Hi all.
I have a Banana Pi M1+ and I want to use it as a NAS using a SATA HDD (1TB).
I read this article
http://linux-sunxi.org/Cpufreq#Performance.2Ffunctionality_impacts
and I want to change the scaling_max_freq.
I installed the "Armbian_5.20_Bananapi_Debian_jessie_4.7.3" image.
But the maximum frequencies available is 960000.
I tried to compile the kernel by myself, changing the file
sources\linux-vanilla\v4.9.5\arch\arm\boot\dts\sun7i-a20.dtsi
as suggested in other posts.
cpu0: cpu@0 {
compatible = "arm,cortex-a7";
device_type = "cpu";
reg = <0>;
clocks = <&cpu>;
clock-latency = <244144>; /* 8 32k periods */
operating-points = <
/* kHz uV */
1200000 1500000
1152000 1500000
1104000 1450000
1056000 1450000
1008000 1450000
960000 1400000
912000 1400000
864000 1300000
720000 1200000
528000 1100000
312000 1000000
144000 1000000
>;
I changed also this row in compile.sh file
FORCE_CHECKOUT="no" # ignore manual changes to source
I verified that the file sources\linux-vanilla\v4.9.5\arch\arm\boot\dts\sun7i-a20.dtsi wasn't changed at the end of the compilation process. This is output of the compialtion:
linux-headers-next-sunxi_5.24_armhf.deb linux-image-next-sunxi_5.24_armhf.deb linux-firmware-image-next-sunxi_5.24_armhf.deb linux-u-boot-next-bananapipro_5.24_armhf.deb linux-dtb-next-sunxi_5.24_armhf.deb
I copied them on the Banana Pi and installed them with
dpkg -i *.deb
After rebooting, this is the output of the command "uname -a"
Linux bananapi 4.9.5-sunxi #4 SMP Tue Jan 24 11:33:41 CET 2017 armv7l GNU/Linux
and this is my "/etc/default/cpufrequtils"
ENABLE=true MIN_SPEED=480000 MAX_SPEED=1200000 GOVERNOR=ondemand
but the output of the command "cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies"
is still the same
144000 312000 528000 720000 864000 912000 960000
What is wrong? Can someone help me?
Thanks in advance.
P.S. During kernel compilation I changed the default configuration to choose the "ondemand" governor as default governor rather than "schedutil". This change was successfully applied after reboot.