Comment 3 for bug 1949939

Image used: 20211202.2
SKU: AAEON UPN-EHL01
CID: 202109-29496

I connected the UART adapter (COM port) to the CN62 connector (see user manual[1]), then followed the steps from the description, and get the same error:

[ 2.670839] dw-apb-uart.7: ttyS4 at MMIO 0x600111e000 (irq = 33, base_baud = 114825) is a 16550A
[ 2.698850] dw-apb-uart.8: ttyS5 at MMIO 0x600111c000 (irq = 16, base_baud = 114825) is a 16550A
[ 2.711395] serial serial0: tty port ttyS5 registered
(...)
[ 2.731002] dw-apb-uart.9: ttyS6 at MMIO 0x600111b000 (irq = 17, base_baud = 114825) is a 16550A

and ttyS5 is absent:

$ ls /dev/ttyS*
/dev/ttyS0 /dev/ttyS10 /dev/ttyS12 /dev/ttyS14 /dev/ttyS16 /dev/ttyS18 /dev/ttyS2 /dev/ttyS21 /dev/ttyS23 /dev/ttyS25 /dev/ttyS27 /dev/ttyS29 /dev/ttyS30 /dev/ttyS4 /dev/ttyS7 /dev/ttyS9
/dev/ttyS1 /dev/ttyS11 /dev/ttyS13 /dev/ttyS15 /dev/ttyS17 /dev/ttyS19 /dev/ttyS20 /dev/ttyS22 /dev/ttyS24 /dev/ttyS26 /dev/ttyS28 /dev/ttyS3 /dev/ttyS31 /dev/ttyS6 /dev/ttyS8

[1] https://downloads.up-community.org/download/up-squared-6000-user-manual/