Date: Thu, 18 Jan 1996 23:57:40 +0100 (MET) From: J Wunsch <j@uriah.heep.sax.de> To: dutchman@spase.nl (Kees Jan Koster) Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: Above286 board Message-ID: <199601182257.XAA29440@uriah.heep.sax.de> In-Reply-To: <199601181416.OAA01326@phobos.spase.nl> from "Kees Jan Koster" at Jan 18, 96 02:16:06 pm
next in thread | previous in thread | raw e-mail | index | archive | help
As Kees Jan Koster wrote: [EMM board] > I'd like to use it as a ram disk for FreeBSD, to have 2MB of fast swap > space. But for that I'll have to write a device driver. > > 1) Has anyone heard of this board? Does anyone use it? Is there > source of a device driver for it? (Any system) EMM should be fairly well documented. It's being addressed in segments, where the active segment is being mapped at some address in the ``ISA hole''. > 2) Can a non-kernel process address the ISA memory space? To > experiment I'd like to be able to write to it's addresses without > rebuilding the kernel. It could, via /dev/[k]mem. An alternative is writing a kernel driver, and hooking it into the kernel as an lkm. See /usr/share/examples/lkm. > The docs tell me that the board can be used to supply _conventional_ > memory via a setup program. That's odd. I didn't think an XT could > address memory via the ISA bus? Or can it? It can, in the ISA hole (0xa0000 ... 0xfffff), though fairly slow. -- 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. ;-)
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199601182257.XAA29440>