Date: Thu, 11 Sep 1997 06:08:37 +0200 From: j@uriah.heep.sax.de (J Wunsch) To: freebsd-hackers@FreeBSD.ORG (FREEBSD) Cc: philippe.brun@eurocontrol.fr (BRUN Philippe) Subject: Re: Arinc device driver kvtop problem Message-ID: <19970911060837.CN01948@uriah.heep.sax.de> In-Reply-To: <199709101653.CAA04895@word.smith.net.au>; from Mike Smith on Sep 11, 1997 02:53:13 %2B1000 References: <34174307@brteec1> <199709101653.CAA04895@word.smith.net.au>
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As Mike Smith wrote: > This is outside the "ISA hole", and means that you can't use the iomem > approach. You probably can, but you can only use it as a hint to the driver which memory to map. Only the ``ISA hole'' is being mapped automatically, other adapter memory regions need to be mapped manually. > Until recently, FreeBSD didn't support main memory being fragmented (if > I remeber correctly). But that's IMHO not related to adapter memory. It has always been possible to make additional mappings. The X servers are using those, for example, to access linear frame buffers. They're arranging for their mapping via /dev/mem. A kernel driver would have to map the memory itself. (Maybe John or David can give a short instruction which steps are needed for this.) -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-)
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