Raspberry Pi OS
Install Raspberry Pi OS on your Surface RT
Raspberry Pi OS booted for the first time on Surface RT
Make sure that Secure boot is disabled before you try to boot Linux.
Use this guide

Install Raspberry Pi OS

Installing Raspberry Pi OS is very easy in comparison to some other distros.
It can be done on a Windows or Linux host and therefore is easily accessible for everyone.

Install on SD/USB for UEFI

  1. 1.
    Grab all the "standard files" from - (usb-linux-boot.zip, zImage, tegra30-microsoft-surface-rt-efi.dtb).
  2. 2.
    Use Raspberry Pi OS Imager (sudo apt install rpi-imager) to image a USB drive as you normally would.
  3. 3.
    Place the efi folder, startup.nsh, zImage, and tegra30-microsoft-surface-rt-efi.dtb files onto the "boot"/fat32 partition of the USB drive. Confirming any overwrites.
  4. 4.
    Edit the startup.nsh file on the USB drive to show as below. For further information about kernel params can be found here
  5. 5.
    Download the modules and firmware - kernel modules - and place them in the root directory /. This is important. Without modules some features like Wifand i or CPU Temperature Sensor won't work.
    If you are using Linux you can do this before booting RaspiOS for the first time on your host machine.
    If you are using Windows you need to boot RaspiOS on Surface RT and copy the modules on from e.g another Fat32 USB to the root filesystem. You need to reboot once to load the modules correctly.
fs0:
zImage dtb=tegra30-microsoft-surface-rt-efi.dtb root=/dev/sda2 rootwait console=tty0 cpuidle.off=1
# shutdown if something went wrong
reset -s
Insert the USB Drive into the Surface RT and Boot to the USB.

Install on eMMC for UEFI

You need to install RaspiOS on USB first
It is only recommended to install it on eMMC if you really want to use it on eMMC. Otherwise you will wear out your eMMC unnecessarily.
Taken from Discord user Misterobots:
  1. 1.
    Once Raspberry Pi OS has booted from USB.
    Go to Start menu -> Accessories -> SD Card Copier.
    Select the USB drive as the "From".
    Select the eMMC (mine was MBG4GA) as the "To".
    Check the box that says "New Partition UUIDs". Click Start
  2. 2.
    Edit the startup.nsh (on the eMMC boot partition, that was just copied to) and change the root=/dev/sda2 to root=/dev/mmcblk0p2. Then save.
  3. 3.
    Once the Copy has finished (with no errors), shutdown the Surface RT, remove the USB drive, then power on the Surface RT normally. (do not hold Vol. down)
This should get you booted from eMMC with both boot and rootfs on the eMMC.

TODO after booting/installing

If you want to install Raspi OS on eMMC do the steps below after booting from eMMC.
There is only one thing to do after you can see the desktop. Open the Terminal and enter sudo raspi-config Choose Advanced Options Choose Expand Filesystem Now your SD Card / eMMC is writable and can use all of its space.
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Outline
Install Raspberry Pi OS
Install on SD/USB for UEFI
Install on eMMC for UEFI
TODO after booting/installing