Created attachment 237234 [details] dmesg.boot I have an industrial control computer, which uses 16950 chips. This chip is used for the serial port of the computer. I installed FreeBSD version 13.1. When the computer starts, the information detected in the dmesg is as follows: -------------------- Split line ------------- uart1: <16950 or compatible> at port 0x2f8 irq 3 on isa0 uart1: non-PNP ISA device will be removed from GENERIC in FreeBSD 14. -------------------- Split line ------------- This is the configuration content of /etc/ttys: -------------------- Split line ------------- console none unknown off insecure ttyv0 "/usr/libexec/getty Pc" xterm onifexists secure ttyv1 "/usr/libexec/getty Pc" xterm onifexists secure ttyu1 "/usr/libexec/getty std.115200" vt100 on secure -------------------- Split line ------------- This is the configuration content of/boot/loader.conf: -------------------- Split line ------------- beastie_disable=YES boot_multicons=YES comconsole_speed=115200 console=comconsole -------------------- Split line ------------- Kernel Parameters： -------------------- Split line ------------- [root@myhost ~]# sysctl kern.console kern.console: ttyv0,/ttyv0, [root@myhost ~]# sysctl kern.console=ttyv0,ttyu1 kern.console: ttyv0,/ttyv0, sysctl: kern.console=ttyv0,ttyu1: Device not configured [root@myhost ~]# sysctl -a|grep uart uart1: <16950 or compatible> at port 0x2f8 irq 3 on isa0 uart1: non-PNP ISA device will be removed from GENERIC in FreeBSD 14. uart1: <16950 or compatible> at port 0x2f8 irq 3 on isa0 uart1: non-PNP ISA device will be removed from GENERIC in FreeBSD 14. device uart_ns8250 device uart debug.uart_force_poll: 0 debug.uart_poll_freq: 50 irq3: uart1:5 @cpu0(domain0): 3 dev.uart.1.rx_overruns: 0 dev.uart.1.pps_mode: 2 dev.uart.1.%parent: isa0 dev.uart.1.%pnpinfo: dev.uart.1.%location: dev.uart.1.%driver: uart dev.uart.1.%desc: 16950 or compatible dev.uart.%parent: -------------------- Split line ------------- Fault phenomenon: My laptop(MacOS) is connected to this machine through the serial port (RS232), and the console cannot be opened, command line: -------------------- Split line ------------- screen -S aio /dev/tty.usbserial-1410 115200 -------------------- Split line -------------
I tested 11.4, 12.3 and 14.0 and found this problem.
FreeBSD can drive 16550 chip correctly. I tested normal on 11.4, 12.3 and 13.1.
At least some controllers (Moxa) do work: # dmesg.boot puc0: <Moxa Technologies, Smartio CP-104EL-A/PCIe> port 0x1000-0x103f,0x1040-0x104f mem 0xba000000-0xba000fff irq 27 at device 0.0 on p ci7 uart2: <16950 or compatible> at port 1 on puc0 uart3: <16950 or compatible> at port 2 on puc0 uart4: <16950 or compatible> at port 3 on puc0 uart5: <16950 or compatible> at port 4 on puc0 # sysctl -a | grep uart device uart_ns8250 device uart debug.uart_force_poll: 0 debug.uart_poll_freq: 50 dev.uart.5.rx_overruns: 0 dev.uart.5.pps_mode: 2 dev.uart.5.%parent: puc0 dev.uart.5.%pnpinfo: type=1 dev.uart.5.%location: port=4 dev.uart.5.%driver: uart dev.uart.5.%desc: 16950 or compatible dev.uart.4.rx_overruns: 0 dev.uart.4.pps_mode: 2 dev.uart.4.%parent: puc0 dev.uart.4.%pnpinfo: type=1 dev.uart.4.%location: port=3 dev.uart.4.%driver: uart dev.uart.4.%desc: 16950 or compatible dev.uart.3.rx_overruns: 0 dev.uart.3.pps_mode: 2 dev.uart.3.%parent: puc0 dev.uart.3.%pnpinfo: type=1 dev.uart.3.%location: port=2 dev.uart.3.%driver: uart dev.uart.3.%desc: 16950 or compatible dev.uart.2.rx_overruns: 0 dev.uart.2.pps_mode: 2 dev.uart.2.%parent: puc0 dev.uart.2.%pnpinfo: type=1 dev.uart.2.%location: port=1 dev.uart.2.%driver: uart dev.uart.2.%desc: 16950 or compatible dev.uart.%parent: It has all the corresponding /dev/ttyu* and /dev/ttyv* nodes. But requires MSI interrupts workaround to actually pass data over serial line: 'hw.puc.msi_disable=1' to loader.conf See bug #235016, comment #3
In 14.0-RELEASE it still works well, but new message appeared: "ns8250: UART FCR is broken". What does it mean? # dmesg.boot puc0: <Moxa Technologies, Smartio CP-104EL-A/PCIe> port 0x1000-0x103f,0x1040-0x104f mem 0xba000000-0xba000fff irq 27 at device 0.0 on p ci7 ns8250: UART FCR is broken ns8250: UART FCR is broken uart2: <16950 or compatible> at port 1 on puc0 ns8250: UART FCR is broken ns8250: UART FCR is broken uart3: <16950 or compatible> at port 2 on puc0 ns8250: UART FCR is broken ns8250: UART FCR is broken uart4: <16950 or compatible> at port 3 on puc0 ns8250: UART FCR is broken ns8250: UART FCR is broken uart5: <16950 or compatible> at port 4 on puc0