Re: Can't enable uart for Ubuntu SOS

Geoffroy Van Cutsem

Hi Zhangshuai,

What is your version of Ubuntu? I'm running Ubuntu 20.04 on a machine and did not have to update Grub to install ACRN.

This is the right location, do you see the Grub menu at all after updating the Grub binary? If not, can you get to the EFI shell and manually start it from there? Make sure you have secure boot turned off in your bios as well.

Back to your question about the UART, can you also try to use the bdf info instead, i.e.:
# lspci | grep UART
00:18.0 . Series HSUART Controller #1 (rev 0b)
00:18.1 . Series HSUART Controller #2 (rev 0b)

Which translates into uart=bdf@00:18.1 (if you want to use the second one for example).

One last thing, make sure you have flow control (HW and SW) turned off in your serial port program (e.g. minicom).


-----Original Message-----
From: acrn-users@... <acrn-users@...>
On Behalf Of "??????-?????-??
Sent: Thursday, February 4, 2021 10:27 AM
To: acrn-users@...
Cc: ligang@...; wumengkui@...; lijia@...;
hujunke@...; hudongjiang@...
Subject: Re: [acrn-users] Can't enable uart for Ubuntu SOS

Hi Victor,
        update the grub2.05 according to this
copy the grubx64.efi to /boot/efi/EFI/ubuntu . But grub cannot boot ubuntu
to startup. Is the file in the wrong place?

Thanks and Best Regards,


Xi'an R&D Center Computerized Numerical Control R&D Dept. Shuai Zhang
Tel : 029-84503040-8360
E-mail :zhangshuai@... Web

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