OpenSystemsDevelopment / usbboot

This is a very old test image and shouldn't be in this repo.
Since it's bit rotted remove it to avoid confusion.

The image should probably be published via a different repo.

Update the default EEPROM image to 2021-12-02

See: https://github.com/raspberrypi/usbboot/issues/102

Signed-off-by: Phil Elwell <phil@raspberrypi.com>

All the bootloader changes to support secure boot are now in the
stable EEPROM release so switch to that.

Update default pieeprom.bin to the rpi-eeprom stable release

Fix some minor shellcheck warnings

Delete the target file before attempting to replace it, sync before
unmount and set the ownership to be that of the sudo user and not
just root.

secure-boot: Add more documentation about the RSA signatures and add an optional public key argument

Add some more detail about the RSA signatures.

Tweak update-pieeprom.sh so add a separate argument for the public key in
order to make it easier to customize the script for hardware security modules.

I missed correcting the description in https://github.com/raspberrypi/usbboot/pull/96/commits/14e28be2280212b07d3d64ea20609d76da8145fe

Corrected the prune the files to those required for the given board  flag

Update udev rules to use uaccess tag

This has fewer dependencies and avoids problems where the temporary
disk image is automounted.

Add an example boot.img file signed with tools/example-private.pem.

Initial BETA release for secure-boot.

secure-boot adds two new sub-directory to usbboot:

* secure-boot-recovery is used to create an EEPROM signed with
  the customer's RSA private key and configures the 2711 OTP
  settings permenantely require signed boot images.
  See secure-boot-recovery/README.md
* Once secure-boot is enabled the CM4 MSD mode firmware must
  also be signed with the customer's RSA private key.
  See secure-boot-msd/README.md

N.B The revoke_devkey and program_jtag_lock are NOT enabled in
this initial BETA release.

Update to the latest bootcode.bin built from top-of-tree source repo.

Update bootcode4.bin

Update this binary to the latest.
Also rebuilt the windows installer

bootloader: Remove NVMe beta files

The latest bootloader now supports NVMe

Fix `install` and `uninstall` targets in Makefile.

Add `install` target for  executable and default
`bootcode.bin`/`bootcode4.bin` and
`start.elf`/`start4.elf` files.

Update `uninstall` target.

Update Raspberry Pi 4 EEPROM to pieeprom-2021-07-06

Select the latest, stable bootloader EEPROM release which supports NVMe.

Update start4.elf (USB MSD firmware) to top-of-tree.

readme: add macOS build step

Adds instructions for macOS users.
It will mainly help with the perception that this only works on ubuntu.
You can also use this on macOS without a problem.

Update bootcode4.bin to avoid some blocking operations which can cause
USB errors.