[Bug 1649213] Re: Support rootfs on xhci-plat-hcd attached storage

[Ike Panhc]

bug 1625222 is duplicated bug for kernel which already in progress. To
use that one for tracking kernel makes more sense to me.

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https://bugs.launchpad.net/bugs/1649213

Title:
  Support rootfs on xhci-plat-hcd attached storage

Status in initramfs-tools package in Ubuntu:
  New
Status in linux package in Ubuntu:
  Incomplete
Status in initramfs-tools source package in Trusty:
  New
Status in linux source package in Trusty:
  New
Status in initramfs-tools source package in Xenial:
  New
Status in linux source package in Xenial:
  New
Status in initramfs-tools source package in Zesty:
  New
Status in linux source package in Zesty:
  Incomplete

Bug description:
  [Impact]
  If you install Ubuntu onto USB storage behind a Platform USB host controller, it will not be able to boot because the generated initramfs will not include the host controller driver.

  [Test Case]
  Install to a USB stick attached to platform USB controller and reboot. Booting will fail because it will be unable to find the root file system.

  [Regression Risk]
  Driver is only loaded when system requires xhci-plat-hcd, minimizing the impact to all other systems.

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