Takeshi OHASHI wrote... > ken>>> I am a beta tester of the new od driver. It almost works fine on some > ken>>> beta testers system, but we cannot redistribute without Mr. Akiyama's > ken>>> permit. > ken>> > ken>>Of course. Well, if he doesn't mind, I'd like to take a look at it at > some > ken>>point. > > He is preparing the review version of od-driver. Please wait some days.
Cool. > ken>>> I have a new question. If od driver is needless, why cd and da drivers > ken>>> are sepalate yet? Only difference is TOC ioctls, isn't it? > > ken>>It's true that the read/write interfaces of the two drivers are very > ken>>similar, but there are a number of other differences. They probably > could > ken>>be combined with some difficulty, but then there are booting concerns (if > ken>>everything is a DA device, how can you make sure you aren't booting off a > ken>>CDROM drive?), major numbers, and device names to think about as well. > > Thank you for your answer. > > I think this situation is like as OD devices. Some DVD-RAM/MO/PD > drives are recognized as DA and others are CD. For example, A PD media > is used as a DA on PD drives. The PD media is used as a CD on DVD-RAM > and DVD-ROM drives. It is very confusing. Sometime we want to disable > booting from these devices. It's a similar situation, but not the same. It's fairly difficult to boot off a CDROM drive, since the media is read-only. I've done it before, but it certainly isn't the usual case. A medium capable of read/write, however, could more easily be used for booting. The bottom line is, we want to avoid duplicating code if we can help it. If there is a good reason to have a separate OD driver, it can certainly be done. If it's only done so that PD drives have a different device name, I don't think that's enough to justify it. Ken -- Kenneth Merry k...@plutotech.com To Unsubscribe: send mail to majord...@freebsd.org with "unsubscribe freebsd-hackers" in the body of the message
