Date: Fri, 02 Nov 2007 11:41:07 +0100 From: =?ISO-8859-1?Q?S=F8ren_Schmidt?= <sos@deepcore.dk> To: Alexander Sabourenkov <screwdriver@lxnt.info> Cc: freebsd-hackers@FreeBSD.ORG, sos@FreeBSD.ORG, freebsd-current@FreeBSD.ORG, "Matthew D. Fuller" <fullermd@over-yonder.net>, Thierry Herbelot <thierry@herbelot.com> Subject: Re: Patch RFC: Promise SATA300 TX4 hardware bug workaround. Message-ID: <472AFEC3.7090001@deepcore.dk> In-Reply-To: <472AFB75.1070207@deepcore.dk> References: <472A548B.50406@lxnt.info> <472AFB75.1070207@deepcore.dk>
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S=F8ren Schmidt wrote: > Good catch! > > However from my quick glimpse at the Promise sources the limit seems=20 > to be 32 Dwords ie 32*4 =3D 128bytes. > I'll investigate further and ask Promise for the gory details, stay=20 > tuned... > I dont think the PRD count limitation is a real problem, I've newer=20 > seen that long a list and IIRC we newer do more than 64K transfers in=20 > one go (yet). > Anyhow I need to get checks in for that not just here... > > Give me a few days and I'll get this figured out for 7-rel... Oh, and I forgot, do you have a surefire way to reproduce the problem so = the fix can be tested ? I've newer been able to trigger this problem myself so far. -S=F8ren
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