<p></p>
<p><a class="user-mention" data-hovercard-type="user" data-hovercard-url="/users/JamesWangAmiTw/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/JamesWangAmiTw">@JamesWangAmiTw</a> Thanks for the link.  I have reproduced some kind of lockup using qemu with an iPXE ROM (8086100e.efirom).  The last messages seen on screen are:</p>
<pre><code>Shutting down firmware services...
Using 'simple offset' UEFI RTS mapping policy
</code></pre>
<p>Booting qemu from the ISO does not hang at the same place, so this looks promising as a reproduction.</p>

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