Date: Sat, 11 May 1996 03:44:41 -0700 (PDT) From: asami@cs.berkeley.edu (Satoshi Asami) To: bde@zeta.org.au Cc: jgreco@brasil.moneng.mei.com, current@freebsd.org, nisha@cs.berkeley.edu Subject: Re: more than 32 scsi disks on a single machine ? Message-ID: <199605111044.DAA19770@silvia.HIP.Berkeley.EDU> In-Reply-To: <199605101430.AAA17773@godzilla.zeta.org.au> (message from Bruce Evans on Sat, 11 May 1996 00:30:45 %2B1000)
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* You mostly preserved compatibility with the existing device nodes, provided * everything uses the dk macros and functions. Well if they don't use them, they just won't be able to see disks > 32. :> * I use 6 TYPE bits in the floppy driver. Committing this has been * waiting about 1.5 years because I don't want to rearrange everyone's fd * minors. Please bits from the top of the original TYPE. PART2 should be * taking from the top too. You mean both UNIT2 and PART2 should have been taken from the highest bit? Well I guess that's ok as long as there isn't a device that uses both (Julian, what was the PART2 for?).... By the way, should I avoid the MSB for sign-extension problems? * Watch out for the scsictl bit in MAKEDEV. According to MAKEDEV, scsictl is 0x20000000. We'll run into it in a major way if we try to take some (contiguous) bits from the top. * `unit' is now evaluated multiply and there are too many columns. I can put in a \ for the columns, but I didn't think multiple evaluation of units was bad. I thought people aren't supposed to do mkmakeminor(unit++, slice, part) kind of stuff with macros anyway. Should I use a gcc extension or something to save the value of unit to a temporary variable? * `dev' is now evaluated multiply and there are too many columns. Ok ok.... ;) * The type bits now overlap ... You mean with the 6 bits you are using? * scsictl should have been a `type' bit. Maybe it is :-). Well it *is* in there. :) * devfs should be finished so that minor numbers become irrelevant. I think that's the best solution too! (Ok, letting someone else do the work, my favorite means of accomplishing the goal. :) Satoshi
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