you may need to alter the HDMI values in the config.txt file.
you should be able to read the file system. It will ask to mount, mount it and examine the card. Boot your pi4 from a known good working distribution like Raspbian Buster, once your system is up to the desktop, insert the usb card reader into a usb port on the pi4. Try loading the microsd card with the Pimiga image on it, into a usb cardreader. You may have to define a hotkey in Amiberry to quit to the shell.
I booted my pi3 with a copy of Raspbian Buster, and put the Pimiga microsd into a usb card reader and plugged it into the usb bus on the Pi3, it asked to mount, and I said okay and then just navigate to the root of the card you should see cmdline.txt.Įdit it, save it, shutdown, put the Pimiga card back into the pi3 microsd slot and boot it up. Leave it as single line, the kernel wants it to be a single line so it can be parsed properly.Įasiest way. When you edit the file, you will see it is all on one line even though there are 6 or 7 parameters available, making it a bit difficult to read like a giant runon sentence. You can edit the file and change the value - I made mine consoleblank=361 which gives me 5 minutes before it blanks. There is a file called cmdline.txt that passes parameters to the kernel, the author set the consoleblank=1 setting so that it is pretty much always blank if you try to use the terminal.