# \[PATCH\] The MPC83xx family doesn't support performance monitor instructions

- Subsystems: LINUX FOR POWERPC (32-BIT AND 64-BIT), THE REST
- Maintainers: Madhavan Srinivasan, Linus Torvalds
- List: linuxppc-dev
- 4 messages, 4 authors
- Page: https://ratatoskr.run/linuxppc-dev/2008/03/9436620/t

## \[PATCH\] The MPC83xx family doesn't support performance monitor instructions

- From: Gerald Van Baren \<hidden\>
- Date: 2008-03-06 00:38:54 
- Message: https://ratatoskr.run/linuxppc-dev/2008/03/9436620.md

```text
"Errata to MPC8349EA PowerQUICC[tm] II Pro Integrated Host Processor Family
Reference Manual, Rev. 1" (Freescale)

Signed-off-by: Gerald Van Baren <redacted>
---

Hi Kumar,

Please apply this fix to 2.6.25rc4 if possible.  Without this
patch, the PPC_83xx family configuration is broken (will not compile).

 arch/powerpc/platforms/Kconfig |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/arch/powerpc/platforms/Kconfig b/arch/powerpc/platforms/Kconfig
index 0afd225..a578b96 100644
--- a/arch/powerpc/platforms/Kconfig
+++ b/arch/powerpc/platforms/Kconfig
@@ -22,7 +22,6 @@ config PPC_83xx
 	select FSL_SOC
 	select MPC83xx
 	select IPIC
-	select FSL_EMB_PERFMON
 
 config PPC_86xx
 	bool "Freescale 86xx"
-- 
1.5.4.1
```

## Re: \[PATCH\] The MPC83xx family doesn't support performance monitor instructions

- From: Kumar Gala \<hidden\>
- Date: 2008-03-06 14:07:42 
- Message: https://ratatoskr.run/linuxppc-dev/2008/03/9436633.md

```text

On Mar 5, 2008, at 6:33 PM, Gerald Van Baren wrote:

> "Errata to MPC8349EA PowerQUICC[tm] II Pro Integrated Host Processor Family
> Reference Manual, Rev. 1" (Freescale)
>
> Signed-off-by: Gerald Van Baren <redacted>
> ---
>
> Hi Kumar,
>
> Please apply this fix to 2.6.25rc4 if possible.  Without this
> patch, the PPC_83xx family configuration is broken (will not compile).

What's the compile issue?  Some of the 83xx family have perf mon so we need to fix the compile issue.

- k
```

## Realtime ethernet

- From: Mehlan, Markus (Ritter Elektronik) \<hidden\>
- Date: 2008-03-06 14:48:34 
- Message: https://ratatoskr.run/linuxppc-dev/2008/03/9436635.md

```text
Hello,

who knows a solution for realtime ethernet with
 an actual kernel (> 2.6.23)?

Best regards,
Markus=20
```

## Re: \[PATCH\] The MPC83xx family doesn't support performance monitor instructions

- From: Jerry Van Baren \<hidden\>
- Date: 2008-03-07 00:50:37 
- Message: https://ratatoskr.run/linuxppc-dev/2008/03/9436648.md

```text
Kumar Gala wrote:
> On Mar 5, 2008, at 6:33 PM, Gerald Van Baren wrote:
>
>> "Errata to MPC8349EA PowerQUICC[tm] II Pro Integrated Host Processor  Family
>> Reference Manual, Rev. 1" (Freescale)
>>
>> Signed-off-by: Gerald Van Baren <redacted>
>> ---
>>
>> Hi Kumar,
>>
>> Please apply this fix to 2.6.25rc4 if possible.  Without this
>> patch, the PPC_83xx family configuration is broken (will not compile).
>
> What's the compile issue?  Some of the 83xx family have perf mon so we  need to fix the compile issue.
>
> - k

Hi Kumar,

The mpc8360 and mpc8349 do not have a perfmon register (I don't find it at all in the MPC8360RM and the mpc8349 errata I referenced says the MPC8349RM is in error).

The result is that the assembler dies with an error.  If the assembler didn't die with an error, I presume the kernel would since it is an invalid SPR.

  CC      arch/powerpc/kernel/pmc.o
{standard input}: Assembler messages:
{standard input}:7: Error: Unrecognized opcode: `mfpmr'
{standard input}:11: Error: Unrecognized opcode: `mtpmr'
make[1]: *** [arch/powerpc/kernel/pmc.o] Error 1
make: *** [arch/powerpc/kernel] Error 2

This is using ELDK4.1 (also 4.2rc) using the ppc_6xx- version of the compiler (which symlinks to powerpc-linux-gcc).

If some of the mpc83xx processors have perfmon registers, we need a more granular way of selecting the CONFIG_FSL_EMB_PERFMON option (or a Plan B, but I don't know what Plan B would be).

Best regards,
gvb
```