94ea6109fb
This change adds support for a UBS<->RS232 adapter based on CH340 (or an analogue) that I own. The device seems to have a newer internal version (0x30) and the existing code incorrectly configures line control for it resulting in garbled transmission. The changes are based on what I learned in Linux drivers for the same hardware. Additional changes: - use UCHCOM_REG_LCR1 / UCHCOM_REG_LCR2 instead of explicit 0x18 and 0x25 - use NULL instead of 0 where a pointer is expected Reviewed by: hselasky MFC after: 3 weeks Differential Revision: https://reviews.freebsd.org/D15498
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