Hello,
I am trying to solve a TPL issue...
Use Case: Download ACPI tables (actually it is the Device Tree but the
principle is the same) from the network before BDS is started for enabling
developers to work on his ACPI/FDT tables on his host machine. The path of the
file is defined by a UEFI Device Path.
My current design was to make the ACPI/FDT Platform driver waiting for the PI
signal EndOfDxe
(https://github.com/tianocore/edk2/blob/master/EmbeddedPkg/Drivers/FdtPlatformDxe/FdtPlatform.c#L124).
And to download the file(s) when this event is signalled
(https://github.com/tianocore/edk2/blob/master/EmbeddedPkg/Drivers/FdtPlatformDxe/FdtPlatform.c#L204).
The issue with this design is the EndOfDxe event is called at TPL_CALLBACK. And
the DHCP & TFTP stack cannot be initialized at TPL_CALLBACK
(https://github.com/tianocore/edk2/blob/master/MdeModulePkg/Universal/Network/Dhcp4Dxe/Dhcp4Impl.c#L824).
I can see few solutions to solve my issue but I do not like none of them :(:
- Solution A: Encapsulate the use case in an EFI application/Driver
that would be invoked by the user in BDS (either in the EFI Shell or as a
Driver#### boot entry)
Drawback: it means the user has to do a specific action for this use case.
- Solution B: Replace EnfOfDxe event to use a dummy EFI protocol that
would be installed by the BDS
Drawback: it means the mechanism must be implemented in every BDS. While I am
looking for a generic solution.
- Solution C: Return an error saying the UEFI specification does not
allow this use case.
Drawback: So what is the alternative? Changing the spec?
- Solution D: Change my implementation to download a file from TFTP
and make the implementation non-blocking/asynchronous when called at
TPL_CALLBACK.
Drawback: it makes the implementation much more complicated to maintain. And I
cannot guarantee the file is downloaded when the BDS is started.
Any comment/suggestion?
Thanks,
Olivier
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