Re: Can't SSH to RPi5 unless booted with serial connection

On 8/14/26 12:48, Sadeep wrote:
> On 2026-08-14 11:10:52, Sadeep wrote:
>> Installed OpenBSD 7.9 on Raspberry Pi5. It seems to be working fine as
>> long as I boot with a serial. If I try to boot without serial, I see the
>> green light, even after ~5 mins, I can't SSH, don't see it in the
>> network (checked the client list in the router).
>>
> 
> Looks like the RX line floats without a serial adapter. Added an
> external pull-up and it now boots.
> 
> Not ideal, but at least I don't have to plug wires every time I reboot.

The capability seems to be built into the hardware at least.  Raspberry 
Pi OS has its pinctrl utility:

# pinctrl 14 ; pinctrl 15
14: a5    pn | hi // GPIO14 = TXD1
15: a5    pu | hi // GPIO15 = RXD1

But I am ignorant about how that would work, and the prerequisites ( 
e.g. modifying the device tree), in OpenBSD.

/Lars