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authorNicholas Piggin <npiggin@gmail.com>2022-09-21 04:41:03 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2022-09-28 12:22:10 +0300
commit7fd123e544886bf04fa853869efe55cb3f22d0c0 (patch)
tree555194e7b8ac19dfd6350a996cfda0f2a9443493 /Documentation/powerpc
parent58ec7f06b74e0d6e76c4110afce367c8b5f0837d (diff)
downloadlinux-7fd123e544886bf04fa853869efe55cb3f22d0c0.tar.xz
powerpc/64s: update cpu selection options
Update the 64s GENERIC_CPU option. POWER4 support has been dropped, so make that clear in the option name. The POWER5_CPU option is dropped because it's uncommon, and GENERIC_CPU covers it. -mtune= before power8 is dropped because the minimum gcc version supports power8, and tuning is made consistent between big and little endian. A 970 option is added for PowerPC 970 / G5 because they still have a user base, and -mtune=power8 does not generate good code for the 970. This also updates the ISA versions document to add Power4/Power4+ because I didn't realise Power4+ used 2.01. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Reviewed-by: Segher Boessenkool <segher@kernel.crashing.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20220921014103.587954-2-npiggin@gmail.com
Diffstat (limited to 'Documentation/powerpc')
-rw-r--r--Documentation/powerpc/isa-versions.rst14
1 files changed, 14 insertions, 0 deletions
diff --git a/Documentation/powerpc/isa-versions.rst b/Documentation/powerpc/isa-versions.rst
index 5592b8899a48..a8d6b6028b3e 100644
--- a/Documentation/powerpc/isa-versions.rst
+++ b/Documentation/powerpc/isa-versions.rst
@@ -4,6 +4,8 @@ CPU to ISA Version Mapping
Mapping of some CPU versions to relevant ISA versions.
+Note Power4 and Power4+ are not supported.
+
========= ====================================================================
CPU Architecture version
========= ====================================================================
@@ -26,6 +28,12 @@ PPC970 - PowerPC User Instruction Set Architecture Book I v2.01
- PowerPC Virtual Environment Architecture Book II v2.01
- PowerPC Operating Environment Architecture Book III v2.01
- Plus Altivec/VMX ~= 2.03
+Power4+ - PowerPC User Instruction Set Architecture Book I v2.01
+ - PowerPC Virtual Environment Architecture Book II v2.01
+ - PowerPC Operating Environment Architecture Book III v2.01
+Power4 - PowerPC User Instruction Set Architecture Book I v2.00
+ - PowerPC Virtual Environment Architecture Book II v2.00
+ - PowerPC Operating Environment Architecture Book III v2.00
========= ====================================================================
@@ -48,6 +56,8 @@ Power5++ No
Power5+ No
Power5 No
PPC970 Yes
+Power4+ No
+Power4 No
========== ==================
========== ====
@@ -66,6 +76,8 @@ Power5++ No
Power5+ No
Power5 No
PPC970 No
+Power4+ No
+Power4 No
========== ====
========== ====================================
@@ -84,4 +96,6 @@ Power5++ No
Power5+ No
Power5 No
PPC970 No
+Power4+ No
+Power4 No
========== ====================================