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SubjectRe: [PATCH] move the kernel to 16MB for NUMA-Q
On 06/11/2007 10:07 PM, Rene Herman wrote:

> But, it's just a default anyway. Would it be considered beneficial to
> more explicitly provide a few options through a config menu, something
> like the attached?

Ehm, so now where did that long help actually end up? :-|
If the notion is considered okay, this wants someone with a little more
Kconfig insight it seems.

> diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
> index 8770a5d..6737529 100644
> --- a/arch/i386/Kconfig
> +++ b/arch/i386/Kconfig
> @@ -813,9 +813,10 @@ config CRASH_DUMP
> PHYSICAL_START.
> For more details see Documentation/kdump/kdump.txt
>
> -config PHYSICAL_START
> - hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP)
> - default "0x100000"
> +choice
> + depends on EMBEDDED || CRASH_DUMP
> + prompt "Physical address where the kernel is loaded"
> + default PHYSICAL_START_1M
> help
> This gives the physical address where the kernel is loaded.
>
> @@ -854,6 +855,40 @@ config PHYSICAL_START
>
> Don't change this unless you know what you are doing.
>
> + config PHYSICAL_START_1M
> + bool "1M"
> + help
> + Choose this to load the kernel at the standard 1M address.
> +
> + config PHYSICAL_START_4M
> + bool "4M"
> + help
> + Loading the kernel at a 4M aligned physical address can
> + make for a slightly faster kernel.
> +
> + Choose this if you have 8M or more installed.
> +
> + config PHYSICAL_START_16M
> + bool "16M"
> + help
> + Loading the kernel at a 4M aligned physical address can
> + make for a slightly faster kernel.
> +
> + Additionally, loading it at 16M gets it out of the legacy
> + DMA zone which you might consider beneficial if you use
> + devices doing legacy DMA (such as a floppy drive, an ECP
> + parallel port or DMA capable ISA peripherals).
> +
> + Choose this if you have 20M or more installed and a need
> + for legacy DMA.
> +endchoice
> +
> +config PHYSICAL_START
> + hex
> + default "0x100000" if PHYSICAL_START_1M
> + default "0x400000" if PHYSICAL_START_4M
> + default "0x1000000" if PHYSICAL_START_16M
> +
> config RELOCATABLE
> bool "Build a relocatable kernel(EXPERIMENTAL)"
> depends on EXPERIMENTAL

Rene.
-
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