[Bug 1842284] Re: initramfs does not copy ehci-platform

[Ike Panhc]

ehci-platform is built-in for amd64/i386 but is module in other arch

$ git grep EHCI_HCD_PLATFORM debian.hwe/config
debian.hwe/config/amd64/config.common.amd64:CONFIG_USB_EHCI_HCD_PLATFORM=y
debian.hwe/config/annotations:CONFIG_USB_EHCI_HCD_PLATFORM                    policy<{'amd64': 'y', 'arm64': 'm', 'armhf': 'n', 'i386': 'y', 'ppc64el': 'm'}>
debian.hwe/config/annotations:CONFIG_USB_EHCI_HCD_PLATFORM                    mark<ENFORCED> note<Don't use the generic ehci/ohci code on omap, it doesn't work> flag<REVIEW>
debian.hwe/config/arm64/config.common.arm64:CONFIG_USB_EHCI_HCD_PLATFORM=m
debian.hwe/config/armhf/config.common.armhf:# CONFIG_USB_EHCI_HCD_PLATFORM is not set
debian.hwe/config/i386/config.common.i386:CONFIG_USB_EHCI_HCD_PLATFORM=y
debian.hwe/config/ppc64el/config.common.ppc64el:CONFIG_USB_EHCI_HCD_PLATFORM=m
debian.hwe/config/x32/config.common.x32:CONFIG_USB_EHCI_HCD_PLATFORM=m
debian.hwe/config/x32/config.flavour.generic:CONFIG_USB_EHCI_HCD_PLATFORM=m

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https://bugs.launchpad.net/bugs/1842284

Title:
  initramfs does not copy ehci-platform

Status in initramfs-tools package in Ubuntu:
  Fix Released
Status in initramfs-tools source package in Xenial:
  Fix Committed
Status in initramfs-tools source package in Bionic:
  Fix Released
Status in initramfs-tools source package in Disco:
  Fix Released
Status in initramfs-tools source package in Eoan:
  Fix Released

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 ehci-platform, minimizing the impact to all other systems.

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