Re: [9fans] 53c895 failed to INIT

[nigel@9fs.org]

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There is a problem with taking this approach, as I have already noted.

Time for some more detail. 

The 895 is capable of Ultra2 transfers. To do this it has a 4x clock multiplier,
not a 2x clock multiplier. Your settings pretend the 895 only has a 2x multiplier.

If you use these settings, then when sending data
to the disk, it will be sent 2x faster the disk expects. This may be OK, because
disks are often over specified, but it is risky for a fileserver.

If you wait a short time, I will post a modified version of scsincr53c8xx.c which
is better for you. Not perfect, but better.


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From: arisawa@ar.aichi-u.ac.jp
To: 9fans@cse.psu.edu
Subject: Re: [9fans] 53c895 failed to INIT
Date: Fri, 28 Jul 2000 06:08:07 -0400 (EDT)
Message-ID: <200007281008.GAA12337@cse.psu.edu>

Hello,

We can find the line:
#define SYM_895_DID	0x000c
in scsincr53c8xx.c. However it seems this is not used
anywhere.

We can also find following lines bellow the line.

{ SYM_875_DID,   0x01, "SYM53C875r1",	Burst128, 16, Prefetch|LocalRAM|BigFifo|Differential|Wide|Ultra },
{ SYM_875_DID,   0xff, "SYM53C875",	Burst128, 16, Prefetch|LocalRAM|BigFifo|Differential|Wide|Ultra|ClockDouble },
{ SYM_885_DID,   0xff, "SYM53C885",	Burst128, 16, Prefetch|LocalRAM|BigFifo|Wide|Ultra|ClockDouble },
{ SYM_896_DID,   0xff, "SYM53C896",	Burst128, 16, Prefetch|LocalRAM|BigFifo|Wide|Ultra|ClockDouble },

SYS53C895 does not apear here.
Therefore init fails.

Does it mean SYS53C895 is not supported?

I added entry:
{ SYM_895_DID,   0xff, "SYM53C895",	Burst128, 16, Prefetch|LocalRAM|BigFifo|Wide|Ultra|ClockDouble },
and ran 9pcfs (based on emelie), then I reached "config:" message without
error message.

now I am formatting....
I will report the result.

Kenji Arisawa
E-mail: arisawa@aichi-u.ac.jp