[coreboot] Questions about ASRock H110M-DVS

Hi all,

I read on Coreboot webpage that this board is in almost full working state https://doc.coreboot.org/mainboard/asrock/h110m-dvs.html .

The CPU supported by this board is Kaby Lake which is quite fast for applications. I have a question about the flash chip. The documentation says the flash chip is Macronix MX25L6473E, but is putting in w25q64fvaig flash chip will work too?  What about other similar chips, such as GD25B64BPIG?

Also, for this board, there are a few variants Asrock Intel H110M-DGS, -DVS, and -HDV.  Can I use -DGS for this board?

In the documentation, integrated graphics init with libgfxinit (see Known issues) , and VGA is not working.  In summary integrated graphics not working, but if I put on a PCIe graphic card, coreboot will work?

Also, for this line: I should fill in the actual macaddress 
./util/scripts/config --set-str REALTEK_8168_MACADDRESS "xx:xx:xx:xx:xx:xx"

For this line, what does this line do? make olddefconfig

Thank you so much,