linux-kernel - Re: sata_nv + ADMA + Samsung disk problem

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 04 Jan 2008 08:13:06 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Mark Lord <liml@....ca>
Cc:	Robert Hancock <hancockr@...w.ca>, Mark Lord <lkml@....ca>,
	Allen Martin <AMartin@...dia.com>,
	Jeff Garzik <jeff@...zik.org>, Tejun Heo <htejun@...il.com>,
	Gabor Gombas <gombasg@...aki.hu>, linux-kernel@...r.kernel.org,
	linux-ide@...r.kernel.org, Kuan Luo <kluo@...dia.com>,
	Peer Chen <pchen@...dia.com>
Subject: Re: sata_nv + ADMA + Samsung disk problem


> Another thing about the PacDigi core:  one has to be very careful
> to avoid sequential accesses to sequential PCI locations when
> programming the chip -- it cannot handle merged register writes.
> 
> So for any group of sequentially laid out registers, the code has
> to ensure it never writes two adjacent registers in sequence..

Ugh ? Write combining isn't permitted on normal registers afaik...

Ben.


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/