From: "Justin T. Gibbs" <gibbs@scsiguy.com>
To: Matthew Dharm <mdharm-kernel@one-eyed-alien.net>
Cc: Ookhoi <ookhoi@dds.nl>,
alan@lxorguk.ukuu.org.uk, linux-kernel@vger.kernel.org
Subject: Re: 2.4.9-ac17 Adaptec AIC7XXX problems (new driver, old one works fine) (solved)
Date: Sun, 30 Sep 2001 10:15:30 -0600 [thread overview]
Message-ID: <200109301615.f8UGFUY62492@aslan.scsiguy.com> (raw)
In-Reply-To: Your message of "Sun, 30 Sep 2001 00:03:27 PDT." <20010930000327.F2665@one-eyed-alien.net>
>Hrm... this makes me wonder if the Byte Merge option is keeping the PCI
>consistancy rules, or perhaps the aic7xxx driver is making assumptions
>about when PCI writes are actually occuring, without doing a read cycle
>between critical writes to make sure they actually happen.
See my other post on this subject. The driver knows that a read is
required to ensure that a write is posted, but assumes that 8bit
transactions are forwarded as such, writes are issued in the order
retired (we use a memory barrier to avoid the compiler using a
different order), and that reads cannot pass posted writes.
--
Justin
next prev parent reply other threads:[~2001-09-30 16:15 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-09-29 14:22 2.4.9-ac17 Adaptec AIC7XXX problems (new driver, old one works fine) Ookhoi
2001-09-29 14:43 ` arjan
2001-09-29 15:33 ` Ookhoi
2001-09-30 0:12 ` Justin T. Gibbs
2001-09-30 0:11 ` Justin T. Gibbs
2001-09-30 6:57 ` 2.4.9-ac17 Adaptec AIC7XXX problems (new driver, old one works fine) (solved) Ookhoi
2001-09-30 7:03 ` Matthew Dharm
2001-09-30 10:21 ` Gérard Roudier
2001-09-30 16:15 ` Justin T. Gibbs [this message]
2001-09-30 16:13 ` Justin T. Gibbs
2001-09-30 16:35 ` Justin T. Gibbs
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