Offset calculation for solo BIOS region is wrong.

[werwurm]

return consts.BasePhysAddr - addr, nil

This calculates the offset from the end of the image, but what we need is the offset from the beginning of the image.

return <image size likely 16MB> - (consts.BasePhysAddr - addr), nil

I hard coded this to 16MB (0x1000000) for my image and it worked like a charm. The real fix probably needs to use the actual image size.

This is how the problem manifested, just in case someone is searching for this issue:

bg-prov: error: new ACM size doesn't equal old ACM size

https://github.com/9elements/converged-security-suite/blob/5f384405a351d7813e1bfdc34b5ed74ba4540b05/pkg/tools/ifd.go#L49