i have a custom built Image (Pi-gen) wich is running on Kernel 5.4.83. I need to use the ttyAMA0 and therefore i have the bluetooth disabled via the config.txt:
# ttyAMA0/RS232 dtoverlay=pi3-disable-bt #dtoverlay=pi3-minuart-bt # I2C dtparam=i2c_arm=on # Enable UART enable_uart=1
now when i boot uboot seems to get stuck. The only output on serial i see is:
U-Boot 2020.01-g83cf4883ec (Mar 09 2021 - 08:11:03 +0000)
DRAM: 948 MiB
RPI 3 Model B (0xa22082)
When i comment the dtoverlay=pi3-disable-bt everything works fine.
I see that the Problem is known and in the Pi3 board integration Guide this Workaround is linked.
Now i cant get my head around how and where to apply this “patch”. Can someone help me to get my ttyAMA0 working ?