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AM4378: ttys6-9 stands for what?

Tony Tang
Mastermind 26801 points
Part Number: AM4378

AM4378 has only 6 hardware UART, but under Linux dev has ttyS0-ttyS9, and ttyS6-9 can't be used, otherwise will result in hang.

What is the ttyS6-9 stands for?

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    TI__Guru*** 140946 points

    Tony,

    /dev/ttyS0~9 are pre-allocated device node by the serial driver, some of them may not associate to a real UART port, which is defined by the device tree. To know which /dev/ttyS<x> node can be used, you can check the procfs:

    # cat /proc/tty/driver/serial