Date: Thu, 18 Mar 2021 10:00:53 -0700 From: bob prohaska <fbsd@www.zefox.net> To: freebsd-arm@freebsd.org Subject: RPI4 clock speeds and serial port Message-ID: <20210318170053.GA26688@www.zefox.net>
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Having now got an 8GB Pi4 to use for FreeBSD the machine seems to be relatively slow at buildworld, taking some 18 hours for a clean start buildworld. Sysctl -a | grep freq reports in part: .... hw.cpufreq.turbo: 0 hw.cpufreq.sdram_freq: 400000000 hw.cpufreq.core_freq: 200000000 hw.cpufreq.arm_freq: 600000000 hw.clock.108MHz-clock.frequency: 0 hw.clock.27MHz-clock.frequency: 0 hw.clock.otg.frequency: 0 hw.clock.osc.frequency: 0 dev.iicbus.0.frequency: 100000 dev.cpufreq.0.freq_driver: bcm2835_cpufreq0 dev.cpufreq.0.%parent: cpu0 dev.cpufreq.0.%pnpinfo: dev.cpufreq.0.%location: dev.cpufreq.0.%driver: cpufreq dev.cpufreq.0.%desc: dev.cpufreq.%parent: dev.bcm2835_cpufreq.0.freq_settings: 1500/-1 600/-1 dev.bcm2835_cpufreq.0.%parent: cpu0 dev.bcm2835_cpufreq.0.%pnpinfo: dev.bcm2835_cpufreq.0.%location: dev.bcm2835_cpufreq.0.%driver: bcm2835_cpufreq dev.bcm2835_cpufreq.0.%desc: CPU Frequency Control dev.bcm2835_cpufreq.%parent: dev.cpu.0.freq_levels: 1500/-1 600/-1 dev.cpu.0.freq: 600 dev.iichb.0.frequency: 100000 /boot/msdos/config.txt contains root@nemesis:~ # more /boot/msdos/config.txt [all] arm_64bit=1 dtparam=audio=on,i2c_arm=on,spi=on dtoverlay=mmc dtoverlay=disable-bt device_tree_address=0x4000 kernel=u-boot.bin [pi4] #hdmi_safe=1 armstub=armstub8-gic.bin There is no /boot/msdos/cmdline.txt file. Can one change the cpu speed without disturbing the serial console by using something like arm_freq=1750 in config.txt, provided adequate cooling provisions are made? I'd rather not complicate use of the serial console at this point. Thanks for reading! bob prohaska
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