From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from gate.crashing.org (gate.crashing.org [63.228.1.57]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id E1D9AB70B9 for ; Fri, 25 Nov 2011 07:43:41 +1100 (EST) Message-ID: <1322167404.32635.7.camel@pasglop> Subject: RE: [PATCH 01/16] pmac_zilog: fix unexpected irq From: Benjamin Herrenschmidt To: David Laight Date: Fri, 25 Nov 2011 07:43:24 +1100 In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Mime-Version: 1.0 Cc: linuxppc-dev@lists.ozlabs.org, linux-m68k@vger.kernel.org, Geert Uytterhoeven , linux-serial@vger.kernel.org, Finn Thain List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Thu, 2011-11-24 at 15:28 +0000, David Laight wrote: > > On most 68k Macs the SCC IRQ is an autovector interrupt and cannot be > > masked. This can be a problem when pmac_zilog starts up. > > Wouldn't this also happen if the interrupt were shared? > Hopefully nothing vaguely modern uses the borked Zilog 8530 SCC > (which I presume is the part in question - brings back > too many nightmares....) Yup. Afaik, the most recent you can find with that are PowerMacs which used it for their internal modem (even my G5 has one wired to the internal slot afaik), tho none of those had shared interrupts. Cheers, Ben.