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device/serial: reopen the port after USB re-enumeration - #36
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A board whose console is USB CDC/ACM drops its serial port on every reset and re-creates it once it boots again. The serial device kept the stale handle, so every read and write after a reboot failed, and start failed when the port did not exist yet. A failed read or write now closes the port and reopens it, and the health check retries until the port is back. Start no longer requires the port to exist; the boot wait reopens it when the device enumerates. Signed-off-by: raiden00pl <raiden00@railab.me> Assisted-by: Claude Code:claude-opus-5-5
raiden00pl
requested review from
acassis,
cederom,
simbit18 and
xiaoxiang781216
October 13, 2026 10:33
xiaoxiang781216
approved these changes
Oct 13, 2026
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A board whose console is USB CDC/ACM drops its serial port on every reset and re-creates it once it boots again. The serial device kept the stale handle, so every read and write after a reboot failed, and start failed when the port did not exist yet.
A failed read or write now closes the port and reopens it, and the health check retries until the port is back. Start no longer requires the port to exist; the boot wait reopens it when the device enumerates.