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 _______________________________________________ svn-src-all@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "[EMAIL PROTECTED]"
