This is causing complete instability on zork devices. Have you verified the coreboot IVRS table on zork with IOMMU turned on?

Only tested on Mandolin since Jason already tested on a zork device; I'm however not sure if with the no iommu kernel parameter removed from depthcharge. On Mandolin the patch didn't cause issues, but improved things

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Gerrit-Project: coreboot
Gerrit-Branch: master
Gerrit-Change-Id: Idee1c7e829282427ee80f7d7071793b000936810
Gerrit-Change-Number: 44897
Gerrit-PatchSet: 1
Gerrit-Owner: Furquan Shaikh <furquan@google.com>
Gerrit-Reviewer: Aaron Durbin <adurbin@chromium.org>
Gerrit-Reviewer: Felix Held <felix-coreboot@felixheld.de>
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Gerrit-Comment-Date: Fri, 28 Aug 2020 15:10:41 +0000
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