Date: Thu, 30 Jan 1997 19:37:49 -0800 From: David Greenman <dg@root.com> To: Simon Shapiro <Shimon@i-Connect.Net> Cc: Julian Elischer <julian@whistle.com>, freebsd-scsi@freebsd.org Subject: Re: NewComer Questions... Message-ID: <199701310337.TAA27509@root.com> In-Reply-To: Your message of "Thu, 30 Jan 1997 12:44:23 PST." <XFMail.970130154549.Shimon@i-Connect.Net>
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>> > 2. Naming conventions for /dev entries for such beasts.
>> /dev/{r}sd[0-9][0-9]
>> there is a limit at the moment to about 32 drives per machine
>> (I think) but it's a rather artificial limit
>> and could be removed relativly easily.
>
>Good. How is this limit imposed? I need to know.
>We can have sd0-sdf. What we need is either sd00-sdff or (better?)
>c[0-f]b[0-f]d[00-ff]s[0-400][a-h]. This gives you exactly 32 bits
>minors which I noticed FreeBSD to use already.
The "-current" limit is 512 disk devices...sd0 through sd511. I plan to
bring this change into the 2.2 branch perhaps as early as tonight.
>When the initializing routines are running, are interrupts enabled?
That's a difficult question. It depends on which version of FreeBSD and
what type of device (PCI/ISA) it is. Bruce might know the answer more
specifically.
>Is the VM totally functional?
Yes, the VM system is initialized prior to any device probes/attaches.
> Can one sleep in the initializing?
No, but you can DELAY().
-DG
David Greenman
Core-team/Principal Architect, The FreeBSD Project
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