简介
最近看树莓派的io很慢，然后想着换个高速卡，或者系统放在u盘里，后来看了下，貌似树莓派4现在已经支持了直接冲usb启动
操作
首先更新固件到最新的版本
sudo rpi-eeprom-update
一般来说会现实
*** UPDATE AVAILABLE ***
BOOTLOADER: update available
CURRENT: Thu 29 Apr 16:11:25 UTC 2021 (1619712685)
LATEST: Tue 25 Jan 14:30:41 UTC 2022 (1643121041)
RELEASE: default (/lib/firmware/raspberrypi/bootloader/default)
Use raspi-config to change the release.
VL805_FW: Dedicated VL805 EEPROM
VL805: up to date
CURRENT: 000138a1
LATEST: 000138a1
表示你有固件更新
之后就是更新
rpi-eeprom-update -a
*** INSTALLING EEPROM UPDATES ***
BOOTLOADER: update available
CURRENT: Thu 29 Apr 16:11:25 UTC 2021 (1619712685)
LATEST: Tue 25 Jan 14:30:41 UTC 2022 (1643121041)
RELEASE: default (/lib/firmware/raspberrypi/bootloader/default)
Use raspi-config to change the release.
VL805_FW: Dedicated VL805 EEPROM
VL805: up to date
CURRENT: 000138a1
LATEST: 000138a1
CURRENT: Thu 29 Apr 16:11:25 UTC 2021 (1619712685)
UPdate: Tue 25 Jan 14:30:41 UTC 2022 (1643121041):00
BOOTFS: /boot
EEPROM updates pending. Please reboot to apply the update.
To cancel a pending update run "sudo rpi-eeprom-update -r".
然后重启就好了
使用usb启动之后果然io快了很多，顺便我还换成了64位的系统
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