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860T board crashes upon enable of MMU (CYG_MSR)


Hello,
I am trying to bring up a 860T based board using
viper as a template.   My code seems to be crashing
when trying to enable the MMU. (see assembly
dump below)  I have seen some
talk about this in the archives, but I am still
unclear what was happening there and if I am
seeing the same thing.
Help please!
Thanks, 
 Mike


fe0021e4:       48 00 84 e1     bl      fe00a6c4
<hal_platform_init>
fe0021e8:       48 00 7e 85     bl      fe00a06c
<hal_MMU_init>
fe0021ec:       3c 60 00 00     lis     r3,0
fe0021f0:       60 63 30 32     ori     r3,r3,CYG_MSR
fe0021f4:       7c 00 04 ac     sync
fe0021f8:       7c 60 01 24     mtmsr   r3
                                

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