uart_16550 is used at run time in 10 crates.

Depender (with downloads and own rev deps) uart_16550 version
370 libertyos_kernel ^0.2.0
bottleos ^0.2.0
cobalt_os ^0.2.15
com_logger ^0.2
moros ^0.2.15
pluggable_interrupt_os ^0.2.0
qemu_print ^0.2.15
rustos ^0.2
x86_serial_logger ^0.2.15
x86_testbench ^0.2.15