Vendein_RaZoR wrote on 2025-08-06, 15:06:

Does anyone knows what kind of peripheral modules can be used on LPC bus ?
I saw Intel's LPC specification and there is no video adapters in list, only FDC, FWH, COM, LPT and others
But maybe I'm not right and can be any chances to work (ISA) videocard on LPC bus?

Accoring to WikiPedia (which is always coprrect ...)

Device discovery is not supported; since only motherboard devices or specific models of TPM are connected, the host firmware (BIOS, UEFI) image will include a static description of any devices and their I/O addresses expected to be present on a particular motherboard

So unlikely. But I'm not really that much into understanding busses to say "no".

I mean, if you have some other way to shoe on an isa option rom to supply the vga bios, then the discovery would just be the bios post process doing the adapter rom region scan, it finding the vga opt rom, then executing it.

The option rom startup code would then set up and turn on the card.

This option rom needs to be directly in the mapped 1mb memory area though.

Maybe shoehorned onto the packed system rom?

nfraser01 wrote on 2025-08-06, 17:28:

Device discovery is not supported; since only motherboard devices or specific models of TPM are connected, the host firmware (BIOS, UEFI) image will include a static description of any devices and their I/O addresses expected to be present on a particular motherboard

So unlikely. But I'm not really that much into understanding busses to say "no".

Did wikipedia mean that legacy PnP not supported ? UEFI configures preset base addresses, like for LPT or COM ?
Does anyone know something about support Option ROM by UEFI on LPC in CSM mode ?

ISA cards do not have to be plug & play, but means you have to set the IRQ, I/O, DMA manually, and/or force the driver to install. They don't need a VGA BIOS if only used in windows, but won't show anything on the screen until it's at least been setup as a generic display adapter. I believe the VGA cards BIOS image contains the device ID windows would use to be plug and play such as 'PNP0914'.

UEFI BIOS's would be setup to block any unrecognised/unapproved devices IMO.