> On Nov 4, 2022, at 6:20 AM, d.meneses via groups.io > <d.meneses=softi9...@groups.io> wrote: > > Using DebugLib instead to print a message, I was able to confirm that my > driver is now running properly: > cat debug.log | grep Hello > This works both when adding it in the OVMF build and also when inserted by > UEFITool. > > The drivers is not being listed by the EFI Shell drivers command. > This is expected to me as Dxe Drivers are unloaded after they return. > Nonetheless, the same is happening when I package it as a DXE_RUNTIME_DRIVER. > What is it that I'm missing? >
The UEFI Shell drivers command is managing UEFI Driver Model Drivers [1]. A UEFI Driver Model Driver has no depex and publishes an EFI Driver Binding protocol [2]. The idea is the BDS (platform) can now have the policy of what driver gets connected to what device. This is all managed by gBS->ConnectController()/gBS->DisconnectController(). A DXE Driver just publishes an arbitrary protocol. [1] https://uefi.org/specs/UEFI/2.10/11_Protocols_UEFI_Driver_Model.html [2] https://github.com/tianocore/edk2/blob/master/MdePkg/Include/Protocol/DriverBinding.h PS I seem to remember a question about launching an App…. It is possible to customize a generic UEFIs system boot policy via NVRAM variable. You can read up on that here [3]. If you want to change the platform policy in a secure way to do something you likely need to modify the BDS (Boot Device Selection). The design idea around BDS is you could make a system an ATM or a PC just by changing the policy in the BDS, thus the BDS is a place to centralize the platform policy. The easiest way to customize the edk2 BDS is via a custom PlatformBootManagerLib. You can look at the OVMF instance here [4]. You can use this library to add extra policy on top of the NVRAM variables in the UEFI Spec [3]. If you look at the OVMF example this is how the OVMF platform makes the UEFI Shell a default boot option [5]. [3] https://uefi.org/specs/UEFI/2.10/03_Boot_Manager.html#globally-defined-variables [4] https://github.com/tianocore/edk2/tree/master/OvmfPkg/Library/PlatformBootManagerLib [5] https://github.com/tianocore/edk2/blob/master/OvmfPkg/Library/PlatformBootManagerLib/BdsPlatform.c#L1717 Sorry if I’m mixing up threads. So much email, and so little time…. > Thank you for your attention, > Diogo > -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#96162): https://edk2.groups.io/g/devel/message/96162 Mute This Topic: https://groups.io/mt/94734592/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
