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 -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp