There are no dtoverlays using Debian, they are on Raspberry OS.
On 6/17/22 7:34 PM, Lennart Sorensen wrote:
> On Fri, Jun 17, 2022 at 06:45:02PM -0500, Steve Fatula wrote:
>> Is there anyway to get an attached serial port working on Debian and
>> raspberry PI 4? It appears the tested installs want to use it as a serial
>> console, I do not. I want to use UART1, the PL011, as an RS232 port to a
>> projector.
>>
>> I can do this using Raspberry OS, but, not Debian using the tested installs.
>> There is no way to disable Bluetooth via the overlays used on Raspberry OS.
>> I can sort of mess around and stop the console from being started on ttyS1,
>> but no way to use the port as a serial port to send and received data.
>> Apparently the dtoverlays are not there.
>>
>> So, is there any way to really use a serial port, attached to any GPIO pins,
>> as a real RS232 port using Debian images? if so, what do I need to disable
>> or enable?
>>
>> As mentioned, had it working on Raspberry OS which is based on Bullseye. But
>> unfortunately I can't use Raspberry OS for our usage.
> From what I have read you should be able to enable uart2 through uart5
> on the Pi4B using the dts overlays. I don't have a Pi4 yet so no
> experience with doing that unfortunately.
>
> https://forums.raspberrypi.com/viewtopic.php?t=244827 seems to have some
> talk about it though.
>