August 10, 20214 yr I'm trying to passthrough a GTX 550 Ti to my Windows 10 VM, which was previously installed using OVFM BIOS, UEFI boot mode, GPT partition. I was using a Radeon HD 6450 passed through. After attempting to pass through the card unsuccessfully for a few hours, i realized that the new card will not operate properly on a system that does not support Legacy mode (when i put it in my other system to RIP the vBIOS, i had to enable legacy mode before it would boot with that card in at all). My question is, is there a way to either enable Legacy/CSM mode in OVFM, or else enable UEFI mode in SeaBIOS?
August 11, 20214 yr 19 hours ago, CmdrKeen said: is there a way to either enable Legacy/CSM mode in OVFM, or else enable UEFI mode in SeaBIOS? No, it's not possible: ovmf boots uefi, seabios boots legacy, that's all; you need to convert your uefi installation to legacy. I never tried from uefi to legacy, only legacy to uefi, microsoft has an utility for this and it's straight forward. Try to search in internet, I saw some links pointing to some instructions, so this should be feasible. Make backups first!
August 11, 20214 yr Author 3 hours ago, ghost82 said: No, it's not possible: ovmf boots uefi, seabios boots legacy, that's all; you need to convert your uefi installation to legacy. I never tried from uefi to legacy, only legacy to uefi, microsoft has an utility for this and it's straight forward. Try to search in internet, I saw some links pointing to some instructions, so this should be feasible. Make backups first! Microsoft's utility only goes Legacy -> UEFI, it does not go the other way. I will need to create a new VM then. Thank you for the info. I will back up my data and start from scratch. Edited August 11, 20214 yr by CmdrKeen
August 11, 20214 yr 2 hours ago, CmdrKeen said: Microsoft's utility only goes Legacy -> UEFI, it does not go the other way. Yes, correct 2 hours ago, CmdrKeen said: I will need to create a new VM then This is not enough, since you have a uefi image and you want it legacy, so first you need to convert the disk or image from uefi to legacy, then you can create the vm.
August 11, 20214 yr Author 1 hour ago, ghost82 said: This is not enough, since you have a uefi image and you want it legacy, so first you need to convert the disk or image from uefi to legacy, then you can create the vm. I was going to create a new vdisk for the new VM. I don't tend to re-use vdisks.
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