Re: Raspberry Pi 3 and USB?

[mlelstv%serpens.de@localhost (Michael van Elst)]

john%ziaspace.com@localhost (John Klos) writes:

>> Here this happened almost always with more recent versions of the
>> firmware.
>>
>> I'm now using version 1458053248 and use "dtparam=audio=on" in config.txt,
>> and the problem seems to be gone.

>Google comes up with nothing even close for "1458053248". From where can I 
>get this? I see a place like this:

>https://github.com/Hexxeh/rpi-firmware/commits/master/bcm2710-rpi-3-b.dtb

This one seems to be more 'official'.

https://github.com/raspberrypi/firmware

>But I have no idea from where official firmware comes from, or where it's 
>stored...

Whatever 'official' is. There are regular updates but no releases. The
next best 'release' seems to be what is delivered with the OS images
like Raspbian.

dtparam=audio=on  seems to be necessary to power the relevant parts of
the chip. The firmware has at least 3 methods for how to be asked
from the running kernel, we use the oldest one. Linux doesn't (anymore?).

Our kernel also attaches a driver to the I2C0 interface which is
off limits on rpi3. The driver prevents it (among other things) from
controlling the power manager, i.e. undervoltage claims and
minimum clock speed.

-- 
-- 
                                Michael van Elst
Internet: mlelstv%serpens.de@localhost
                                "A potential Snark may lurk in every tree."