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Message #60576
[Bug 1311738] Re: Disable PAMU on Freescale kernels
This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
trusty' to 'verification-done-trusty'.
If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.
See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!
** Tags added: verification-needed-trusty
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https://bugs.launchpad.net/bugs/1311738
Title:
Disable PAMU on Freescale kernels
Status in “linux” package in Ubuntu:
In Progress
Status in “linux” source package in Trusty:
In Progress
Bug description:
In Saucy/v3.11 kernel, we used the PAMU SAUCE patch from Freescale.
The current upstreamed PAMU code appears to break fsl-ehci by
restricting proper access to memory locations associated with it.
PAMU is an IOMMU extension that protects and prevents access to
portions of memory that are known to be reserved for hardware use.
This extension is not needed for normal runtime, so rather than allow
broken EHCI, let's disbale this until PAMU can be fixed.
This only affects Freescale PowerPC kernel variations.
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References