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Date:      Sun, 12 Mar 1995 17:19:14 +1000
From:      Bruce Evans <bde@zeta.org.au>
To:        phk@ref.tfs.com, rgrimes@gndrsh.aac.dev.com
Cc:        freebsd-hackers@FreeBSD.org, steve2@genesis.tiac.net
Subject:   Re: configuring 2 Ultrastore U24F cards in 1 system
Message-ID:  <199503120719.RAA06823@godzilla.zeta.org.au>

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>> LKM's are working in 2.0, they have been used mostly for file systems
>> and some of the networking code.  There currently are no LKM device
>> drivers and more work must be done to the device driver layer before
>> it is reasonable to start doing LKM device drivers.

>With the modification that it is almost no problem to do it for a scsi-
>driver since the problem really is cdevsw/bdevsw...

The main problem is that device drivers think that they own the machine
and do things like DELAY(1000000 * SCSI_DELAY) (busy wait for a GENERIC
value of 15 seconds for each controller) and would probably have many
races if they gave up control.

Bruce



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