Date: Tue, 28 Oct 1997 12:39:29 +1030 From: Mike Smith <mike@smith.net.au> To: Christoph Kukulies <kuku@gilberto.physik.RWTH-Aachen.DE> Cc: Peter Dufault <dufault@hda.com>, freebsd-hackers@freefall.FreeBSD.org Subject: Re: mmap/mlock problem Message-ID: <199710280209.MAA00972@word.smith.net.au> In-Reply-To: Your message of "Mon, 27 Oct 1997 15:11:39 BST." <19971027151139.61831@gil.physik.rwth-aachen.de>
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[memory-mapped peripheral's space appears to be cached] > There is a 80186 on the board which communicates > over some semaphores in the memory region with the outside world. > You write a command into the location and that location must read > as 0000 or FFFF if the board is ready or not resp.. Actually it's quite > weird - I have the source of a DOS program which communicates with > the board. (This is written for Borlandc/16 bit) Does the sample source attempt to invalidate the processor's cache for the region? Is it possible that your BIOS is set to consider the address range occupied by the card as cacheable? mike
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