Re: Help on boot manager 'Boot Manager Menu' and direct boot

[Laszlo Ersek <lersek@redhat.com>]

On 11/29/18 14:12, Udit Kumar wrote:
> Thanks Laszlo,
> 
>  
>> I can only think of some terminal control sequences that are *not* printed to
>> the terminal when you don't enter UiApp manually. I don't understand how that
>> could cause the exact symptom you describe, but I have no better explanation.
>>
>> Can you try other serial communication programs on your desktop? Such as
>> "minicom" or "screen"?
> 
> Screen didn't help.
> Moreover , using different OS distributions show same similar behavior !!
>  
>> Also, can you try changing your "console=..." kernel param(s)?
> 
> You meant baud-rate ? 

Yes, and more. The options that the "console=" kernel parameter takes.

> 
> On uefi side,  could you help me if there is some extra information passed to OS in path 
> UiApp -> BootDevice, 

I don't think so. Nothing comes to my mind anyway.

> I could see , some of additional protocols are installed in above path, I am not sure if those are
> used  by  OS or OS Loader (grub in my case)  somehow.

Well, UiApp generally connects all drivers to all devices -- normally a
platform BDS would not want to do this, for the sake of booting quickly
--, which likely results in more protocol instances being installed in
the system. That shouldn't cause a difference for how serial behaves
once the OS has booted.

Thanks
Laszlo