On Thu, Aug 30, 2007 at 01:05:32PM +0200, Carl-Daniel Hailfinger wrote: > On 30.08.2007 06:19, ron minnich wrote: > > On 8/29/07, Carl-Daniel Hailfinger <[EMAIL PROTECTED]> wrote: > >> I'd say it should accept a lar archive via serial console, perhaps using > >> ymodem, and start executing the first member of the lar. > >> > >> A bit more detailed: If the BIOS fails to verify its checksum, it > >> outputs a message telling you about it over serial, waits for signature > >> to arrive over serial (a standard char sequence with repetitions at the > >> beginning), reads until it has one complete signature, switches serial > >> to ymodem and accepts a lar archive. The first member of the lar is then > >> executed. > >> > >> The "wait for signature" is there to allow people to use multiple tries > >> getting serial speed right. OTOH, if the code outputs a continuous > >> stream of "TESTTEXT\n" while waiting for serial input, the other side > >> can verify serial speed settings as well. > >> > >> What do you think? > > > > That's the way to go. > > Can we invert the speaker line each time a byte is written out over > serial? With 115200,8,N,1 we would get an inversion frequency of > 11.52kHz and a tone frequency of 5.76kHz. Comparing that tone to some > downloadable audio sample would allow people to find out if serial was > driven with the right speed.
Should be doable. Have a look at arch/x86/speaker.c in v3 for sample code if you want to give it a try. Uwe. -- http://www.hermann-uwe.de | http://www.holsham-traders.de http://www.crazy-hacks.org | http://www.unmaintained-free-software.org
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