Tool/software: Linux
Hello,
I would like to configure the clock frequencies for the 500MHz speed grade of the AM5716. We have designed our own board with a 27MHz oszillator an run uboot and linux based on the linux processor sdk 3.3 (ti-processor-sdk-linux-rt-am57xx-evm-03.03.00.04-Linux-x86-Install.bin).
I changed the configuratiion as described in http://processors.wiki.ti.com/index.php/Linux_Porting_Guide_for_AM571x/AM570x_Speed_Grades .
Then I modiefied the Linux device tree by addition of the following lines at the end:
&cpu0 {
clock-frequency = <500000000>;
};
&cpu0_opp_table {
opp_nom@500000000 {
opp-hz = /bits/ 64 <500000000>;
opp-microvolt = <1060000 850000 1150000>;
opp-supported-hw = <0xFF 0x01>;
opp-suspend;
};
/delete-node/ opp_od@1176000000;
/delete-node/ opp_high@1500000000;
/delete-node/ opp_nom@1000000000;
};
&dpll_dsp_ck {
assigned-clock-rates = <500000000>;
};
&dpll_dsp_m2_ck {
assigned-clock-rates = <500000000>;
};
&dpll_dsp_m3x2_ck {
assigned-clock-rates = <333333332>;
};
After the system booted into Linux I checked the registers and the clock frequencies for the mpu and ddr were correct, but the dsp-core was still at 750MHz (value in register 0x4a005240 was 0x0000fa08).
Could someone explain to me, how to set the clock frequency for the dsp core?
Thank you,
Stephan
