors inexplicably
> still have in their systems.
>
> [ Impact: minor performance improvement, leave ZONE_DMA free ]
>
> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
> ---
> arch/x86/Kconfig | 19 +++++++++++--------
> 1 files changed, 11 insertions(+), 8 deletions(-)
>
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 039c3f0..13b3a5a 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -1455,17 +1455,20 @@ config KEXEC_JUMP
>
> config PHYSICAL_START
> hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
> - default "0x1000000" if X86_NUMAQ
> - default "0x200000" if X86_64
> - default "0x100000"
> + default "0x400000" if EMBEDDED
> + default "0x1000000"
> ---help---
> This gives the physical address where the kernel is loaded.
>
> If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then
> bzImage will decompress itself to above physical address and
> - run from there. Otherwise, bzImage will run from the address where
> - it has been loaded by the boot loader and will ignore above physical
> - address.
> + run from there. Otherwise, bzImage will run from the either
> + the above physical address or where it has been loaded by
> + the boot loader, whichever is higher.
> +
> + For embedded machines with very small memory (less than
> + about 24 MB) this may need to be adjusted downward from the
> + default value of 0x1000000 (16 MB).

But in the above you say that default is "0x400000" if EMBEDDED
That is in contradiction with the help - no?
Sam


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