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Date:      Sat, 26 Jun 1999 00:13:42 +0200 (CEST)
From:      jaco@titine.fr.eu.org (Eric Jacoboni)
To:        freebsd-questions@FreeBSD.ORG
Subject:   IDE DMA and 'multi-block'
Message-ID:  <19990625221342.815A615669@titine.fr.eu.org>

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From: Eric Jacoboni <jaco@titine.fr.eu.org>
Date: 26 Jun 1999 00:13:42 +0200
In-Reply-To: Greg Lehey's message of "Fri, 18 Jun 1999 08:34:45 +0930"
Message-ID: <87yah8vsh5.fsf_-_@titine.fr.eu.org>
Lines: 33

Hi, 

I've noticed something i don't explain about my 2 IDE disks :

# uname -r
3.2-STABLE 
# dmesg | grep wdc0
wdc0 at 0x1f0-0x1f7 irq 14 flags 0xa0ffa0ff on isa
wdc0: unit 0 (wd0): <QUANTUM FIREBALL1280A>, DMA, 32-bit, multi-block-8
wdc0: unit 1 (wd1): <QUANTUM FIREBALL_TM2550A>, DMA, 32-bit, multi-block-16 

Ok, both disks are in DMA 32 bit mode, but why the first one is said
'multi-block-8' and the second 'multi-block-16' ?

As i've understood the docs, the flags '0xa0ffa0ff' mean :

- 0xa0ff for wd0 : probe 32 bit transfers + probe PCI IDE DMA + max
transfer size
- 0xa0ff for wd1 : same thing...

Both drives are Quantum FireBall IDE disks, the first one is a 1.2 Go,
while the second one is a 2.5 Go : is it this size difference that
explains the 'multi-block' difference ?

BTW : what is the real meaning of this 'multi-block' value and what
are its implications ?

Thanks in advance,

-- 
---------------------------------------------------------
Éric Jacoboni       « No sport, cigars! »  (W. Churchill)
---------------------------------------------------------


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