43 Tuning Clock

V0.0.1

43.1 Histroy

• 2014-12-12, rayoslee, release V0.0.1

43.2 FAQ

1. How to dynamically read/write CPU and UPLL clock in S605 ?

   • Please patch cpu.c and w55fa93.c then rebuild it
   • You can type below command to read the UPLL/SYS/CPU/HCLK(AHB)/APB clock (KHz)
     • cat /sys/devices/platform/w55fa93-clk/clock
   • You can type below command to write the UPLL or CPU (MHz)
     • echo CPU_clock(MHz) > /sys/devices/platform/w55fa93-clk/clock (ex: CPU_clock = 48)
     • echo CPU_clock:UPLL_clock(MHz) > /sys/devices/platform/w55fa93-clk/clock (ex: 48:48)
   • CPU_clock can decrease to UPLL_clock/8