Date: Sat, 11 May 2002 21:48:55 +0200 From: Joerg Wunsch <j@uriah.heep.sax.de> To: "M. Warner Losh" <imp@village.org> Cc: brian@Awfulhak.org, cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/isa fd.c fdreg.h Message-ID: <20020511214855.G91528@uriah.heep.sax.de> In-Reply-To: <20020511.111210.41215654.imp@village.org>; from imp@village.org on Sat, May 11, 2002 at 11:12:10AM -0600 References: <joerg@FreeBSD.org> <200205110015.g4B0F8nA006576@hak.lan.Awfulhak.org> <20020511082352.E91528@uriah.heep.sax.de> <20020511.111210.41215654.imp@village.org>
next in thread | previous in thread | raw e-mail | index | archive | help
As M. Warner Losh wrote: > : (The man page for DELAY(9) doesn't mention any restriction > : either.) > > DELAY is always safe to use. That was my impression now, too. > However, it is highly undesireable to > use it for large values if !cold. The value is 1. :) There's an outer spin loop around the DELAY(1) that waits for a certain bit pattern in the FDC main status register to appear. Normally, the bit pattern should appear within a few microseconds at most. This is as undesirable as any PIO data transfer, but unavoidable for the archaic underlying floppy controller hardware. -- cheers, J"org .-.-. --... ...-- -.. . DL8DTL http://www.sax.de/~joerg/ NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20020511214855.G91528>