Date: Wed, 29 Mar 2006 14:22:30 -0500 From: Brian Fundakowski Feldman <green@FreeBSD.org> To: Nate Lawson <njl@FreeBSD.org> Cc: cvs-src@FreeBSD.org, src-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/dev/acpica/Osd OsdHardware.c Message-ID: <20060329192230.GH68291@green.homeunix.org> In-Reply-To: <200603290641.k2T6fuMM008597@repoman.freebsd.org> References: <200603290641.k2T6fuMM008597@repoman.freebsd.org>
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On Wed, Mar 29, 2006 at 06:41:56AM +0000, Nate Lawson wrote: > njl 2006-03-29 06:41:56 UTC > > FreeBSD src repository > > Modified files: > sys/dev/acpica/Osd OsdHardware.c > Log: > Add a blacklist for bad IO ports that AML should never touch. It seems > some systems were designed so that AML writes to various resources shared > with OS drivers, including the RTC, PIC, PCI, etc. These writes could > collide with writes by the OS and should never be performed. For now, we > print a message if such an access occurs, but do not block it. To block > the access, the tunable "debug.acpi.block_bad_io" can be set to 1. In the > future, we will flip the switch and this will become the default. > > Information about this problem was found in Microsoft KB 283649. They > block IO accesses if the BIOS indicates via _OSI that it is Windows 2001 > or higher. They always block accesses to the PIC, cascaded PIC, and ELCRs, > no matter how old the BIOS. Windows 2001 or higher? -- Brian Fundakowski Feldman \'[ FreeBSD ]''''''''''\ <> green@FreeBSD.org \ The Power to Serve! \ Opinions expressed are my own. \,,,,,,,,,,,,,,,,,,,,,,\
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