Date: Fri, 17 Nov 2000 09:55:11 -0800 (PST) From: Matthew Jacob <mjacob@feral.com> To: Andrew Gallatin <gallatin@cs.duke.edu> Cc: Bernd Walter <ticso@cicely8.cicely.de>, John Baldwin <jhb@FreeBSD.ORG>, Christian Weisgerber <naddy@mips.inka.de>, freebsd-alpha@FreeBSD.ORG Subject: Re: PC164 IDE only works (was: SMPng stability) Message-ID: <Pine.LNX.4.21.0011170955040.11407-100000@zeppo.feral.com> In-Reply-To: <14869.25705.810908.875060@grasshopper.cs.duke.edu>
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"what I said" > > An interesting comment found in the linux kernel sources: > > /* In theory, the PC164 has the same interrupt hardware as > the other Cabriolet based systems. However, something > got screwed up late in the development cycle which broke > the interrupt masking hardware. Repeat, it is not > possible to mask and ack interrupts. At all. > > In an attempt to work around this, while processing > interrupts, we do not allow the IPL to drop below what > it is currently. This prevents the possibility of > recursion. > > ??? Another option might be to force all PCI devices > to use edge triggered rather than level triggered > interrupts. That might be too invasive though. */ > > > Drew > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-alpha" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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