Post #4411415
2026-08-06 08:44 UTC
Silly idea: has anyone ever made an embedded device that can run HDLC over serial console for initial provisioning or OOB management or something? Like for when you want the ability to do file transfers and more fancy things than you can do with a simple shell, but don't want to burn the area and power/BOM cost of an ethernet phy
Replies (1)
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@ewenmcneill@cloudisland.nz 2026-08-06 10:05
@azonenberg@ioc.exchange a bunch of network equipment will do xmodem over serial as a last ditch recovery mechanism. I’ve not seen anyone do HDLC. For modern embedded devices the most common pattern seems to be a bootloader with USB2, that will do both CDC (ie serial over USB), typically at 1Mbps, *and* USB Mass Storage for firmware upload (eg .uf2). Having hard wired UART serial is increasingly uncommon on devices. Even networking equipment typically encourages USB serial these days.