[U-Boot] MPC850: strange problem with icache

Guowen SHAN shan.gavin at gmail.com
Sun Mar 29 15:28:15 CEST 2009

Hi Folks,

I'm porting u-boot-1.3.1 to customer board, which includes MPC850 and 32MB
When I turned off icache, bus can work correctly under 25MHz/50MHz clock
Note that CPU is working under 50MHz. However, the board only can work with
frequence of 25MHz with enabled icache. If I tried to set bus frequence to
50MHz with
enabled icache, it will crash with MCE.

I don't know why. Since it can work at 25MHz with enabled icache, the UPM
words seem
ok. Thanks for your advices!


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