It is possible that it didn't show up in older kernels (4.4 for X)
because Tegra didn't used the IOMMU at that time.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1783746
Title:
ipmmu is always registered
Status in linux package in Ubuntu:
Confirmed
Bug description:
Hi,
booting the bionic kernel (4.15.0-29-generic) on my Tegra20 device (no
iommu), I found it crashes during display driver setup. The bootlog
(and crash) is attached. Asking on Tegra IRC channel, digetx found
that this is caused by the IPMMU-VMSA driver which is always
registered via initcall. Adding "initcall_blacklist=ipmmu_init" to the
kernel parameters makes it boot fine.
Maybe this buggy driver should be disabled in the config (or fixed
somehow)?
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