svn commit: r185059 - in head/sys: dev/acpica dev/sio isa kern
John Baldwin
jhb at freebsd.org
Tue Nov 18 13:13:32 PST 2008
On Tuesday 18 November 2008 04:01:54 pm John Baldwin wrote:
> Author: jhb
> Date: Tue Nov 18 21:01:54 2008
> New Revision: 185059
> URL: http://svn.freebsd.org/changeset/base/185059
>
> Log:
> Allow device hints to wire the unit numbers of devices.
> - An "at" hint now reserves a device name.
> - A new BUS_HINT_DEVICE_UNIT method is added to the bus interface. When
> determining the unit number of a device, this method is invoked to
> let the bus driver specify the unit of a device given a specific
> devclass. This is the only way a device can be given a name reserved
> via an "at" hint.
> - Implement BUS_HINT_DEVICE_UNIT() for the acpi(4) and isa(4) bus drivers.
> Both of these busses implement this by comparing the resources for a
> given hint device with the resources enumerated by ACPI/PnPBIOS and
> wire a unit if the hint resources are a subset of the "real" resources.
> - Use bus_hinted_children() for adding hinted devices on isa(4) busses
> now instead of doing it by hand.
> - Remove the unit kludging from sio(4) as it is no longer necessary.
Effectively this means that 'hint.uart.0.port=0x3f8' will wire 'uart0' to be
the serial port with an I/O port address of '0x3f8', even if it is not the
first serial port ACPI enumerates. This should mostly be a nop. However, it
should help machines where ACPI enumerates COM2 before COM1. With the
default hints, COM1 will now always be sio0/uart0, even if ACPI enumerates
COM2 first.
--
John Baldwin
More information about the svn-src-all
mailing list