Re: attempt at disable-bt

[Rin Okuyama <rokuyama.rk%gmail.com@localhost>]

Hi,

The easiest way to use plcom0 as console on RPI0W is to overwrite
bcm2835-rpi-zero-w.dtb with bcm2835-rpi-zero.dtb in your boot
partition, which forces firmware etc. to configure system as RPI0.

Currently, DTB overlay does not work for cumbersome problems;
see more details in the latest my reply to PR port-evbarm/54941:

	http://gnats.netbsd.org/54941

Thanks,
rin

On 2020/10/11 2:20, Patrick Welche wrote:
> I just tried to get com0 on the ARM PL011 UART of a rpi zero W by
>
> - grabbing https://github.com/raspberrypi/linux/blob/rpi-5.4.y/arch/arm/boot/dts/overlays/disable-bt-overlay.dts
> - removing the #include <dt-bindings/gpio/gpio.h> which from
>    https://nxr.netbsd.org/xref/src/sys/external/gpl2/dts/dist/include/dt-bindings/gpio/gpio.h
>    doesn't seem to be needed?
> - dtc -O dtb -o disable-bt-overlay.dtbo -b 0 -@ disable-bt-overlay.dts
> rpiz$ file /boot/dtb/overlays/disable-bt-overlay.dtbo
> /boot/dtb/overlays/disable-bt-overlay.dtbo: Device Tree Blob version 17, size=1073, boot CPU=0, string block size=145, DT structure block size=872
>
> - change config.txt to
> dtoverlay=disable-bt
> #enable_uart=1
> #force_turbo=0
>
> but still
>
> plcom0 at simplebus1: ARM PL011 UART
> plcom0: txfifo disabled
> plcom0: interrupting on icu irq 57
> bcmsdhost0 at simplebus1: SD HOST controller
> bcmsdhost0: interrupting on icu irq 56
> bsciic1 at simplebus1: Broadcom Serial Controller
> bsciic1: interrupting on icu irq 53
> iic1 at bsciic1: I2C bus
> com0 at simplebus1: BCM AUX UART, 1-byte FIFO
> com0: console
> com0: interrupting on icu irq 29
>
> What else needs to be done to make the PL011 "the" serial port?
>
>
> Cheers,
>
> Patrick