Daniel Ng99 wrote:
MPC8247 Clock Configuration
- Bus-to-Core Mult 5x, VCO Div 2, 60x Bus Freq 20-60 , Core Freq 100-300
- dfbrg 1, corecnf 0x1b, busdf 7, cpmdf 1, plldf 0, pllmf 7, pcidf 7
- vco_out 528000000, scc_clk 132000000, brg_clk 33000000
- cpu_clk 330000000, cpm_clk 264000000, bus_clk 66000000
So maybe 35 x 2 = 70 is the correct value?
Anyway, I tried all these but still they made no difference:
clock-frequency = <35>
clock-frequency = <0x23>
clock-frequency = <115200>
clock-frequency = <1c200>
clock-frequency = <70>
clock-frequency = <17>
clock-frequency = <66>
clock-frequency = <33>
Can you suggest any other values?
Don't set it to the BRG divider, set it to the BRG *input* clock, which
appears to be 33000000.
What is the effect of just not calling set_brg()? I still get console
output, so am I setting myself up for some sort of problem in the future?
You will not be able to change the baud rate from Linux.
What is the effect of setting "fsl,cpm-brg = <0>" in the 'serial' device
tree node?
You'll have an invalid device tree, which will cause the kernel to write
to a reserved register.
-Scott
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