Remarks
Everything works fine. Applied Intel ME Cleaner. Suspend works. Cheap, powerful mini desktop with PS/2 mouse+keyboard 
I love it.
Added USB 3.0 pcie express card, cheap one with via chip.
If anyone is interested, i can make a coreboot build “tutorial”.
Attachments
Qubes-HCL-HP-HP_Compaq_8200_Elite_SFF_PC-20211023-203118.yml (926 Bytes)