Re: unable to get virtual serial console for EFI

What does the ComOut variable say?

Warner


On Mon, May 23, 2022 at 3:57 AM Souradeep Chakrabarti <
schakrabarti@microsoft.com> wrote:

> Hi,
>
> I am trying to get the virtual serial console to access via putty while
> booting FreeBSD 13 arm64 bootonly on Hyper-V.
>
>
>
> Setting console="efi" is not helping to have the virtual serial console
> access using putty for ARM64. It is before any kernel module loaded.
>
> I can get the loader output in vmconnect.exe but not in the putty.
>
>
>
> Though I can see VM is getting connected to Hyper-V virtual COM1 console.
> But no output is coming to putty.
>
>
>
> I have following question :
>
> Any specific support from EFI firmware, is required for virtual serial to
> work in EFI loader in this phase of loading?
>
>
>
> I can see FreeBSD EFI loader is able to read the ConInDev and ConOutDev
> variables.
>
>
>
> With set console="efi" or set console="comconsole,efi"  or set
> console="efi" , nothing in getting redirected in putty in arm64.
>
> But in X86 that is not the problem.
>
>
>
> Without this debugging the bring up of FreeBSD on arm64 Hyper-V is quite
> difficult. Any help or pointers are really appreciated.
>
>
>
> Regards,
>
> Souradeep
>
>
>