Date: Sat, 21 Dec 2002 08:17:53 +1100 (EST) From: Bruce Evans <bde@zeta.org.au> To: Scott Long <scott_long@btc.adaptec.com> Cc: Sean Kelly <smkelly@zombie.org>, Nate Lawson <nate@root.org>, <current@FreeBSD.ORG> Subject: Re: `cat /dev/io` leads to system lockup. Message-ID: <20021221081335.P2641-100000@gamplex.bde.org> In-Reply-To: <3E02F56C.7080002@btc.adaptec.com>
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On Fri, 20 Dec 2002, Scott Long wrote: > Many peripheral hardware device do not like having their registers > blindly read (it's quite common for a read operation on a register to > signal an ASIC that it's ok to do a certain action) and will respond > with nasty things like interrupt storms, endless PCI target aborts, etc. > Whether this is silly or not is not the point; this is just one of the > many places in Unix that have no seatbelts and assume that the superuser > knows what he is doing. This is irrelevant, since "cat /dev/io" doesn't access device registers. Bruce To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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