docs: powerpc: Clarify book3s/32 MMU families

Documentation wrongly tells that book3s/32 CPU have hash MMU. 603 and e300 core only have software loaded TLB. 755, 7450 family and e600 core have both hash MMU and software loaded TLB. This can be selected by setting a bit in HID2 (755) or HID0 (others). At the time being this is not supported by the kernel. Make this explicit in the documentation. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/261923c075d1cb49d02493685e8585d4ea2a5197.1593698951.git.christophe.leroy@csgroup.eu
zandrey · Jul 15, 2020 · 7d38f08 · 7d38f08
1 parent 1f9bb31
commit 7d38f08
Showing 1 changed file with 6 additions and 4 deletions.
diff --git a/Documentation/powerpc/cpu_families.rst b/Documentation/powerpc/cpu_families.rst
@@ -9,7 +9,9 @@ and are supported by arch/powerpc.
 Book3S (aka sPAPR)
 ------------------
 
-- Hash MMU
+- Hash MMU (except 603 and e300)
+- Software loaded TLB (603 and e300)
+- Selectable Software loaded TLB in addition to hash MMU (755, 7450, e600)
 - Mix of 32 & 64 bit::
 
    +--------------+                 +----------------+
@@ -24,9 +26,9 @@ Book3S (aka sPAPR)
           |                                 |
           |                                 |
           v                                 v
-   +--------------+                 +----------------+      +-------+
-   |     604      |                 |    750 (G3)    | ---> | 750CX |
-   +--------------+                 +----------------+      +-------+
+   +--------------+    +-----+      +----------------+      +-------+
+   |     604      |    | 755 | <--- |    750 (G3)    | ---> | 750CX |
+   +--------------+    +-----+      +----------------+      +-------+
           |                                 |                   |
           |                                 |                   |
           v                                 v                   v