[coreboot] No external PCIe GPU possible/working on Gigabyte g41m-es2l

[i1w5d7gf38keg at tutanota.com]

Hardware: Gigabyte g41m-es2l, latest coreboot git, latest seabios git, two nvidia gpu cards tested

I tried to use some external GPU on a g41m-es2l to get some digial screen output. It does not seem to work. When having build coreboot with native vga-init for the internal intel gpu, i never get a output from the nvidia card. When i connect the analog VGA cable to the internal intel gpu and boot up i can see many nouveau (memory-space?) errors. Both GPUs (nvidia and intel) are then enabled at once. Kernel 4.10 cant boot.

I tried removing the native vga-init. The only change is then that the Intel GPU works only when the kernel have load. Nvidia card deliver still same errors.

With OEM-bios the intel card gets disabled and a PCIe GPU works fine.
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