[Top] [All Lists]  Re: the cause of spurious interrupt problem
To: Zhang Fuxin <> Subject: Re: the cause of spurious interrupt
problem From: Dominic Sweetman <> Date: Mon, 10 Dec 2001
17:59:40 +0000 (GMT) Cc: Chris Dearman <>, "" <> In-reply-to: <>
References: <> Zhang Fuxin ( writes:  >   Then all at a suddenly
i find the REAL reason...  I don't know whether you read the
section "Tips on Programming South Bridge Interrupt Controllers"
in our P-6032 user manual.  It goes like this:
*           *           *           *  The interrupt controllers
inside the south bridge chip have to be software-compatible with
the dual Intel 8259 controllers fitted to very old PCs.  There
are two 8-bit controllers inside the south bridge, a slave whose
interrupt output becomes one of the eight inputs of the master
controller.  The 8259 is a very old device, dating from around
1980.  Under the influence of contemporary minicomputer designs,
the 8259 made a brave attempt to build an interrupt priority
system in