No L2 Cache on PReP Machine

[Hager, Johannes, HRD/AB]

Hi,

>Generally Linux expects the boot firmware to set up the L2 and L3 caches
>on PowerPC machines. Are you quite sure (from benchmark timings) that
>the L2 cache is not working? The MVME3604 has an L2 cache outside the
>processor, and it should work transparently.
First the /proc/cpuinfo file contains the following informations:
processor   : 0
cpu   : 604r
clock   : 400MHz
revision  : 49.2 (pvr 0009 3102)
bogomips: 399.76
machine : PReP MVME 3600 with MVME761
l2 cache: none
simms   :

I did the following test on this machine afte which I decided that the L2
cache is not used.
I have a test program on VxWorks which takes about 110 ms for execution on
the MVME3604 with enable L2 cache
I ported this application to a RTAI module and did the test on linux and it
took about 420ms
So i disabled the L2 cache in VxWorks and did the test again and then it
took with VxWorks about 417ms.
After this and because of the content from /proc/cpuinfo I decided that the
L2 cache is not used.

BTW I am using kernel 2.4.25

Best regards,
Johannes

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No L2 Cache on PReP Machine

[Hager, Johannes, HRD/AB]

Hi
I am usign Linux on the Motorola MVME3604 Board. This Board complies to the
PReP standard. So I configured the linux machine type to
"CHRP/PowerMac/PReP".
The kernel starts without showing any errors, but the problem is, that the
L2 cache of the board is not recognized by the kernel. Does the linux not
support L2 caches on PReP machines or is it another problem?

Best regards,
Johannes

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How To port Interrupt Driver

[Hager, Johannes, HRD/AB]

Hello All,
I am porting Linux to a custom board with a MPC604.
On this board we have a self made interrupt controller.
Can anybody tell me, which kernel modules I have to
change for getting our interrupt controller work?

Best regards
Johannes Hager

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