Date: Mon, 20 Nov 2000 15:29:19 -0800 (PST) From: "Rodney W. Grimes" <freebsd@gndrsh.dnsmgr.net> To: jhb@FreeBSD.ORG (John Baldwin) Cc: roelof@eboa.com, stable@FreeBSD.ORG, Cy.Schubert@uumail.gov.bc.ca, bfoz@glue.umd.edu, imp@village.org Subject: Re: Dangerously Dedicated Message-ID: <200011202329.PAA19970@gndrsh.dnsmgr.net> In-Reply-To: <XFMail.001120125602.jhb@FreeBSD.org> from John Baldwin at "Nov 20, 2000 12:56:02 pm"
next in thread | previous in thread | raw e-mail | index | archive | help
... > > Seems people are getting very confused here about what the BIOS cares > > about and what cares about the partition table, what the specs say and > > what software is actually doing what. > > This is true, but incomplete. :( To help deal with the problem of getting the > BIOS to use a geometry that is the same as the one the OS uses to talk to it, > some newer SCSI BIOS's examine the MBR to extract the geometry from that and > then talk in that geometry. In this way, they can conform to any valid MBR, > and you don't have problems with the geometry of the drive and the MBR being > out of sync. Our bogus MBR in boot1 that is used by dangerously > dedicated mode > breaks this though, resulting in machines whose BIOS get a divide by zero > fault > when they try to read from the disk. The divide by zero fault is an actual BIOS implementation bug, and as far as I know Adaptec and Symbios have corrected their code. See other mail. -- Rod Grimes - KD7CAX @ CN85sl - (RWG25) rgrimes@gndrsh.dnsmgr.net To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200011202329.PAA19970>