Date: Thu, 8 Dec 2005 15:13:00 +1100 (EST) From: Bruce Evans <bde@zeta.org.au> To: Joe Rhett <jrhett@svcolo.com> Cc: hardware@FreeBSD.org, John Baldwin <jhb@FreeBSD.org>, freebsd-hardware@FreeBSD.org Subject: Re: com1 incorrectly associated with ttyd1, com2 with ttyd0 Message-ID: <20051208145124.C63825@delplex.bde.org> In-Reply-To: <20051205200546.GB13194@svcolo.com> References: <20051117050336.GB67653@svcolo.com> <200511171030.36633.jhb@freebsd.org> <20051117220358.GA65127@svcolo.com> <20051130181757.GA29686@svcolo.com> <20051201204625.W41849@delplex.bde.org> <20051205200546.GB13194@svcolo.com>
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On Mon, 5 Dec 2005, Joe Rhett wrote: > On Thu, Dec 01, 2005 at 08:58:04PM +1100, Bruce Evans wrote: >> It's not clear that disabling in the BIOS should disable for all OSes. > > What? That's a fairly weird interpretation. If I want to disable inside a > given OS, I do that inside the OS. If I want to disable for _ALL_ OSes, > then I disable in the BIOS. What reasonable logic can argue otherwise? The BIOS might not be layered under _all_ OSes, either due to its design or implementation, or OSes not understanding how to talk to the BIOS, or there being no way to talk BIOS. >> Don't know. I avoid ACPI if possible :-). I suspect that FreeBSD can see >> ACPI tables but not all BIOS tables, so any soft disabling in the BIOS gets >> lost. > > Can you really use everything without ACPI? What is lost by disabling ACPI? > Don't you lose power-down support at the least? > (I did look for a FAQ on ACPI and found darn little) It's system-dependent. ACPI is now essential for most portable computers. I don't have one , and lose only faster interrupt handing via the APIC on workstations. This is a small loss since the APIC is broken on 1/2 of my systems that have both ACPI and APIC so APIC cannot be configured on one, and the other one doesn't do much interrupt handling or benchmarks thereof so I don't care if it would have faster interrupt handling using APIC. Bruce
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