Unfortunately my living situation at the moment is sporadic. So I end up
having to do things piecemeal from several different computers.
I tried that which was suggested below with some degree of success. QEMU
produces spkmodem tones, which I recorded and emailed to myself; in the
hope of being able to continue the work once I got home. Unfortunately
once I got there, I discovered that the recording was an eclectic mix of
spkmodem tones, family disputes, and the best of Australian Crawl. All
conveniently loop mixed into the file I was trying to interpret.
So I set out to repeat the experiment on my local computer. Only to find
that the current master branch of Coreboot fails to build the tool
chain. I was following the tutorial to the letter, but received the
following:
[redacted]/src/coreboot/util/genbuild_h/genbuild_h.sh: 59: -v: not found
The tool-chain then failed to build IASL:
Building IASL v20210331 for host ... failed. Check 'build-IASL/build.log'.
make[1]: *** [Makefile:23: build_iasl] Error 1
make: *** [util/crossgcc/Makefile.inc:30: crossgcc-i386] Error 2
I checked the log, which states:
cp: cannot stat 'iasl': No such file or directory
On 8/12/21 7:11 am, Martin Roth via coreboot wrote:
I spoke with Phcoder (the original author) about this ages ago, and he
recommended not actually playing sound with it, but using it with an audio
cable between the output device and input device. I assume you'd be able to
use it at a much higher speed that way.
Martin
Dec 7, 2021, 10:37 by nic.c3...@gmail.com:
On Tue, Dec 7, 2021 at 10:00 AM Peter Stuge <pe...@stuge.se> wrote:
What if you build coreboot for emulation/qemu with spkmodem console? Does
QEMU produce actual sound? I don't know whether QEMU has a speaker output.
To add to this, QEMU will produce tones with the spkmodem console if
you add "-soundhw pcspk" to your qemu command line. I have tried it,
but spkmodem-recv was unable to decode the signal. I do recall being
able to get it working once on actual hardware by modifying the timing
in spkmodem.c such that the baud rate was some ridiculously low number
like 10 baud, and then messing with the #defines in spkmodem-recv, but
I don't remember what I set those defines to.
Nicholas
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