Update rpi.md

Author: nicholaswilde

docs/rpi.md

@@ -1,12 +1,34 @@
-# RPi
+# :simple-raspberrypi: RPi
 
-## Raspberry Pi 4 boot from usb
+## [Raspberry Pi 4 boot from usb][1]
 
 ```shell
 # to get vendorId and deviceId
 $ dmesg
 $ sudo nano /boot/cmdline.txt
 usb-storage.quirks=152d:1561:u console=serial0,115200 console=tty1 root=PARTUUID=fcf4cb94-02 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait
+$ echo program_usb_boot_mode=1 | sudo tee -a /boot/config.txt
+```
+
+```shell
+vcgencmd otp_dump | grep 17
+17:1020000a=USB boot disabled
+17:3020000a=USB boot enabled
+```
+
+```shell
+sudo raspi-config
+sudo rpi-update
+```
+
+## [Generate User Before Boot][2]
+
+```shell
+echo 'mypassword' | openssl passwd -6 -stdin | sudo tee -a /boot/userconf.txt
+# /boot/userconf.txt
+user:password-hash
+# Enable ssh
+touch /boot/ssh
 ```
 
 ## Ruby
@@ -65,3 +87,6 @@ sudo dphys-swapfile swapon
 ```
 
 ## References
+
+[1]: <https://www.makeuseof.com/how-to-boot-raspberry-pi-ssd-permanent-storage/>
+[2]: <https://www.raspberrypi.com/news/raspberry-pi-bullseye-update-april-2022/>