Greetings<br><br>Currently I have a MPC885 based board running at 50MHz. I want USB host working at full speed with internal clock. Assuming I need to change the General System Clock Frequency (GCLK2) to 48MHz, I got this calculation with input frequency of 10MHz from an u-boot script.
<br><br>pdf mfi mfn mfd s dbrmo dpref dpgdck jdbck gclk2 exact?<br>--- --- --- --- - ----- ----- ------ ----- ----- ------<br> 0 9 3 4 1 0 10000000 192000000 96000000 48000000 YES
<br> 0 9 6 9 1 0 10000000 192000000 96000000 48000000 YES<br> 0 9 9 14 1 0 10000000 192000000 96000000 48000000 YES<br> 0 9 12 19 1 0 10000000 192000000 96000000 48000000 YES
<br><br clear="all">I modified CFG_PLPRCR (to 19194000) in u-boot config file to match this. But I'm getting only 45MHz output clock (not exactly 48MHz which is needed for USB to work) <br><br>If anyone can shed some info making the USB work on MPC885 with internal clock or changing the clock freq to exact 48MHz, it will be helpful.
<br><br>Thanks<br><br>-- <br>With best regards,<br>Prakash