From owner-freebsd-questions Fri Jan 20 07:04:55 1995 Return-Path: questions-owner Received: (from root@localhost) by freefall.cdrom.com (8.6.9/8.6.6) id HAA11576 for questions-outgoing; Fri, 20 Jan 1995 07:04:55 -0800 Received: from copper.cmp.com (copper.cmp.com [198.80.26.247]) by freefall.cdrom.com (8.6.9/8.6.6) with SMTP id HAA11565 for ; Fri, 20 Jan 1995 07:04:47 -0800 Received: from [198.80.26.5] by copper.cmp.com with SMTP (1.38.193.5/16.2) id AA10179; Fri, 20 Jan 1995 10:04:47 -0500 Received: by mailgate.cmp.com with Microsoft Mail id <2F1FFB10@mailgate.cmp.com>; Fri, 20 Jan 95 10:04:00 PST From: Plyaskin Sergey To: "'freebsd-questions@freebsd.org'" Subject: Extra RAM? Date: Fri, 20 Jan 95 10:03:00 PST Message-Id: <2F1FFB10@mailgate.cmp.com> Encoding: 32 TEXT X-Mailer: Microsoft Mail V3.0 Sender: questions-owner@FreeBSD.org Precedence: bulk Hi everybody, My question isn't really pure BSD question, but since I'm installing FreeBSD 2.0 on my machine, it is somehow related to FreeBSD :-) I'm installing FreeBSD 2.0-950112-SNAP on an Mitac 486DX33 w/ EISA bus and Phoenix 1.0 BIOS. CMOS reports 640k of base memory, 15MB of extended, and 20MB of extra RAM (in total 36MB). The Microsoft Diagnostics (msd) under DOS detects only 15 MB (I think 1MB is relocated via BIOS). Windows NT installations detects all 35 MB. FreeBSD only sees 15 MB. I believe I've read somewhere that the amount of handled RAM depends on which disk controller I use (ISA, or Local Bus). In case of ISA, it is impossible to address more than 16MB because of DMA limitations. However, in the FAQ for 2.0 I read: 1.5: I have 32MB of memory, should I expect any special problems? No. FreeBSD 2.0 comes with bounce buffers which allows your bus mastering controller access to greater than 16MB. So, I have 3 questions: 1. Please someone explain what is *extra* RAM means. Is that expanded memory or somethinfg else? 2. Right now, I temporarily use AHA 1542CF SCSI host adapter (ISA) but I still have a hope to be able to use my EISA AHA 1740. Does it matter? 3. Anyway, how to make FreeBSD to see this extra memory? Thanks in advance. __________________________________________________________ Serge Plyaskin, CMP Publications splyaski@cmp.com