[PATCH] AMD Elan is a different subarch

From: Adrian Bunk <bunk@fs.tum.de>

- AMD Elan is a different subarch, you can't configure a kernel that runs
  on both the AMD Elan and other i386 CPUs

- added optimizing CFLAGS for the AMD Elan

arch/i386/Kconfig

@@ -43,6 +43,15 @@ config X86_PC
 	help
 	  Choose this option if your computer is a standard PC or compatible.
 
+config X86_ELAN
+	bool "AMD Elan"
+	help
+	  Select this for an AMD Elan processor.
+
+	  Do not use this option for K6/Athlon/Opteron processors!
+
+	  If unsure, choose "PC-compatible" instead.
+
 config X86_VOYAGER
 	bool "Voyager (NCR)"
 	help
@@ -130,6 +139,8 @@ config ES7000_CLUSTERED_APIC
 	default y
 	depends on SMP && X86_ES7000 && MPENTIUMIII
 
+if !X86_ELAN
+
 choice
 	prompt "Processor family"
 	default M686
@@ -318,6 +329,8 @@ config X86_GENERIC
 	  when it has moderate overhead. This is intended for generic 
 	  distributions kernels.
 
+endif
+
 #
 # Define implied options from the CPU selection here
 #
@@ -334,7 +347,7 @@ config X86_XADD
 config X86_L1_CACHE_SHIFT
 	int
 	default "7" if MPENTIUM4 || X86_GENERIC
-	default "4" if MELAN || M486 || M386
+	default "4" if X86_ELAN || M486 || M386
 	default "5" if MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCRUSOE || MCYRIXIII || MK6 || MPENTIUMIII || MPENTIUMII || M686 || M586MMX || M586TSC || M586 || MVIAC3_2
 	default "6" if MK7 || MK8 || MPENTIUMM
 
@@ -380,7 +393,7 @@ config X86_POPAD_OK
 
 config X86_ALIGNMENT_16
 	bool
-	depends on MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCYRIXIII || MELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2
+	depends on MWINCHIP3D || MWINCHIP2 || MWINCHIPC6 || MCYRIXIII || X86_ELAN || MK6 || M586MMX || M586TSC || M586 || M486 || MVIAC3_2
 	default y
 
 config X86_GOOD_APIC

arch/i386/Makefile

@@ -48,6 +48,9 @@ cflags-$(CONFIG_MWINCHIP3D)	+= $(call check_gcc,-march=winchip2,-march=i586)
 cflags-$(CONFIG_MCYRIXIII)	+= $(call check_gcc,-march=c3,-march=i486) $(align)-functions=0 $(align)-jumps=0 $(align)-loops=0
 cflags-$(CONFIG_MVIAC3_2)	+= $(call check_gcc,-march=c3-2,-march=i686)
 
+# AMD Elan support
+cflags-$(CONFIG_X86_ELAN)	+= -march=i486
+
 CFLAGS += $(cflags-y)
 
 # Default subarch .c files

arch/i386/boot/setup.S

@@ -776,7 +776,7 @@ end_move_self:					# now we are at the right place
 # AMD Elan bug fix by Robert Schwebel.
 #
 
-#if defined(CONFIG_MELAN)
+#if defined(CONFIG_X86_ELAN)
 	movb $0x02, %al			# alternate A20 gate
 	outb %al, $0x92			# this works on SC410/SC520
 a20_elan_wait:

arch/i386/kernel/cpu/cpufreq/Kconfig

@@ -54,7 +54,7 @@ config X86_ACPI_CPUFREQ_PROC_INTF
 
 config ELAN_CPUFREQ
 	tristate "AMD Elan"
-	depends on CPU_FREQ_TABLE && MELAN
+	depends on CPU_FREQ_TABLE && X86_ELAN
 	---help---
 	  This adds the CPUFreq driver for AMD Elan SC400 and SC410
 	  processors.

include/asm-i386/timex.h

@@ -12,7 +12,7 @@
 #ifdef CONFIG_X86_PC9800
    extern int CLOCK_TICK_RATE;
 #else
-#ifdef CONFIG_MELAN
+#ifdef CONFIG_X86_ELAN
 #  define CLOCK_TICK_RATE 1189200 /* AMD Elan has different frequency! */
 #else
 #  define CLOCK_TICK_RATE 1193182 /* Underlying HZ */