On Nov 4, 2019, at 9:24 PM, Ashish Singhal <ashishsingha@nvidia.com> wrote:

Hi Ray,

I did not see any example with which one can tell BDS not to enumerate a boot option. Can you please point me to an example where a protocol (Block IO, Simple FS or Load File) does not get enumerated as a boot option?


Ashish,

Are you asking for example code, or reasons that you would not want to enumerate something as bootable? 

Most likely if you want to have a platform policy to add gEdkiiSkipBmAutoEnumerateProtocolGuid you are going to need an EFI Driver Model driver to add it to the handle based on some platform policy. This is the only way you can filter based on things getting connected at different times during boot. 

Thanks,

Andrew Fish


Thanks
Ashish

-----Original Message-----
From: Ni, Ray <ray.ni@intel.com> 
Sent: Monday, November 4, 2019 7:42 PM
To: Laszlo Ersek <lersek@redhat.com>; devel@edk2.groups.io; Ashish Singhal <ashishsingha@nvidia.com>; Wang, Jian J <jian.j.wang@intel.com>; Wu, Hao A <hao.a.wu@intel.com>; Gao, Zhichao <zhichao.gao@intel.com>
Cc: Kinney, Michael D <michael.d.kinney@intel.com>
Subject: RE: [edk2-devel] [PATCH] Support skipping automatic BM enumeration

+ Mike

With the UEFI driver model, if a device is not needed by booting, it can skip the connecting.
Then I do not see a need of the new protocol.

Thanks,
Ray

-----Original Message-----
From: Laszlo Ersek <lersek@redhat.com>
Sent: Thursday, October 31, 2019 6:15 PM
To: devel@edk2.groups.io; ashishsingha@nvidia.com; Wang, Jian J 
<jian.j.wang@intel.com>; Wu, Hao A <hao.a.wu@intel.com>; Ni, Ray 
<ray.ni@intel.com>; Gao, Zhichao <zhichao.gao@intel.com>
Subject: Re: [edk2-devel] [PATCH] Support skipping automatic BM 
enumeration

+Ray, +Zhichao

(although, the actual patch seems to be missing from the posting)

Thanks
Laszlo

On 10/30/19 04:47, Ashish Singhal wrote:
Right now, any and every handle with a BlockIO or SimpleFileSystem 
or LoadFile protocol installed on the system is used to enumerate BM 
automatically. There may be cases where on a platform, some of these 
are not desirable to be enumerated automatically. This patch adds 
support for skipping this automatic enumeration if on the same 
handle, a new protocol defined as EdkiiSkipBmAutoEnumerate is found 
to be
installed.

Ashish Singhal (1):
 MdeModulePkg/UefiBootManagerLib: Support skipping BM enumeration

.../Include/Protocol/SkipBmAutoEnumerate.h         | 25 ++++++++++++++
MdeModulePkg/Library/UefiBootManagerLib/BmBoot.c   | 40
+++++++++++++++++++++-
.../Library/UefiBootManagerLib/InternalBm.h        |  1 +
.../UefiBootManagerLib/UefiBootManagerLib.inf      |  1 +
MdeModulePkg/MdeModulePkg.dec                      |  3 ++
5 files changed, 69 insertions(+), 1 deletion(-)  create mode 
100644 MdeModulePkg/Include/Protocol/SkipBmAutoEnumerate.h



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