** Changed in: linux (Ubuntu)
Status: New => In Progress
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https://bugs.launchpad.net/bugs/2088458
Title:
noble/jammy arm-smmu and firmware discrepancy
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Jammy:
New
Status in linux source package in Noble:
New
Bug description:
For some of the arm64 systems arm-smmu driver doesn't seem to work
with older versions of the firmware where it encounters "mmu-masters"
in the device-tree.
In this case, kernel is unable to map simple drm device and fail to
boot (Note that for "DMA_API" it works fine). See,
drivers/iommu/arm/arm-smmu/arm-smmu.c:arm_smmu_device_dt_probe() for
more information.
I have seen the error for the following arm64 instances in
testflinger: moigno, igor, egede. Updating the firmware seems like one
of the possible solutions.
I have seen this error in 6.8 kernels (noble+jammy). However, both
series should fail regardless of the kernel version.
Focal can be different since "CONFIG_ARM_SMMU_LEGACY_DT_BINDINGS"
config options is not defined there. If Focal works, we can remove
this config option from Jammy and Noble.
See error messages below for more information.
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