<p></p>
<p>So it looks like netboot.xyz does internally use pipxe, and researching did help me find out how to build pipxe for RPi4. Here is a condensed version:</p>
<ol>
<li>manually update all submodules, in <code>edk2</code>, <code>edk2-platforms</code>, <code>edk2-non-osi</code> and do <code>git pull origin master</code></li>
<li>edit the Makefile, replace <code>RPi3</code> with <code>RPi4</code></li>
<li>also in the Makefile, disable git submodule update as it will then revert the update (just comment the line <code>git submodule update --init --recursive</code>)</li>
<li>also in the Makefile, change <code>IPXE_TGT</code> to <code>bin-arm64-efi/snp.efi</code></li>
<li>run <code>make</code></li>
</ol>
<p>The resulting EFI file seems to work OK on my RPi4.</p>

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