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- Path: sparky!uunet!wupost!usc!sol.ctr.columbia.edu!ira.uka.de!math.fu-berlin.de!unidui!du9ds3!veit
- From: veit@du9ds3.uni-duisburg.de (Holger Veit)
- Newsgroups: comp.unix.bsd
- Subject: Re: HP Vectra and 386BSD, hope it's not a FAQ
- Date: 15 Sep 92 16:45:29 GMT
- Organization: Uni-Duisburg FB9 Datenverarbeitung
- Lines: 45
- Message-ID: <veit.716575529@du9ds3>
- References: <u4901ac.716556561@sun7>
- Reply-To: veit@du9ds3.uni-duisburg.de
- NNTP-Posting-Host: du9ds3.uni-duisburg.de
- Keywords: HP Vectra
-
- In <u4901ac.716556561@sun7> u4901ac@sun7.LRZ-Muenchen.DE () writes:
-
- >Hi,
- >I tried to boot the tiny boot diskette on a HP Vectra 386/25 with 170 MB disk
- >space. But the PC always reboots a few seconds after displaying the rom bios
- >copyright. I've read bsd.faq very carefully and read nearly everything related
- >in this newsgroup -- nothing seems to help me. I think it a problem of the 4
- >extra k that this machine uses for the rom bios. I tried the instructions
- >recommended in bsd.faq but they are for an american setup program - I have
- >a german one.
-
- >Has anyone an idea to get rid of these 4 k ?
-
-
- >-----------------------------------------------------------------------------
- >Henning Brockfeld u4901ac@sun7.lrz-muenchen.de
- >Institute for economic geography
- >University of Munich
- >-----------------------------------------------------------------------------
-
- I don't think that the 4k BIOS space will influence operation, because from
- the moment the secondary bootloader is loaded the system is "flying" without
- any BIOS support. So thether or not the data area is overwritten or
- reserved for other things, is irrelevant then (unless is it mapped out of
- the normal world by some chipset on the motherboard - then it is away).
-
- I suspect that many problems relate to special, incompatible handling of
- essential facilities, here in particular the Gate A20 code. There are a couple
- of different ways to enable this address bit, the keyboard controller method
- used by IBM (and "compatibles") is just one. When I disassembled some version
- of HIMEM.SYS long ago (just to find out what is does, no documentation on
- XMS was available that time), I was really shocked to find undocumented
- instructions (LOADALL'286) and about a dozen of different methods to
- detect special hardware and then switch this simple A20 bit on and off.
-
- I think, some sort of Compaq and the HP Vectra was among those incompatible
- systems, but I am not quite sure.
-
- Holger
-
- --
- | | / Dr. Holger Veit | INTERNET: veit@du9ds3.uni-duisburg.de
- |__| / University of Duisburg | BITNET: veit%du9ds3.uni-duisburg.de@UNIDO
- | | / Dept. of Electr. Eng. | "No, my programs are not BUGGY, these are
- | |/ Inst. f. Dataprocessing | just unexpected FEATURES"
-