There is a way to associate a hot key with an application, but no way to lock
the boot order (other than Secure Boot).
In general EFI is designed to move policy into the Platform as the platform,
and its user most likely know best. An application can be loaded on a Phone, an
ATM machine or a PC. The default platform policies might need to be different
on these different systems. So EFI defers to the platform designer, and/or the
platform owner, to make policy decisions.
Thanks,
Andrew Fish
On Jul 22, 2013, at 8:20 PM, "Tian, Feng" <feng.t...@intel.com> wrote:
> I have no good idea on this. Let’s wait for others input.
>
> From: André Dantas [mailto:andre.dan...@lsbd.ufc.br]
> Sent: Tuesday, July 23, 2013 02:07
> To: Tian, Feng
> Cc: Felipe Martins; edk2-devel@lists.sourceforge.net
> Subject: Re: [edk2] UEFI drivers dependency and ExitBootServices() event
> limitations
>
> Hi Feng,
>
> Thank you for your reply. I believe that this solution works fine. However, I
> have a doubt. Your suggestion does not guarantee that my application will run
> always, because another callback function can modify BootOrder variable and
> remove my Boot option from it. Is there another way to do this without having
> to add a new boot option?
>
>
> On Mon, Jul 22, 2013 at 3:40 AM, Tian, Feng <feng.t...@intel.com> wrote:
> One way I can think is:
>
> - Invokes EfiCreateEventReadyToBootEx() to register a platform
> callback function which is used to update “BootCurrent” and “BootOrder”
> variables to point to your application.
>
>
> From: André Dantas [mailto:andre.dan...@lsbd.ufc.br]
> Sent: Saturday, July 20, 2013 02:52
> To: Felipe Martins
> Cc: edk2-devel@lists.sourceforge.net
> Subject: Re: [edk2] UEFI drivers dependency and ExitBootServices() event
> limitations
>
> Hi everyone,
>
> Is there a way to define that an uefi application is called immediately
> before end of the boot with priority level TPL_APPLICATION?
>
> Thanks,
>
>
> On Thu, Jul 18, 2013 at 4:09 PM, Felipe Martins <ffm...@gmail.com> wrote:
> Thank you so much, that's exactly what we needed! :D
>
>
> 2013/7/18 Andrew Fish <af...@apple.com>
> It is possible to use gBS->CreateEventEx() to register for an
> EFI_EVENT_GROUP_READY_TO_BOOT to know that the system is about to attempt to
> boot. This is generally used to complete tables needed for the OS handoff.
>
> It is possible to gBS->RegisterProtocolNotify() for EFI_LOADED_IMAGE_PROTOCOL
> to know when an image is loaded.
>
> Thanks,
>
> Andrew Fish
>
>
> On Jul 18, 2013, at 11:28 AM, Felipe Martins <ffm...@gmail.com> wrote:
>
> Hello everyone,
>
> My team needs to implement an UEFI driver(A service driver, to be precise)
> that exports a few functions and consumes the protocols from a third-party
> UEFI driver to execute a relatively complex routine. This latter routine
> should preferably be executed after all the other UEFI images are loaded
> during the boot(I can't detail why this is so). Given these constraints,
> We've come to the following points:
>
>
> We could execute the routine in the driver entry point: however, there are no
> guarantees that the third-party driver protocol will be available when our
> driver is loaded(since it's not possible to specify dependencies among UEFI
> drivers);
> We could register the routine as a notification function for an
> EVT_SIGNAL_EXIT_BOOT_SERVICES event: this would guarantee that our driver is
> loaded after the third-party one and would address the preference mentioned
> in the previous paragraph, but it imposes the serious limitation of not being
> able to use Memory Allocation services in this routine, which makes it
> impossible to be implemented, in practice. As far as I understood from the
> specs, there are also no guarantees that the third-party driver will still be
> in memory when the routine is called.
> So, here comes my doubt: is it possible to, somehow, specify a dependency
> among UEFI drivers(i.e, to guarantee that one driver is loaded before the
> other)? Also, are there any workarounds to the issues raised about using the
> EVT_SIGNAL_EXIT_BOOT_SERVICES event?
>
> Thanks in advance,
>
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> André Dantas
> Developer
> GTalk: andre.dan...@lsbd.ufc.br
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>
>
>
>
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