Date: Sat, 20 Mar 2004 10:45:21 -0800 (PST) From: "M. Warner Losh" <imp@bsdimp.com> To: marcel@xcllnt.net Cc: cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/conf files src/sys/dev/uart uart_cpu.h uart_cpu_alpha.c uart_cpu_amd64.c uart_cpu_i386.c uart_cpu_ia64.c uart_cpu_pc98.c uart_cpu_sparc64.c uart_subr.c Message-ID: <20040320.104521.08405415.imp@bsdimp.com> In-Reply-To: <20040320085431.GA74398@dhcp01.pn.xcllnt.net> References: <200403200214.i2K2E3ps052217@repoman.freebsd.org> <20040320080027.GC567@funkthat.com> <20040320085431.GA74398@dhcp01.pn.xcllnt.net>
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In message: <20040320085431.GA74398@dhcp01.pn.xcllnt.net>
Marcel Moolenaar <marcel@xcllnt.net> writes:
: Probe order is irrelevant if you specify the device by its I/O port
: or memory mapped I/O address.
Only for devices that have fixed addresses. This wouldn't be true for
devices on the PCI bus, where probe order could affect the resources
assigned to a given device. The only real way for self-enumearting
busses are a bus-specific address.
: When you need to pinpoint a device
: prior to any form of bus enumeration, the unit number is meaningless
: and any mechanism that includes a unit number is bogus. That's why
: hints are the wrong tool for pinpointing a console or debug port.
Agreed.
Warner
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