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[Bug 1140464] grub: error message "error: serial port `com0' isn't found. error: terminal `serial' isn't found."
  • From: bugzilla_noreply@xxxxxxxxxx
  • Date: Wed, 17 Jul 2019 07:53:53 +0000
  • Message-id: <bug-1140464-21960-FtfHuCiWmR@http.bugzilla.opensuse.org/>
http://bugzilla.opensuse.org/show_bug.cgi?id=1140464
http://bugzilla.opensuse.org/show_bug.cgi?id=1140464#c1

--- Comment #1 from Michael Chang <mchang@xxxxxxxx> ---
The aarch64 has no ns8250 (In reply to Oliver Kurz from comment #0)
## Observation

On the serial terminal (SOL from IPMI) of an aarch64 machine I can see the
following error messages immediately after the message `Welcome to GRUB!`:

```
error: serial port `com0' isn't found.
error: terminal `serial' isn't found.
error: terminal `serial' isn't found.
```

Yes, the aarch64 cpu doesn't have io ports to access ns8250/UART device, that's
why having "com0 isn't found" as "com0" represents first ns8250 device found by
grub and is default device name if omitted in the serial command.

For aarch64, the efi serial input/output protocol is used to configure the
serial device, and syntax could be looking like.

GRUB_SERIAL_COMMAND="serial --unit=0 --speed=115200 --parity=no efi0"

It depends on running UEFI firmware to work, if implemented.

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