Re: powerpc64: Enable CONFIG_E500 and CONFIG_PPC_E500MC for e5500/e6500

On Mon, 2016-09-26 at 10:48 +0200, David Engraf wrote:

Am 25.09.2016 um 08:20 schrieb Scott Wood:

quoted

On Mon, Aug 22, 2016 at 04:46:43PM +0200, David Engraf wrote:

quoted

The PowerPC e5500/e6500 architecture is based on the e500mc core. Enable
CONFIG_E500 and CONFIG_PPC_E500MC when e5500/e6500 is used.

This will also fix using CONFIG_PPC_QEMU_E500 on PPC64.

Signed-off-by: David Engraf <redacted>
---
 arch/powerpc/platforms/Kconfig.cputype | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/platforms/Kconfig.cputype

b/arch/powerpc/platforms/Kconfig.cputype
index f32edec..0382da7 100644

--- a/arch/powerpc/platforms/Kconfig.cputype
+++ b/arch/powerpc/platforms/Kconfig.cputype

@@ -125,11 +125,13 @@ config POWER8_CPU

 config E5500_CPU
 	bool "Freescale e5500"
-	depends on E500
+	select E500
+	select PPC_E500MC

 config E6500_CPU
 	bool "Freescale e6500"
-	depends on E500
+	select E500
+	select PPC_E500MC

These config symbols are for setting -mcpu.  Kernels built with
CONFIG_GENERIC_CPU should also work on e5500/e6500.

I don't think so.

I do think so.  It's what you get when you run "make corenet64_smp_defconfig"
and that kernel works on e5500/e6500.

 At least on QEMU it is not working because e5500/e6500 
is based on the e500mc core and the option CONFIG_PPC_E500MC also 
controls the cpu features (check cputable.h).

Again, this is only a problem when you have CONFIG_PPC_QEMU_E500 without
CONFIG_CORENET_GENERIC, and the fix for that is to have CONFIG_PPC_QEMU_E500
select CONFIG_E500 (and you need to manually turn on CONFIG_PPC_E500MC if
applicable, since CONFIG_PPC_QEMU_E500 can also be used with e500v2).

I wouldn't be opposed to also adding "select PPC_E500MC if PPC64" to
CONFIG_PPC_QEMU_E500.

quoted

The problem is that CONFIG_PPC_QEMU_E500 doesn't select E500 (I didn't
notice it before because usually CORENET_GENERIC is enabled as well).

I noticed that as well, but I think it makes more sense to select 
E500/PPC_E500MC within the cputype menu instead of having a dependency 
which might be not clear for the user.

Again, that breaks CONFIG_GENERIC_CPU.  Unlike 32-bit, all 64-bit book3e
targets are supposed to be supportable with a single kernel image.

-Scott