@reply #21,
The simplest workaround is to plug the sd card into a cardreader and connect the cardreader to computer, then edit $mount_folder/system-boot/config.txt
Add total_mem=3072 in the section [pi4], just like below:
[pi4] kernel=uboot_rpi_4.bin max_framebuffers=2 total_mem=3072
Then reboot, you could you the usb keyboard now, after installing the testing kernel, you could remove total_mem=3072.
And another way to login is to use ssh.
@reply #21,
The simplest workaround is to plug the sd card into a cardreader and connect the cardreader to computer, then edit $mount_ folder/ system- boot/config. txt
Add total_mem=3072 in the section [pi4], just like below:
[pi4] uboot_rpi_ 4.bin
kernel=
max_framebuffers=2
total_mem=3072
Then reboot, you could you the usb keyboard now, after installing the testing kernel, you could remove total_mem=3072.
And another way to login is to use ssh.