diff -urN linux-2.6.16.org/arch/powerpc/Kconfig linux-2.6.16/arch/powerpc/Kconfig
--- linux-2.6.16.org/arch/powerpc/Kconfig	2006-03-20 06:53:29.000000000 +0100
+++ linux-2.6.16/arch/powerpc/Kconfig	2006-05-15 16:16:13.383906875 +0200
@@ -517,6 +517,19 @@
 	bool "High memory support"
 	depends on PPC32
 
+config ENABLE_FULL_1G
+	bool "Enable full 1G"
+	depends on EXPERIMENTAL && !HIGHMEM && !KERNEL_START_BOOL && !LOWMEM_SIZE_BOOL && PPC32 
+	---help---
+	  Makes possible to use full 1G of memory without high memory
+	  support enabled.
+
+	  WARNING: This will reduce the amount of virtual space available 
+	  to user processes then it may cause problems.
+
+	  WARNING: If you are using yaboot a additional patch is required
+	  to make possible to load kernel compiled with this option.
+
 source kernel/Kconfig.hz
 source kernel/Kconfig.preempt
 source "fs/Kconfig.binfmt"
@@ -860,6 +873,7 @@
 
 config LOWMEM_SIZE
 	hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
+	default "0x40000000" if ENABLE_FULL_1G
 	default "0x30000000"
 
 config KERNEL_START_BOOL
@@ -875,6 +889,7 @@
 
 config KERNEL_START
 	hex "Virtual address of kernel base" if KERNEL_START_BOOL
+	default "0x80000000" if ENABLE_FULL_1G
 	default "0xc0000000"
 
 config TASK_SIZE_BOOL