PC (ISA) keyboard controller driver
pckbc* at isa? flags 0x00 (alpha, amd64, i386,
pckbc* at ebus? (sparc64)
pckbd* at pckbc?
pms* at pckbc?
pckbc driver handles resource allocation and device
attachment for the traditional PC/AT keyboard controller. It provides two
logical connections for child devices, the “keyboard” slot for a
keyboard and the “auxiliary” slot for mice (the latter might be
missing in older keyboard controllers).
To avoid attaching a phantom PS/2 keyboard device, the
pckbc driver will attempt to detect USB legacy
keyboard emulation on amd64 and i386 systems. Unfortunately, the detection
heuristics may fail on older systems with a real PS/2 keyboard. The keyboard
can be forced to attach on these systems, by changing the device flags to