From mboxrd@z Thu Jan 1 00:00:00 1970 Subject: Re: Why ack interrupt before calling handler? From: Kenneth Johansson To: Kent Borg Cc: "linuxppc-embedded@lists.linuxppc.org" In-Reply-To: <20030611083953.A26856@borg.org> References: <20030606142939.B15725@borg.org> <1055327622.26152.70.camel@spawn> <20030611083953.A26856@borg.org> Content-Type: text/plain; charset=ISO-8859-1 Date: 11 Jun 2003 14:58:32 +0200 Message-Id: <1055336312.26152.104.camel@spawn> Mime-Version: 1.0 Sender: owner-linuxppc-embedded@lists.linuxppc.org List-Id: On Wed, 2003-06-11 at 14:39, Kent Borg wrote: > On Wed, Jun 11, 2003 at 12:33:42PM +0200, Kenneth Johansson wrote: > Finally the interrupt end gets called, which acks and enables the > interrupt. This ack actually does something for me. > Hopefully this ack only happens if the interrupt is level triggered otherwise you have a problem. > I am thinking that the general purpose PPC code does the early > ack for edge-triggered circumstances. For latched level-triggered > cases there is no harm in the extra early ack. Thats right. -- Kenneth Johansson Ericsson AB Tel: +46 8 719 70 20 Tellusborgsvägen 90 Fax: +46 8 719 29 45 126 25 Stockholm ken@switchboard.ericsson.se ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/