Date: Thu, 08 Apr 1999 16:59:51 +0100 From: Roger Hardiman <roger@cs.strath.ac.uk> To: Wes Peters <wes@softweyr.com> Cc: hackers@FreeBSD.ORG, multimedia@FreeBSD.ORG Subject: Re: Bt848 corruption since upgrading to 3.1. Has DMA code changed? Message-ID: <370CD277.E9A64E04@cs.strath.ac.uk> References: <370CB2DC.709E7CEA@cs.strath.ac.uk> <370CAA37.3645E2B9@softweyr.com>
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Wes,
> Does the driver explicitly turn on PCI bus mastering on the card? The
> PCI initialization code no longer does this. This change bit the fxp
> driver on some machines where the BIOS doesn't initialize bus mastering
> on the card.
The driver has this code which enables the Bus Mastering.
It was added back in the days of 3.0-current (about 12 months ago) when
the driver
was common to 2.2.x and 3.x. That is why there is a #if around the code.
#if __FreeBSD__ > 2
fun = pci_conf_read(tag, PCI_COMMAND_STATUS_REG);
pci_conf_write(tag, PCI_COMMAND_STATUS_REG, fun | 4);
#endif
Any other suggestions I can check?
Bye
Roger
--
Roger Hardiman
Strathclyde Uni Telepresence Research Group, Glasgow, Scotland.
http://telepresence.dmem.strath.ac.uk 0141 548 2897
roger@cs.strath.ac.uk
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