Add links to firmware and rpi-eeprom repos

Author: ghollingworth

documentation/asciidoc/computers/software-sources.adoc

@@ -46,6 +46,14 @@ The following is a curated list of repositories which most people are interested
 https://github.com/raspberrypi/linux::
 This repository contains the source code for the downstream Linux kernel supported and working on all versions of Raspberry Pi from Pi 1 to Pi 5.
 
+https://github.com/raspberrypi/firmware::
+This repository contains the closed source firmware, although the following two links are useful:
+* https://github.com/raspberrypi/firmware/commits/master/[Changelog for the firmware]
+* https://github.com/raspberrypi/firmware/blob/master/boot/overlays/README[Device tree overlay README]
+
+https://github.com/raspberrypi/rpi-eeprom::
+Installation scripts and binaries for the Raspberry Pi 4 and Raspberry Pi 5 bootloader EEPROMs including the https://github.com/raspberrypi/rpi-eeprom/releases[releases]
+
 === Libraries and applications
 
 https://github.com/raspberrypi/utils::