make-release: Add a script for generating Raspberry Pi Imager releases

Create an EEPROM update zip files for use with the Raspberry Pi Imager.
The Raspberry Pi Imager JSON will soon be updated to support the 3
different boot priority choices offered by raspi-config.

imager/README.txt

@@ -0,0 +1,28 @@
+Raspberry Pi 4 EEPROM bootloader rescue image
+*********************************************
+
+The Raspberry Pi4 has a small EEPROM used to store the bootloader.
+
+This rescue image reverts the bootloader EEPROM to factory default settings.
+
+This rescue image also updates the USB 3.0 (VL805) firmware to the latest
+version (138a1) with better full-speed Isochronous endpoint support.
+
+To re-flash the EEPROM(s)
+
+1. Unzip the contents of this zip file to a blank FAT formatted SD-SDCARD.
+2. Power off the Raspberry Pi
+3. Insert the sd-card.
+4. Power on Raspberry Pi
+5. Wait at least 10 seconds.
+
+This easiest method for creating and formatting the SD-CARD is to use the
+Raspberry Pi Imager from https://raspberrypi.org/downloads
+
+If successful, the green LED light will blink rapidly (forever), otherwise
+an error pattern will be displayed.
+
+If a HDMI display is attached then screen will display green for success
+or red if failure a failure occurs.
+
+N.B. This image is not a bootloader it simply replaces the on-board bootloader.

imager/boot-conf-default.txt

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+[all]
+BOOT_UART=0
+WAKE_ON_GPIO=1
+ENABLE_SELF_UPDATE=1
+BOOT_ORDER=0xf41
+

imager/boot-conf-network.txt

@@ -0,0 +1,6 @@
+[all]
+BOOT_UART=0
+WAKE_ON_GPIO=1
+ENABLE_SELF_UPDATE=1
+BOOT_ORDER=0xf21
+

imager/boot-conf-sd.txt

@@ -0,0 +1,6 @@
+[all]
+BOOT_UART=0
+WAKE_ON_GPIO=1
+ENABLE_SELF_UPDATE=1
+BOOT_ORDER=0xf41
+

imager/boot-conf-usb.txt

@@ -0,0 +1,6 @@
+[all]
+BOOT_UART=0
+WAKE_ON_GPIO=1
+ENABLE_SELF_UPDATE=1
+BOOT_ORDER=0xf14
+

imager/make-release

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+#!/bin/sh
+
+# Generates three variants of the rpi-eeprom-recovery.zip file for
+# SD, USB and NETWORK priority matching the raspi-config options.
+
+set -e
+
+script_dir=$(cd "$(dirname "$0")" && pwd)
+tmp_dir=""
+
+die() {
+   echo "$@" >&2
+   exit 1
+}
+
+cleanup() {
+   if [ -d "${tmp_dir}" ]; then
+      rm -rf "${tmp_dir}"
+   fi
+   tmp_dir=""
+}
+
+gen_release() {
+   config="${1}"
+   out="${2}"
+
+   [ -f "${config}" ] || die "File not found \"${config}\""
+
+   (
+      tmp_dir="$(mktemp -d)"
+      cd "${tmp_dir}"
+      cp "${script_dir}/vl805.bin" .
+      cp "${script_dir}/README.txt" .
+      sha256sum vl805.bin | awk '{print $1}' > vl805.sig
+
+      "${script_dir}/../rpi-eeprom-config" \
+         --config "${script_dir}/${config}" --out pieeprom.bin \
+         "${script_dir}/pieeprom.bin" || die "Failed to create update EEPROM config with  \"${config}\""
+      sha256sum pieeprom.bin | awk '{print $1}' > pieeprom.sig
+      echo "Creating ${out}"
+      zip "${out}" *
+   )
+}
+
+usage() {
+cat <<EOF
+   make-release <tag>
+
+   Example tag "2020-09-03-vl805-000138a1"
+EOF
+exit
+}
+
+trap cleanup EXIT
+tag="${1}"
+[ -n "${tag}" ] || usage
+release_dir="${script_dir}/release"
+rm -rf "${release_dir}"
+mkdir "${release_dir}"
+
+# Build the different boot priority flavours
+gen_release boot-conf-default.txt "${release_dir}/rpi-boot-eeprom-recovery-${tag}.zip"
+gen_release boot-conf-sd.txt "${release_dir}/rpi-boot-eeprom-recovery-${tag}-sd.zip"
+gen_release boot-conf-usb.txt "${release_dir}/rpi-boot-eeprom-recovery-${tag}-usb.zip"
+gen_release boot-conf-network.txt "${release_dir}/rpi-boot-eeprom-recovery-${tag}-network.zip"

imager/pieeprom.bin

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+../firmware/critical/pieeprom-2020-09-03.bin

imager/recovery.bin

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+../firmware/critical/recovery.bin

imager/vl805.bin

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+../firmware/critical/vl805-000138a1.bin