Date: Tue, 18 Nov 2008 16:06:22 -0500 From: John Baldwin <jhb@freebsd.org> To: src-committers@freebsd.org Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org Subject: Re: svn commit: r185059 - in head/sys: dev/acpica dev/sio isa kern Message-ID: <200811181606.23202.jhb@freebsd.org> In-Reply-To: <200811182101.mAIL1sFK088852@svn.freebsd.org> References: <200811182101.mAIL1sFK088852@svn.freebsd.org>
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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
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