Hello all.
I have different experience. Once it did not work at all. The other time it worked somewhat
I did more accurate testing.
menuconfig: default +ASRock +E350M1 +Use VGA BIOS payload: SeaBIOS system: Windows 8 and Trisquel 6.0 dual-boot with GRUB2 snapshot: cb891de
Native PS/2 keyboard BTC 5211 GRUB: Works as fine as possible to test in GRUB Win8: Not working Trisquel6: Not working (during POST leds blink, even CONFIG_DRIVERS_PS2_KEYBOARD is not set)
Native PS/2 mouse Logitech M-SBF90 GRUB: N/A Win8: Not working Trisquel6: Not working
Dual USB-PS/2 capable mouse Logitech M-BT58 with PS/2 adaptor GRUB: N/A Win8: Not working Trisquel6: Works fine
Hope my information will help make coreboot better. Or may be just usable to update wiki :)
Cheers!