[3323] in linux-scsi channel archive
Re: SCSI host numbering (patch)
daemon@ATHENA.MIT.EDU (Dario_Ballabio)
Sat Feb 14 06:35:43 1998
Date: Sat, 14 Feb 1998 12:11:45 +0100
From: Dario_Ballabio@milano.europe.dg.com (Dario_Ballabio)
To: linux-scsi@vger.rutgers.edu
%UATTACH
>
>OK. I include an experimental patch for 2.1.86 drivers/scsi/hosts.c
>which is applying it. Please test it and send me your comments.
>At present I have no possibility to test it with anything more than ppa
>driver :(
>So anybody who could test it with more than one scsi host
>(especially as modules - which are being removed and loaded again) is
>welcome.
>
>With regards
>--
>=======================================================================
> Andrzej M. Krzysztofowicz
>Faculty of Applied Phys. & Math., Technical University of Gdansk
Actually it is quite possible to have a scsi driver compiled into
the kernel which activates a group of scsi boards. At a later time
the _same_ scsi driver can be loaded as a module and it can take control
of another group of scsi boards. I do this in my normal working
environment in which the eata driver is compiled into the kernel
and takes the boot time options "eata=0x5c88" in order to initialize
only the eata board in eisa slot 5. At a later time I insmod eata.o
which initializes all the other eata boards.
[note that while eata is compiled into the kernel, the eata.o module is
simply created by the following command line:
gcc -D__KERNEL__ -I/usr/src/linux/include -Wall -Wstrict-prototypes -O2 \
-fomit-frame-pointer -fno-strength-reduce -pipe -m486 -malign-loops=2 \
-malign-jumps=2 -malign-functions=2 -DCPU=586 -DMODULE -c -o eata.o eata.c
and copied into the appropriate directory.]
So your patch should take into account the fact that two instances of the
same scsi driver can be simoultaneously active.....
Moreover when a scsi driver is loaded it can selectively initialize
potentially different boards each time, accordingly to the options
specified for that particular insmod instance.
Cheers,
+--------------------------------+--------------------------------------+
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