> In which OpenBSD file do I define the major number for devices (both

quoted text
> regular and pseudo-device)? I have searched in several sources, and

> the closest answer was for NetBSD, which says that major numbers are

> in /usr/src/sys/conf/majors. But I have not found this file in OpenBSD

> sources.

Noone builds new block devices anymore (in OpenBSD, we instead write

drivers which hide behind the scsi subsystem, since this is more

flexible).
As for strictly character devices, these are inserted per-architecture

into the cdevsw[] arrays in arch/ARCH/ARCH/conf.c.  At the same time,

/usr/src/etc/etc.ARCH/MAKEDEV* have to be modified to create the

device nodes.
There is no need to keep the major numbers in sync between different

architectures.  Actually because of many historical reasons, it is

impossible.