1 files changed, 28 insertions, 2 deletions

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 8955262caa34..35efba546e03 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -285,6 +285,7 @@ config X86_BIGSMP
         ---help---
           This option is needed for the systems that have more than 8 CPUs
 
+if X86_32
 config X86_EXTENDED_PLATFORM
         bool "Support for extended (non-PC) x86 platforms"
         default y
@@ -293,12 +294,37 @@ config X86_EXTENDED_PLATFORM
           standard PC platforms. (which covers the vast majority of
           systems out there.)
 
-          If you enable this option then you'll be able to select a number
-          of non-PC x86 platforms.
+          If you enable this option then you'll be able to select support
+          for the following (non-PC) 32 bit x86 platforms:
+                AMD Elan
+                NUMAQ (IBM/Sequent)
+                RDC R-321x SoC
+                SGI 320/540 (Visual Workstation)
+                Summit/EXA (IBM x440)
+                Unisys ES7000 IA32 series
+                Voyager (NCR)
 
           If you have one of these systems, or if you want to build a
           generic distribution kernel, say Y here - otherwise say N.
+endif
+
+if X86_64
+config X86_EXTENDED_PLATFORM
+        bool "Support for extended (non-PC) x86 platforms"
+        default y
+        ---help---
+          If you disable this option then the kernel will only support
+          standard PC platforms. (which covers the vast majority of
+          systems out there.)
+
+          If you enable this option then you'll be able to select support
+          for the following (non-PC) 64 bit x86 platforms:
+                ScaleMP vSMP
+                SGI Ultraviolet
 
+          If you have one of these systems, or if you want to build a
+          generic distribution kernel, say Y here - otherwise say N.
+endif
 # This is an alphabetically sorted list of 64 bit extended platforms
 # Please maintain the alphabetic order if and when there are additions