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>
next in thread | previous in thread | raw e-mail | index | archive | help
--nextPart7070556.eiHZVC5MPs Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline 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 th= e=20 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= =20 unhosed in a crash. =46irewire is good because the hardware can do DMA to read local memory wit= hout=20 any intervention from the crashed machine, even though the rest of the code= =20 is more complex than RS232. Parallel would be pretty simple too because it's a quite basic interface. =2D-=20 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 --nextPart7070556.eiHZVC5MPs Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.6 (FreeBSD) iD8DBQBBvDRd5ZPcIHs/zowRAr6WAJ4lj2bTomS8hqXgLfZ6lzRLbpVTmgCffTVy PK4TkyA74YlJ8E6PcuCZiFI= =2PYf -----END PGP SIGNATURE----- --nextPart7070556.eiHZVC5MPs--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200412122236.53460.doconnor>