Hi,
On 31.10.19 09:48, dalao@tutanota.com wrote:
After I press the power button, the screen is black, untill 30 seconds or maybe even longer I can see the screen light up. (I guess it's waiting at the grub menu but I can't see it)
if Tianocore doesn't show anything, it's the Linux graphics driver that initializes the display first. So you probably built coreboot without any UEFI-compatible means of graphics initialization.
Bootloaders like GRUB don't know how to initialize graphics, so trying different Linux distributions seems futile. Here is what I would try: Find a second PC that boots in UEFI mode. Boot your Live-Linux on it, and add the `iomem=relaxed` in the GRUB menu. Note any keys you have to press or do it in parallel on both machines; so enter everything on your black-screen blindly and hope. Stupid procedure, but worth one shot at least before you waste more time trying to adapt boot media.
Hope that helps, Nico