Re: [PATCH v2 3/5] MdeModulePkg/BootManagerUiLib: show inactive boot options

Gao, Zhichao

-----Original Message-----
From: Ard Biesheuvel <ard.biesheuvel@...>
Sent: Tuesday, June 2, 2020 5:27 PM
To: Gao, Zhichao <zhichao.gao@...>;
Cc: jon@...; Laszlo Ersek <lersek@...>; Leif Lindholm
<leif@...>; Ni, Ray <>
Subject: Re: [PATCH v2 3/5] MdeModulePkg/BootManagerUiLib: show
inactive boot options

On 6/2/20 11:11 AM, Gao, Zhichao wrote:
Hi Ard,

Form the Uefi spec:
If a load option is marked as LOAD_OPTION_ACTIVE, the boot manager
will attempt to boot automatically using the device path information
in the load option. This provides an easy way to disable or enable load
options without needing to delete and re-add them.
The ACTIVE flag seems to enable/disable the option.
Sure. But this change does not affect what gets booted automatically, it
changes what gets presented as available options in the UiApp boot manager

To hide options from this menu, a different flag HIDDEN is provided. The UEFI
spec clearly mentions that
- the ACTIVE flag defines which boot options may be booted *automatically*
- the HIDDEN flag defines which boot options are hidden from the menu
which allows options to be booted *manually*

So preventing ACTIVE options from being booted manually is incorrect.
That is what the patch fixes.
I don't see the boot function prevent no-ACTIVE option to boot. So I agree with your point.

Boot#### load options with LOAD_OPTION_CATEGORY set to
LOAD_OPTION_CATEGORY_APP are executables which are not part of the
normal boot processing but can be optionally chosen for execution if
boot menu is provided, or via Hot Keys. See Section 3.1.6 for details '''
There is another flag to implement your function. The option with ACTIVE |
CATEGORY | CATEGORY_APP should show in the boot menu but not in the
normal boot flow.
But this prevents me from setting BootNext to the Shell option, and boot it
automatically on the next boot, right?
Sorry, I miss the requirement of next boot. Next boot would called by EfiBootManagerBoot.
And the APP flag only affect BmSetMemoryTypeInformationVariable result. I don't think it would affect the next boot running.

Anyway, I agree with your patch and thanks for your explain.

Reviewed-by: Zhichao Gao <zhichao.gao@...>


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