Serial connection fails about legacycura HOT 5 CLOSED

Looks like your kernel/USB-Serial driver doesn't seem to accept 250000 baud, which is kind of a none-standard baudrate.
Maybe you have an older kernel?

Anyhow, if you just want it to work, build a custom firmware with http://daid.mine.nu/~daid/marlin_build/ with a baudrate that works. Download the hex file, and use the advanced menu "Install custom firmware" to install it.

I've also pushed a change that hopefully caches this error, and handles it a bit more gracefully.

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Yes, that, or the hardware doesn't like it. I'm using the latest Ubuntu, so the latter seems more propable. I did build myself a marlin with a baudrate of 115200, and it seems to work. Now, the appropriate thing to do is the enable SkeinPypy to use different baudrates (115200 seems widely used/supported) in the wizard.

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Also, are the build-me-marlin defaults the same as what comes with SkeinPypy, and are they optimal? At least the M109 wait time should be less than 30 seconds.

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A baudrate of 250000 yields less communication errors for some reason (no idea why, but people have tested it)
It also gives more bandwidth to play with, which is important on high detailed prints. So you don't get buffer underruns.

The latest github version uses the baudrate configured in the preferences for the wizard. It's a bit sub-optimal that you have to close down the wizard, change the baudrate, and re-run the wizard. But 80-90% of the users will never encounter this problem.

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The 12.07 release installs a 115200 baudrate firmware by default if you run linux. There is also the auto-baudrate detection and some extra exception handling in the code so this problem is handled more gracefully.

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