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From: julian@tfs.com (Julian Elischer)
Subject: Re: The ultimate 386BSD machine? (FAQ fodder)
Message-ID: <1992Oct9.165758.935@tfs.com>
Keywords: 386BSD
Organization: TRW Financial Systems
References: <1992Oct8.072512.8700@elroy.jpl.nasa.gov> <Bvsss4.9nz@ibmpcug.co.uk> <1992Oct8.164919.14096@eab.retix.com>
Date: Fri, 9 Oct 1992 16:57:58 GMT
Lines: 48
In article <1992Oct8.164919.14096@eab.retix.com> erik@eab.retix.com (Erik Forsberg) writes:
>In article <Bvsss4.9nz@ibmpcug.co.uk> adrian@ibmpcug.co.uk (Superuser) writes:
>>In article <1992Oct8.072512.8700@elroy.jpl.nasa.gov> earle@elroy.jpl.nasa.gov (Greg Earle - Gainfully Unemployed) writes:
>>> As an adjunct to this, I expect Julian to jump in with "But an Adaptec 1742A
>>> is supported with my new SCSI subsystem ... ". Fine, but can one get the
>>> system up first (with it installed) to get to the point where one can
>>> recompile the kernel with the new SCSI subsystem?
>>>
>>
>>Julians SCSI system works by setting th 1742B into 1542 mode, and then
>>when the probe works out its a 1742, it shoves the card into enhanced
>>mode itself.
>>
>
>This seems to be a BAD approach. It would EXCLUDE all existing 1740 cards
>from functioning. ONLY the newer 1740A (and obviously 1742A) allows switching
>between standard and enhanced mode at runtime. The older 1740 (which probably
>still is the most common Adaptec EISA card out there) requires you to
>download firmware that is specific to the operating mode.
>
>So, useful support for Adaptec 1740 cards, requires support for enhanced
>mode in everything (boot blocks, standalone boots and kernels).
I do not set the 1740 to standard mode and then move it to enhanced
mode. When I get the board, I set it into enhanced
mode. However I make no assumptions
about what mode it is already in.
Obviously if you wanted to run it in standard mode then you would use the 1542
driver instead. (However I wouldn't recommend it as the 1542 emulation
ona 1740 has BUGS)
Theoretically the new boot blocks should support the 1740 in extended mode
(but at present seem to only be able to boot
a partition starting at the beginning of the disk..(I'm working on it))
>
>--
>---------------------------------------------------------------------------
>Erik Forsberg, erik@eab.retix.com Phone: (310) 476-7133 FAX: (310) 476-7657
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