Re: writing EDK compatible application.

[Laszlo Ersek <lersek@redhat.com>]

On 07/04/17 19:20, Amit kumar wrote:
> 
> HI,
> 
> I have written a code (say helloworld program ) using edk2 framework, named the output efi file as BOOTx64.efi and placed it on a removable media in EFI/BOOT/ directory so that the application is listed in one time boot menu. When selected from boot menu it prints "Hello World".
> Which works as expected when tested on UEFI 2.3 and above platforms.
> But the same code fails to execute on EFI 1.10 platforms. Which i suppose is the problem with application entry point.
> Can somebody suggest me a way so that the application entry function can be compatible to both the platform. Even when written according to UEFI 2.5+ Spec ?

I don't think you can develop for EFI 1 using edk2 -- unless you use
EdkCompatibilityPkg I guess. But, I don't know how much
EdkCompatibilityPkg is maintained.

Here's some links:

https://github.com/tianocore/tianocore.github.io/wiki/EdkCompatibilityPkg

https://github.com/tianocore/tianocore.github.io/wiki/EDK

The entry point is likely the least of your problems. The library
instances pulled in from under MdePkg, MdeModulePkg etc are full of UEFI
2.* dependencies, I'm pretty sure. I would suggest ignoring EFI 1...

Thanks
Laszlo