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About nikolaos1969

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    Greece, Athens

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  1. How is the Pi 4?
    How is the Pi 4?

    Now we could add JCAT USB Card XE thanks to the PCIe 2.0 x1 slot on the I/O board




  2. How is the Pi 4?
    How is the Pi 4?

    (Make sure that we're connecting Pi 4 to a reliable power source before the update is applied, and then it must be done with the official Raspberry Pi OS available @ https://downloads.raspberrypi.org/raspios_lite_armhf/images/raspios_lite_armhf-2020-08-24/2020-08-20-raspios-buster-armhf-lite.zip . There's no need to keep that micro SD card afterwards.)



    How to Boot Raspberry Pi 4 From a USB SSD or Flash Drive




    uhubctl does work to completely disable USB power on RPi4B. Make sure you update VL805 firmware to latest version (00137ad), and use latest uhubctl (version 2.2.0).


    FYI - piCorePlayer mentioned above already included uhubctl version 2.2.0










    Let's say USB drive is plugged into P1 and USB DAC / DDC is connected to P4 respectively, therefore P2 could be powered off right away


    sudo /home/tc/uhubctl -l2 -p2 -a0


    Same deal with P3


    sudo /home/tc/uhubctl -l2 -p3 -a0


    Finally we'll wait for a few minutes before powering off P1 while leaving P4 alone


    sleep 300;sudo /home/tc/uhubctl -l2 -p1 -a0


    Everything could be combined together as shown below


    sudo /home/tc/uhubctl -l2 -p2 -a0;sudo /home/tc/uhubctl -l2 -p3 -a0;sleep 300;sudo /home/tc/uhubctl -l2 -p1 -a0


    Squeezelite itself doesn't need to write anything back to the USB drive, therefore nothing will share the same bus with the USB DAC when 3 outta 4 USB ports are powered off.


    LMS itself doesn't run completely off RAM since the database is located at the USB drive, that's why I linked to a guide for running two units of Pi 4 separately with two different piCorePlayer images. (Support for TIDAL was removed from that specific image for LMS.)


    BTW, here's the link to get uhubctl for other distros



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