Date: Thu, 8 Apr 1999 20:15:31 +0100 (BST) From: Doug Rabson <dfr@nlsystems.com> To: Roger Hardiman <roger@cs.strath.ac.uk> Cc: hackers@freebsd.org, multimedia@freebsd.org Subject: Re: Bt848 corruption since upgrading to 3.1. Has DMA code changed? Message-ID: <Pine.BSF.4.05.9904082014380.74823-100000@herring.nlsystems.com> In-Reply-To: <370CB2DC.709E7CEA@cs.strath.ac.uk>
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On Thu, 8 Apr 1999, Roger Hardiman wrote: > Hi, > > Several people (including Luigi) have reported that video capture with > the bt848 driver is not working right since they upgraded from 2.2.6 or > 2.2.8 to 3.1-release > > Luigi and I noticed the problem in VIC (lots of horizontal lines in the > image) and others have rpeorted FXTV problems. > > It looks like a DMA problem. The DMA is either timing out or the bus > mastering is failing or the DMA transfer data is getting corrupted. > > Nothing has changed in the bt848 driver in this area since 2.2.x and I > tested with the vic from 2.2.6 a.out format pkg_add. > It looks like something has changed in the kernel's PCI bus setup code. > > > Does anyone know what is different in the 3.x kernel (compared to the > 2.2.x kernel) which could be causing this corruption. > > HELP! Try hexdumping all the configuration registers from both 2.2.x and current to see what the differences are. -- Doug Rabson Mail: dfr@nlsystems.com Nonlinear Systems Ltd. Phone: +44 181 442 9037 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-multimedia" in the body of the message
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