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My Linux system is built by Buildroot and runs on a Raspberry Pi. I use a Usb to TTL Serial cable to get a console.

Here comes cmdline.txt

dwc_otg.fiq_fix_enable=1 sdhci-bcm2708.sync_after_dma=0 dwc_otg.lpm_enable=0
console=ttyAMA0,115200 kgdboc=ttyAMA0,115200 console=tty1
root=/dev/mmcblk0p2 rootwait

Here comes the getty related part of /etc/inittab

# Put a getty on the serial port
ttyAMA0::respawn:/sbin/getty -L  ttyAMA0 115200 vt100 # GENERIC_SERIAL

Only kernel messages are printed; no daemons ones (such as sshd).

How can this issue be fixed?

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  • Actually, just reordering the 2 entries works too, as the last console element seems to be assigned as the primary logging console by systemd (serial consoles are not just used in SBCs (like the Pi), but a lot in servers in data centres too). That is, console=tty1 before console=ttyAMA0,115200
    – Samveen
    Oct 17, 2020 at 12:43

1 Answer 1

Reset to default
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console is specified twice in that cmdline:

console=ttyAMA0,115200
console=tty1

Perhaps the second one has overridden the first (it can't be both at the same time). If ttyAMA0 is what you want to use, remove console=tty1.

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