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

[Udit Kumar <udit.kumar@nxp.com>]

Thanks Laszlo/Andrew
Finally I manage to get logs from user-space,  problem  was fifo of PL011 uart was not getting enable in case of direct boot.
But in case of boot via UiApp, some piece of code was setting serial port attribute to enable this ( I still to figure out from where). 
OS rely on boot-loader to enable this bit.
 
Regards
Udit

> -----Original Message-----
> From: Laszlo Ersek <lersek@redhat.com>
> Sent: Thursday, November 29, 2018 11:31 PM
> To: Udit Kumar <udit.kumar@nxp.com>; afish@apple.com
> Cc: Ni, Ruiyu <ruiyu.ni@intel.com>; edk2-devel@lists.01.org; Zeng, Star
> <star.zeng@intel.com>
> Subject: Re: [edk2] Help on boot manager 'Boot Manager Menu' and direct boot
> 
> 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