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.
pdf mfi mfn mfd s dbrmo dpref dpgdck jdbck gclk2 exact?
--- --- --- --- - ----- ----- ------ ----- ----- ------
0 9 3 4 1 0 10000000 192000000 96000000 48000000 YES
0 9 6 9 1 0 10000000 192000000 96000000 48000000 YES
0 9 9 14 1 0 10000000 192000000 96000000 48000000 YES
0 9 12 19 1 0 10000000 192000000 96000000 48000000 YES
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)
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.
Thanks
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With best regards,
Prakash
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