Date: Wed, 4 Oct 2000 23:43:16 +0100 (BST) From: Doug Rabson <dfr@nlsystems.com> To: Wilko Bulte <wkb@freebie.demon.nl> Cc: FreeBSD-alpha mailing list <freebsd-alpha@freebsd.org> Subject: Re: max memory on Alpha? Message-ID: <Pine.BSF.4.21.0010042339430.94692-100000@salmon.nlsystems.com> In-Reply-To: <20001003200741.A1318@freebie.demon.nl>
next in thread | previous in thread | raw e-mail | index | archive | help
On Tue, 3 Oct 2000, Wilko Bulte wrote: > What is the currently max supported memory size on Alpha? 2Gb maybe? > Or will 4Gb also be OK? > > Reason for asking is that I want to try a AS8400 who is equipped > with 3x 4Gb memory module. Currently we are limited to 1Gb or 2Gb, depending on the platform. The tsunami driver uses a 2Gb window for dma and I think AS4x00 and AS8x00 also support 2Gb. Supporting more memory requires that all dma capable hardware is the busdma interface in its drivers. Given that, someone needs to write a small amount of code in busdma_machdep.c to either bounce transfers down to the 2Gb range or to use the sgmap to map the transfers into a reachable place. -- Doug Rabson Mail: dfr@nlsystems.com Phone: +44 20 8348 6160 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.BSF.4.21.0010042339430.94692-100000>