NAME
pckbc —
PC (ISA) keyboard controller
driver
SYNOPSIS
pckbc* at isa? flags 0x00 (alpha, amd64,
i386, loongson)
pckbc* at acpi? flags 0x00 (amd64)
pckbc* at ebus? (sparc64)
pckbd* at pckbc?
pms* at pckbc?
DESCRIPTION
The pckbc driver handles resource
allocation and device attachment for the traditional PC/AT keyboard
controller, or emulations thereof. It provides up to 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, or recent emulations).
To avoid attaching a phantom PS/2 keyboard device, the
isa(4)
attachment of 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 1.
The acpi(4) attachment of the pckbc driver
defaults to attach only where it would perform better than its legacy
isa(4)
attachment. Should this logic be insufficient, it is possible to force it to
always attach, by changing its device flags to 1.
SEE ALSO
acpi(4), ebus(4), intro(4), isa(4), pckbd(4), pms(4), boot_config(8)