Re: how to create environmental variable for Shell

["Jarlstrom, Laurie" <laurie.jarlstrom@intel.com>]

Hi,
Are you trying to set the Timeout variable (delay to allow user to press a key to go into setup) or the delay for the shell  before executing startup.nsh?
The Timeout variable is a PCD and can be set with: 
     TmpVal = 2;
     PcdStatus = PcdSet16(PcdPlatformBootTimeOut, (UINT16)TmpVal);

This will set the global variable "Timeout" - check with shell dmpstore.

The delay for the Shell can be done when invoking the Shell.efi image with "-nostartup" option.

thanks,
Laurie
 
laurie.jarlstrom@intel.com

Intel SSG/STO/EBP
(503) 712-9395



-----Original Message-----
From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of Jim.Dailey@dell.com
Sent: Friday, November 03, 2017 4:54 AM
To: TigerLiu@zhaoxin.com
Cc: edk2-devel@lists.01.org
Subject: Re: [edk2] how to create environmental variable for Shell

Please excuse the stupid email plug-in I have to use that puts the "Internal Use" line in my text emails. The plug-in does not allow me to see that text, so I have to remember to remove it every time even though I never see it.  Sadly, I sometimes forget.

-----Original Message-----
From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of Dailey, Jim
Sent: Friday, November 3, 2017 6:49 AM
To: TigerLiu@zhaoxin.com
Cc: edk2-devel@lists.01.org
Subject: Re: [edk2] how to create environmental variable for Shell

Dell - Internal Use - Confidential   <=== No, this is *NOT* true!

You need to use the shell's GUID, gShellVariableGuid, if you want to create a shell variable.

Regards,
Jim

-----Original Message-----
From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of Tiger Liu
Sent: Friday, November 3, 2017 12:01 AM
To: edk2-devel@lists.01.org
Subject: [edk2] how to create environmental variable for Shell

Hi, experts:
I have a question about creating shell’s environmental variable.
Such as : StartupDelay

I tried to create this variable at uefi boot phase.
……
              TmpVal = 2;
              Status =  gRT->SetVariable (
                                   L"StartupDelay",
                                   &gEfiGlobalVariableGuid,
                                   EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS |EFI_VARIABLE_NON_VOLATILE,
                                   sizeof (TmpVal),
                                   &TmpVal
              );
……

When boot to shell, it still delays 5 seconds.

I tried to use shell cmd ‘set’, then it’s ok, shell’s default delay switched to 2 seconds.

I used dmpstore cmd to list current system’s variables, and found 2 StartupDelay variables:
Efi:StartupDelay
SEnv:StartupDelay

So, my question is:
How to create “SEnv:StartupDelay” variable in UEFI BIOS code.

Thanks

Best wishes,


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