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 <[email protected]>
---
Documentation/powerpc/cpu_families.rst | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/Documentation/powerpc/cpu_families.rst b/Documentation/powerpc/cpu_families.rst
index 1e063c5440c3..9b84e045e713 100644
--- 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
--
2.25.0
On Thu, 2 Jul 2020 14:09:21 +0000 (UTC), Christophe Leroy wrote:
> 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.
>
> [...]
Applied to powerpc/next.
[1/1] docs: powerpc: Clarify book3s/32 MMU families
https://git.kernel.org/powerpc/c/7d38f089731fe129a49e254028caec6f05420f18
cheers