Date: Mon, 14 Dec 1998 03:10:16 -0800 From: Mike Smith <mike@smith.net.au> To: Mark Templeton <druid@atc.dera.gov.uk> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: Memory holes for ISA device drivers Message-ID: <199812141110.DAA00438@dingo.cdrom.com> In-Reply-To: Your message of "Wed, 09 Dec 1998 10:43:29 GMT." <366E5451.D95C8C6D@atc.dera.gov.uk>
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> OS is 2.2.5 > Card is on ISA bus, preferably at 0xA00000. > > How do I create a (physical) memory hole for a card, > as the card holds 64k shared memory? > The target system BIOS does not support the 15-16M memory hole. > pmap_mapdev() maps physical to virtual memory, but does not > create a hole. > > How do I create a memory hole? This is chipset- and motherboard-specific. If you can't map the card into the ISA 'hole' at 0xa0000, then you're SOL short of building a custom PCI:ISA bridge (eg. using a PLX9050) and remapping it into PCI space. -- \\ Sometimes you're ahead, \\ Mike Smith \\ sometimes you're behind. \\ mike@smith.net.au \\ The race is long, and in the \\ msmith@freebsd.org \\ end it's only with yourself. \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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