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Black screen after GRUB TinyCorePure64-12.0

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Jip-Hop:
I flashed TinyCorePure64-12.0.iso to a USB stick and I'm trying to boot from it on my PC (Fujitsu D3644-B motherboard, CPU Intel G5420). This motherboard can only boot via UEFI (no legacy support). After the GRUB menu, I no longer get any output on the screen (it stays black). I've tried connecting the screen on all of the available ports (2x Display Port and 1x DVI). But this didn't make any difference.

I verified the boot completes successfully by adding the superuser boot code to the corew option in the GRUB menu. I wait a little while, looking at the black screen, and then enter poweroff with the keyboard. The PC now powers off. So I know the system has booted successfully, I just don't get any display output.

The display, cable and ports work obviously. I can boot with an Ubuntu ISO without issues.

I also tried a couple of different values for vga=7xx but without effect. Any idea how I could debug this?

Rich:
Hi Jip-Hop
A search turned up this possibility:

--- Quote ---This turned out to be a hidden BIOS option that needed to be disabled on the Fujitsu 3644-B motherboard. Go into PCI settings and disable "Above 4G decoding" and it works like expected.

--- End quote ---

Jip-Hop:
Holy smokes that worked! Thanks :)

Rich:
Hi Jip-Hop
You are welcome. Thank you for confirming it worked. :)

Jip-Hop:
I'm curious as to why Above 4G decoding needs to be disabled for TinyCorePure64. Do you have an idea? I didn't need to disable it for Ubuntu for example. Is there a way to make TinyCorePure64 work with Above 4G decoding?

I don't think I need it myself but my project is based on TinyCorePure64: https://github.com/Jip-Hop/sedunlocksrv-pba. Maybe others will need it.

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