From owner-freebsd-alpha Fri Jan 7 13:29:34 2000 Delivered-To: freebsd-alpha@freebsd.org Received: from rover.village.org (rover.village.org [204.144.255.49]) by hub.freebsd.org (Postfix) with ESMTP id 2394B157FA for ; Fri, 7 Jan 2000 13:29:27 -0800 (PST) (envelope-from imp@harmony.village.org) Received: from harmony.village.org (harmony.village.org [10.0.0.6]) by rover.village.org (8.9.3/8.9.3) with ESMTP id OAA18089; Fri, 7 Jan 2000 14:29:20 -0700 (MST) (envelope-from imp@harmony.village.org) Received: from harmony.village.org (localhost.village.org [127.0.0.1]) by harmony.village.org (8.9.3/8.8.3) with ESMTP id OAA88896; Fri, 7 Jan 2000 14:29:20 -0700 (MST) Message-Id: <200001072129.OAA88896@harmony.village.org> To: De la Cruz Lugo Eric Subject: Re: HARDWARE.TXT specific for Alpha? Cc: freebsd-alpha@FreeBSD.ORG In-reply-to: Your message of "Fri, 07 Jan 2000 09:32:58 CST." References: Date: Fri, 07 Jan 2000 14:29:20 -0700 From: Warner Losh Sender: owner-freebsd-alpha@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org In message De la Cruz Lugo Eric writes: : Thanks for the info, in X86 Architecture the RAM max size is 4 GB (check : ftp.cdrom configuration :), i thinked that in Alpha should be bigger. No. That's not right. PPro and newer support 36 bits of physical address, which leads to a max size of 64G. The biggest Mobo I've seen for x86 is 8GB (and that was second hand info about a micron server mobo). FreeBSD can't go above 4G w/o rewriting all DMA customers to use bus_dma, which are the network drivers iirc. The pmap layer would also require a fair amount of work as well. But I drift from the charter of this group now :-) Warner To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message