Add native Raspberry Pi Imager port - beta

Author: tim

Readme.md

@@ -10,21 +10,16 @@ embedded versions of bootcode.bin and start.elf are used to enable the MSD behav
 
 For more information run 'rpiboot -h'
 
-## Compute Module 4
-On Compute Module 4 the EMMC disable jumper (GPIO 40) must be fitted to switch
-the ROM to usbboot mode. Otherwise, the SPI EEPROM bootloader image will be loaded
-instead.
-
 ## Building
 
 Clone this on your Pi or an Ubuntu linux machine
 
 ```
-$ git clone --depth=1 https://github.com/raspberrypi/usbboot
-$ cd usbboot
-$ sudo apt install libusb-1.0-0-dev
-$ make
-$ sudo ./rpiboot
+git clone --depth=1 https://github.com/raspberrypi/usbboot
+cd usbboot
+sudo apt install libusb-1.0-0-dev
+make
+sudo ./rpiboot
 ```
 
 ## Running your own (not MSD) build
@@ -37,8 +32,31 @@ you can build an initramfs into the kernel, add an initramfs to the boot directo
 other interface to the filesystem.
 
 ```
-$ sudo ./rpiboot -d boot
+sudo ./rpiboot -d boot
 ```
 
 This will serve the boot directory to the Raspberry Pi Device.
 
+## Compute Module 4
+On Compute Module 4 EMMC-DISABLE / nRPIBOOT (GPIO 40) must be fitted to switch the ROM to usbboot mode.
+Otherwise, the SPI EEPROM bootloader image will be loaded instead.
+
+### Raspberry Pi Imager - BETA
+The Raspberry Pi Imager can be run natively on the CM4 providing a GUI for downloading and installing the operating system.
+
+Beta notes:
+* The current version runs rpi-update upon completion in order to update the firwamre and kernel to support NVMe.
+* uart_2ndstage is enabled 
+* The HDMI display is limited to 1080p to avoid potential problems with cables etc if a 4K display is attached.
+
+For NVMe boot update the bootloader first:  
+```
+sudo ./rpiboot -d nvme
+```
+
+Run Raspberry Pi Imager:  
+```
+sudo ./rpiboot -d imager
+```
+
+Once the imager is running you will be prompted to remove the micro-usb cable and connect a mouse.

imager/.gitignore

@@ -0,0 +1 @@
+*.h

imager/boot.img

@@ -0,0 +1,3 @@
+boot_ramdisk=1
+uart_2ndstage=1
+