Am 04.08.20 um 21:46 schrieb ng0177(a)gmail.com:
Thanks. Just out of curiosity, how can I use "dmesg" w/o
In general there are two options
1) connect via SSH (not sure this a real option because this service
could be disabled per default)
2) connect via debug UART (requires serial to USB adapter)
An alternative solution would be try to mount the SD card on a PC and
look for the kernel messages in /var/log
On Mon, Aug 3, 2020 at 7:37 PM Stefan Wahren <stefan.wahren(a)i2se.com
Am 03.08.20 um 12:04 schrieb Peter Robinson:
> On Mon, Aug 3, 2020 at 10:57 AM <ng0177(a)gmail.com
>> I used today's rawhide image from
and get to the Welcome screen but then neither USB keyboard nor
mouse work and I am stuck on my RPi4/8GB.
> I don't think the support for loading the USB firmware on the 8Gb
> model has made it upstream yet. In the 1/2/4gb models it was
> the Raspberry Pi firmware from SPI flash, in the 8Gb model they
> dropped the SPI flash and there has to be kernel patches to load it.
> That problem is unrelated to the CMA/DMA issue.
the USB quirk is available in Linux 5.8 , but there is a related
It seems to be related to the board revision and possibly arm64.
A dmesg output might be helpful.
 - https://github.com/raspberrypi/linux/issues/3747