kernel-packages team mailing list archive

[Tim Gardner <tim.gardner@xxxxxxxxxxxxx>]

Public bug reported:

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.

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Ben Collins (ben-collins)
         Status: In Progress

** Affects: linux (Ubuntu Trusty)
     Importance: Undecided
     Assignee: Ben Collins (ben-collins)
         Status: In Progress

** Also affects: linux (Ubuntu Trusty)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Trusty)
       Status: New => In Progress

** Changed in: linux (Ubuntu Trusty)
     Assignee: (unassigned) => Ben Collins (ben-collins)

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1311738/+subscriptions