1.DDR鎖頻命令：
echo "{class: ddr, res: fixed, val: 2736}" > /sys/kernel/debug/aop_send_message
echo "{class: ddr, res: fixed, val: 2092}" > /sys/kernel/debug/aop_send_message
echo "{class: ddr, res: fixed, val: 1804}" > /sys/kernel/debug/aop_send_message
echo "{class: ddr, res: fixed, val: 1555}" > /sys/kernel/debug/aop_send_message
echo "{class: ddr, res: fixed, val: 1353}" > /sys/kernel/debug/aop_send_message
echo "{class: ddr, res: fixed, val: 1300}" > /sys/kernel/debug/aop_send_message
echo "{class: ddr, res: fixed, val: 1017}" > /sys/kernel/debug/aop_send_message
echo "{class: ddr, res: fixed, val: 768}" > /sys/kernel/debug/aop_send_message
echo "{class: ddr, res: fixed, val: 681}" > /sys/kernel/debug/aop_send_message
echo "{class: ddr, res: fixed, val: 547}" > /sys/kernel/debug/aop_send_message
echo "{class: ddr, res: fixed, val: 451}" > /sys/kernel/debug/aop_send_message
echo "{class: ddr, res: fixed, val: 300}" > /sys/kernel/debug/aop_send_message

2.設(shè)定ddr最大頻率：
echo "active clk2 0 1 max 2092800 " > /sys/kernel/debug/rpm_send_msg/message
echo "active clk2 0 1 max 1804800 " > /sys/kernel/debug/rpm_send_msg/message
echo "active clk2 0 1 max 1555200 " > /sys/kernel/debug/rpm_send_msg/message
echo "active clk2 0 1 max 1017600 " > /sys/kernel/debug/rpm_send_msg/message
echo "active clk2 0 1 max 768000 " > /sys/kernel/debug/rpm_send_msg/message
echo "active clk2 0 1 max 547200 " > /sys/kernel/debug/rpm_send_msg/message
echo "active clk2 0 1 max 200000 " > /sys/kernel/debug/rpm_send_msg/message

3.查看ddr實時頻率：
cat /sys/kernel/debug/clk/measure_only_mccc_clk/clk_measure