Re: 5.2: arm-smmu e0600000.smmu: Unexpected global fault, this could be serious

On Aug 06 2019, Robin Murphy [off-list ref] wrote:

I take it you have firmware still using the old "mmu-masters" DT binding
on that machine?

Yes.

The way the legacy binding is handled turns out to interact badly with the
disable_bypass option, so CONFIG_ARM_SMMU_DISABLE_BYPASS_BY_DEFAULT is
presumably now tripping you up. The immediate workaround would be to turn
that off and/or boot with "arm-smmu.disable_bypass=0" to ensure it's
overridden.

I will try the command line parameter.

If you can update the firmware to something newer using either
the generic "iommus" binding or ACPI (I believe Seattle is supported in
EDK2 these days) that would remove the problem entirely.

AMD won't be releasing any new firmware for their seattle platform.

Andreas.

-- 
Andreas Schwab, SUSE Labs, schwab@suse.de
GPG Key fingerprint = 0196 BAD8 1CE9 1970 F4BE  1748 E4D4 88E3 0EEA B9D7
"And now for something completely different."

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