1ttyS(4) Kernel Interfaces Manual ttyS(4)
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6 ttyS - serial terminal lines
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9 ttyS[0-3] are character devices for the serial terminal lines.
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11 They are typically created by:
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13 mknod -m 660 /dev/ttyS0 c 4 64 # base address 0x3f8
14 mknod -m 660 /dev/ttyS1 c 4 65 # base address 0x2f8
15 mknod -m 660 /dev/ttyS2 c 4 66 # base address 0x3e8
16 mknod -m 660 /dev/ttyS3 c 4 67 # base address 0x2e8
17 chown root:tty /dev/ttyS[0-3]
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20 /dev/ttyS[0-3]
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23 chown(1), mknod(1), tty(4), agetty(8), mingetty(8), setserial(8)
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27Linux man-pages 6.04 2022-10-30 ttyS(4)