we've tried to lower the fsys from 150MHz to 75MHz and the system will hang when it tried to copied data from the flash to the RAM and execute it. we're using u-boot and it works just fine when fsys is set within 100MHz and 150MHz. however, it hanged when we set the fsys to 75MHz or lower.
we only modified the the MFD & RFD in SYNCR while switching the fsys. so, we wonder if there's something else we need to modify?
- Inky Lung