There are numerous drivers disabled in the supplied diff which can be
configured as modules. What's the reason for not including these?

The way we normally handle boot-critical modules is to include them in
the installer, and then they will automatically be included in the
initrd built for each new kernel as it is installed. Is there any
special reason that we need to make the drivers you mentioned built-in
instead of doing this?

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https://bugs.launchpad.net/bugs/1701137

Title:
  enable ARCH_SUNXI (and friends) in arm64 kernel .config

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Artful:
  In Progress

Bug description:
  The mainline support for the ARM64 Allwinner SoCs (featured on the Pine64 
boards and the Pinebook notebook, for instance, as well as other development 
boards like the BananaPi-M64) has come a long way by now, since 4.11 we have 
MMC and USB support working.
  Now can we just enable the proper .config bits to make the official Ubuntu 
kernel support those boards? The latest mainline U-Boot can load an EFI grub 
from some UEFI ESP partition, so any standard EFI installer should work.
  Apart from some minor hiccup (a missing MBR bootable flag/MBR at all) this 
works already with the Debian-testing netinst installer.
  The config symbols needed for decent support are (all enabled by the latest 
Debian kernel and the official mainline defconfig):
  ARCH_SUNXI=y
  CONFIG_USB_MUSB_SUNXI=m
  CONFIG_MMC_SUNXI=m
  CONFIG_RTC_DRV_SUN6I=y
  CONFIG_PHY_SUN4I_USB=y

  Those enable MMC and USB (the mandatory clocks, pinctrl and UART are enabled 
by default) and make those boards quite usable already. The on-SoC Ethernet 
driver will probably be merged into 4.13-rc1.
  Optionally:
  CONFIG_I2C_MV64XXX=m
  CONFIG_SPI_SUN6I=m
  give us I2C and SPI support as well.

  So can we add those symbols to the Ubuntu kernel .config to give users
  an out-of-the-box experience?

  Cheers,
  Andre.

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