On 7/28/19 3:57 PM, hal wrote:
<snip>
Some searching says to add "core_freq=250" or "enable_uart=1" but
so far still nothing. Any suggestions are appreciated.
Hi,
I got the serial port working. It's a bit of a task. Apparently the
bluetooth integration messed up the serial port configuration so
when you boot, you're actually connected to the bluetooth chip
on /dev/ttyAMA0. You have to fiddle with /boot/config.txt and
/boot/cmdline.txt to restore the serial functionality.
Additionally, I had to launch a getty on /dev/ttyS0 since
the default starts on /dev/ttyAMA0.
Below is what I changed to get a serial port back on the UART
pins:
root@devuan:~# cat /boot/config.txt
## memory shared with the GPU
gpu_mem=128
## always audio
dtparam=audio=on
## maximum amps on usb ports
max_usb_current=1
## enable hardware-accelerated graphics
dtoverlay=vc4-kms-v3d
## kernel
kernel=kernel8.img
enable_uart=1
# core_freq=250 << not needed anymore when using enable_uart=1
# 2019-07-28 - disable bluetooth
dtoverlay=pi3-disable-bt
root@devuan:~# cat /boot/cmdline.txt
dwc_otg.lpm_enable=0 console=tty1 console=serial0,115200
root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline fsck.repair=yes
rootwait
root@devuan:~# tail -2 /etc/inittab
# T0:23:respawn:/sbin/agetty -L ttyAMA0 115200 vt100
T0:23:respawn:/sbin/agetty -L ttyS0 115200 vt100
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