Hi, Making slow progress getting MCAN sorted properly on my custom sama5d27 board and when clocking it from the "UPLL" clokc (an internal PLL used to generate a 480MHz clock for the USB interfaces, and a useful clock for higher speed CAN setups) I found that the CAN baud rate was out.
This is because there is a special function register (SFR) that has to be set to reflect the crystal frequency used. This is correctly set by the AT91 bootloader and/or Uboot (I can read it at the start of the bringup code OK) but somewhere it is being changed to the wrong value again and I can't find where - a grep for the relevant SFR register in all of the nuttx code doesn't reveal anything (it only exists in my code or the sam_sfr header file as far as I can see) I have done a quick fix by re-writing the correct value in my bringup code but that isn't the right way to sort this. Any suggestions of how to find where/why/how this is being changed? Thanks, Tim.
