Go to advanced search

by montana
Thu Sep 26, 2019 7:03 pm
Forum: Device Tree
Topic: What is fix for RPI 4 uart?
Replies: 10
Views: 2557

Re: What is fix for RPI 4 uart?

i can see data if i double baudrate of serial port. That is a fix proposed in topic i mentioned in my question. But i can't use this "fix" for many reasons. Also, "rpi-update" fixes this issue. But it replaces kernel and dtb files. And git repo does not contain fixed sources. So i can't build my own...
by montana
Wed Sep 25, 2019 5:31 pm
Forum: Device Tree
Topic: What is fix for RPI 4 uart?
Replies: 10
Views: 2557

Re: What is fix for RPI 4 uart?

[email protected]:/home/pi# vcgencmd measure_clock core frequency(1)=500000992 [email protected]:/home/pi# cat /sys/kernel/debug/clk/vpu/clk_rate 500000000 [email protected]:/home/pi# while true; do true; done & [1] 2485 [email protected]:/home/pi# vcgencmd measure_clock core frequency(1)=500000992 roo...
by montana
Wed Sep 25, 2019 3:43 pm
Forum: Device Tree
Topic: What is fix for RPI 4 uart?
Replies: 10
Views: 2557

Re: What is fix for RPI 4 uart?

dtparam=audio=on [pi4] # Enable DRM VC4 V3D driver on top of the dispmanx display stack dtoverlay=vc4-fkms-v3d max_framebuffers=2 [all] enable_uart=1 i am not actually sure how config.txt affects changes applied by rpi-update. Because after rpi-update serial port works as expected. When i copy my o...
by montana
Tue Sep 24, 2019 9:33 pm
Forum: Device Tree
Topic: What is fix for RPI 4 uart?
Replies: 10
Views: 2557

What is fix for RPI 4 uart?

So, i've read topic https://www.raspberrypi.org/forums/viewtopic.php?t=244991 And i believe "rpi-update" works. But we use custom kernels with custom dtb files. And after recompiling latest 4.19 kernel - uart does not work with the same symptoms. Can anyone provide what exactly was fixed in dtb or i...

Go to advanced search