Hello Maciej:
I met an issue when tried to do the PXE boot with keeping the ipxe.efi as boot file.
When iPXE.efi is set as boot file once it downloaded it again starts, it does the download and start of iPXE continuously and at some point it asserts in MNP Driver.
When it trying to access the context of SNP Context in MNP driver it asserts.
Have we ever validated Ipxe as the Pxt Boot file?
-Siva