Raspberry Pi 4 Model B
Raspberry Pi OS
rpi-firmware のダウングレード
https://github.com/raspberrypi/rpi-firmware のダウングレードには rpi-update
を利用する
$ which rpi-update
/usr/bin/rpi-update
rpi-update
の引数に https://github.com/raspberrypi/rpi-firmware
のコミットハッシュを渡して実行することでダウングレードできる
$ sudo rpi-update 224cd2fe45becbb44fea386399254a1f84227218
*** Raspberry Pi firmware updater by Hexxeh, enhanced by AndrewS and Dom
*** Performing self-update
*** Relaunching after update
*** Raspberry Pi firmware updater by Hexxeh, enhanced by AndrewS and Dom
FW_REV:224cd2fe45becbb44fea386399254a1f84227218
*** We're running for the first time
*** Backing up files (this will take a few minutes)
*** Backing up firmware
*** Backing up modules 6.1.21-v8+
WANT_32BIT:0 WANT_64BIT:1 WANT_PI4:1
#############################################################
WARNING: This update bumps to rpi-5.15.y linux tree
See: https://forums.raspberrypi.com/viewtopic.php?t=322879
'rpi-update' should only be used if there is a specific
reason to do so - for example, a request by a Raspberry Pi
engineer or if you want to help the testing effort
and are comfortable with restoring if there are regressions.
DO NOT use 'rpi-update' as part of a regular update process.
##############################################################
Would you like to proceed? (y/N)
*** Downloading specific firmware revision (this will take a few minutes)
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
100 112M 0 112M 0 0 3460k 0 --:--:-- 0:00:33 --:--:-- 4138k
*** Updating firmware
*** Updating kernel modules
*** depmod 5.15.76-v8+
*** Updating VideoCore libraries
*** Using SoftFP libraries
*** Updating SDK
*** Running ldconfig
*** Storing current firmware revision
*** Deleting downloaded files
*** Syncing changes to disk
*** If no errors appeared, your firmware was successfully updated to 224cd2fe45becbb44fea386399254a1f84227218
*** A reboot is needed to activate the new firmware
kernel header の指定バージョンをインストールする
以下から探す
http://archive.raspberrypi.org/debian/pool/main/r/raspberrypi-firmware/