Date: Fri, 17 Nov 2000 09:30:32 -0800 (PST) From: John Baldwin <jhb@FreeBSD.org> To: Andrew Gallatin <gallatin@cs.duke.edu> Cc: freebsd-alpha@FreeBSD.org, Christian Weisgerber <naddy@mips.inka.de>, Bernd Walter <ticso@cicely8.cicely.de> Subject: Re: PC164 IDE only works (was: SMPng stability) Message-ID: <XFMail.001117093032.jhb@FreeBSD.org> In-Reply-To: <14869.25705.810908.875060@grasshopper.cs.duke.edu>
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On 17-Nov-00 Andrew Gallatin wrote: > > 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 AUGH!!!!!!!! This explains a lot. :( Time to cook up an evil hack it looks like. :( -- John Baldwin <jhb@FreeBSD.org> -- http://www.FreeBSD.org/~jhb/ PGP Key: http://www.baldwin.cx/~john/pgpkey.asc "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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