Getting USB serial to work closer to boot

Zachary Kline zkline at
Sat Sep 16 13:20:44 EDT 2017


I’ve actually noticed that if the module loads too early, the probe seems to fail. I presume this is because /dev/ttyUSB0 isn’t actually created yet. If I manually mod probe speakup_dectlk after system boot, it works as I’d expect.

This is a bit frustrating, but I don’t know how much can be done about it. Modifying the ignitrd didn’t seem to work as I expected.
> On Sep 16, 2017, at 1:19 AM, Samuel Thibault <samuel.thibault at> wrote:
> Hello,
> Zachary Kline, on ven. 15 sept. 2017 18:38:16 -0700, wrote:
>> I’m wondering what ideas people might have to get the USB serial devices to work closer to boot time? Could I possibly use the initial ram disk to load the appropriate modules?
> That should just work, yes.
> I don't remember how to tell initrd to load a specific module, but I
> guess the documentation knows.
> Samuel
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