树莓派4从USB启动
Easy Way
$ sudo raspi-config
-> 6 Advanced Options
-> A7 Bootloader Version
-> E1 Latest
-> Reboot
Hard Way
$ cat /proc/device-tree/model
Raspberry Pi 4 Model B Rev 1.2
$ uname -a
Linux raspberrypi 5.4.83-v7l+ #1379 SMP Mon Dec 14 13:11:54 GMT 2020 armv7l GNU/Linux
$ sudo rpi-eeprom-update
BCM2711 detected
Dedicated VL805 EEPROM detected
*** UPDATE AVAILABLE ***
BOOTLOADER: update available
CURRENT: Mon 15 Jul 12:59:55 UTC 2019 (1563195595)
LATEST: Thu 3 Sep 12:11:43 UTC 2020 (1599135103)
FW DIR: /lib/firmware/raspberrypi/bootloader/critical
VL805: update available
CURRENT: 00013701
LATEST: 000138a1
$ sudo rpi-eeprom-update -a
BCM2711 detected
Dedicated VL805 EEPROM detected
*** INSTALLING EEPROM UPDATES ***
BOOTLOADER: update available
CURRENT: Mon 15 Jul 12:59:55 UTC 2019 (1563195595)
LATEST: Thu 3 Sep 12:11:43 UTC 2020 (1599135103)
FW DIR: /lib/firmware/raspberrypi/bootloader/critical
VL805: update available
CURRENT: 00013701
LATEST: 000138a1
BOOTFS /boot
EEPROM updates pending. Please reboot to apply the update.
$ sudo reboot
参考: https://www.raspberrypi.org/documentation/hardware/raspberrypi/booteeprom.md
The rpi-eeprom-update
systemd
service runs at startup and applies an update if a new image is available, automatically migrating the current bootloader configuration.
既然已经会自动更新EEPROM了,那么上述操作就没必要了!