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

[Ike Panhc]

Thanks. initramfs-tools in trusty-proposed solves this issue.

ubuntu at test:~$ zcat /boot/initrd.img-4.4.0-62-generic  | cpio -idmv 2> /dev/null 
ubuntu at test:~$ find . -name 'xhci-plat*'
./lib/modules/4.4.0-62-generic/kernel/drivers/usb/host/xhci-plat-hcd.ko
ubuntu at test:~$ dpkg --list | grep initramfs-tools
ii  initramfs-tools                      0.103ubuntu4.7                    all          tools for generating an initramfs
ii  initramfs-tools-bin                  0.103ubuntu4.7                    amd64        binaries used by initramfs-tools


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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:
  Invalid
Status in initramfs-tools source package in Trusty:
  Fix Committed
Status in initramfs-tools source package in Xenial:
  Fix Released
Status in initramfs-tools source package in Zesty:
  Invalid

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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