Date: Sun, 12 Dec 2004 22:36:31 +1030 From: "Daniel O'Connor" <doconnor@gsoft.com.au> To: freebsd-current@freebsd.org Cc: "Wilkinson, Alex" <alex.wilkinson@dsto.defence.gov.au> Subject: Re: Setting up a "Parallel Console" ? Message-ID: <200412122236.53460.doconnor@gsoft.com.au> In-Reply-To: <20041212113624.GA26887@squash.dsto.defence.gov.au> References: <200412112320.04019.doconnor@gsoft.com.au> <20041212113624.GA26887@squash.dsto.defence.gov.au>
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[-- Attachment #1 --] On Sun, 12 Dec 2004 22:06, Wilkinson, Alex wrote: > How about a USB serial adapter as such: > http://www.keyspan.com/products/usb/USA19HS/ They won't work during a crash because the USB stack stops working. The reason RS232 ports were chosen is simplicity of programming, so when the system goes pear shaped you can still expect your small serial stub to work. USB is the crazy huge edifice of crap^Wcode so it's much less likely to be unhosed in a crash. Firewire is good because the hardware can do DMA to read local memory without any intervention from the crashed machine, even though the rest of the code is more complex than RS232. Parallel would be pretty simple too because it's a quite basic interface. -- Daniel O'Connor software and network engineer for Genesis Software - http://www.gsoft.com.au "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.6 (FreeBSD) iD8DBQBBvDRd5ZPcIHs/zowRAr6WAJ4lj2bTomS8hqXgLfZ6lzRLbpVTmgCffTVy PK4TkyA74YlJ8E6PcuCZiFI= =2PYf -----END PGP SIGNATURE-----help
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