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

[Laszlo Ersek <lersek@redhat.com>]

On 11/30/18 10:13, Udit Kumar wrote:
> 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.

Are you using the latest edk2?

I vaguely recall some refactoring around PL011 (and in general, serial) attributes from a year (or more?) ago. Hmm....

b462f25a21e1 MdeModulePkg/SerialDxe: Describe correctly EFI_DEVICE_ERROR for SetAttributes
13d378fc82d4 MdeModulePkg/SerialDxe: Fix return valued in SerialSetAttributes
7ce5af40c98b MdeModulePkg/SerialDxe: Do not fail reset when SetAttributes is not supported

and

91cc526b15ff MdeModulePkg/SerialDxe: Fix not able to change serial attributes

Thanks
Laszlo

>> -----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