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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