From owner-freebsd-hackers Thu Jul 8 4:20:10 1999 Delivered-To: freebsd-hackers@freebsd.org Received: from rina.naklab.dnj.ynu.ac.jp (rina.naklab.dnj.ynu.ac.jp [133.34.17.16]) by hub.freebsd.org (Postfix) with ESMTP id E5CEE14D1C; Thu, 8 Jul 1999 04:20:06 -0700 (PDT) (envelope-from tanimura@naklab.dnj.ynu.ac.jp) Received: from rina.naklab.dnj.ynu.ac.jp (localhost [127.0.0.1]) by rina.naklab.dnj.ynu.ac.jp (8.9.1a/3.7W-Naklab-2.1-19981120) with ESMTP id UAA28709; Thu, 8 Jul 1999 20:19:18 +0900 (JST) Message-Id: <199907081119.UAA28709@rina.naklab.dnj.ynu.ac.jp> To: dfr@nlsystems.com Cc: julian@whistle.com, freebsd-hackers@freebsd.org, freebsd-current@freebsd.org Cc: Seigo Tanimura Subject: Re: Rewriting pca(4) using finetimer(9) (was: Re: MPU401 now worksunderNew Midi Driver Framework with a Fine Timer) From: Seigo Tanimura In-Reply-To: Your message of "Thu, 8 Jul 1999 11:00:24 +0100 (BST)" References: X-Mailer: Mew version 1.70 on Emacs 19.34.1 / Mule 2.3 Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Date: Thu, 08 Jul 1999 20:19:18 +0900 Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Thu, 8 Jul 1999 11:00:24 +0100 (BST), Doug Rabson said: >> There is one problem in this method. acquire_timer0() is only implemented >> for i386. We would need to write something equivalent for alpha... dfr> The timer hardware on the alpha is essentially the same but the interrupts dfr> are wired up differently. I'm not sure how hard it would be to get timer0 dfr> working but I think it should be possible. I see. Then I can work on i386 first, and later on alpha. dfr> The alphas tend to run the main clock quite fast (typically 1024hz) so the dfr> granularity of timing is better but probably not good enough for midi or dfr> pca. I agree. Seigo Tanimura To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message