mtsr and mfsr?

[Hua Ji <hji@netscreen.com>]

Folks,

Need help, please. Thanks in advance.

I am working on a board with MPC 750 for an internal products development.

I currently can no problem set up the BATs and enable MMU for memory
management. 

However, when I set up the segment registers, I am confused and stuck here.

I was trying to clear and write some values into those 15 sr registers by
using **mtsr**.

But looks like it doesn't work. The testing I did looks like follows:

-------------
#define RESET 0 
li %r3, RESET;

sync
isync
mtsr sr0, %r3
isync
sync

mfsr %r3, sr0
bl uart_print
...
-------------

The console print-out shows that I didn't write into srs with the zero
value, except
sr1 and sr5. All the rest sr(s) value is still not back to zero.

Did I miss something?

Thanks,

Mike



 

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