Unable to dump my video card vBIOS

[mspzyzh]

I use Intel igpu
According to the document
https://pve.proxmox.com/wiki/Pci_passthrough
To this step
"cd /sys/bus/pci/devices/0000:00:02.0"
"echo 1 > rom"
Display "-bash: rom: Permission denied"

 

[ldw300]

I know this is an old post but did you find a solution? I have the exact same issue.

(EDIT) I found the issue. There's a permission error that is cause by the root user not having execute permissions .

simple fix is when you are in the device directory (e.g. /sys/bus/pci/devices/0000:00:02.0), type

ls -l rom

The output will probably resemble something like this

-rw------- 1 root root 131072 Jan 20 23:15 rom

To fix the permission error within the directory enter

chmod u+x rom

This gives the root user permissions to execute in this folder.

ls -l rom

-rwx------ 1 root root 131072 Jan 20 23:29 rom

Then you can perform the cat and echo commands without permission error to dump the rom.

Hope this helps!

 

[leesteken]

Also make sure to boot with another GPU, otherwise you might get a partially initialized ROM which is not what you want for PCI(e) passthrough.

 

[ldw300]

Also make sure to boot with another GPU, otherwise you might get a partially initialized ROM which is not what you want for PCI(e) passthrough.

I believe this is the issue I am running into at the moment, because the MacOS VM deadstops halfway through the boot screen. Disable the pci device and VM works normally. I have just decided to put it off until I get a secondary GPU in the system. But booting MacOS as a VM is an entirely difficult process as it is.