Kernel accesses C: even if booted from A:

[boeckmann]

It should be investigated where the access originates from, because if booted from drive A:, there is no obvious reason why it should access C:

[boeckmann]

This originates most likely from: https://github.com/SvarDOS/edrdos/blob/1b985bd5a62500da51c24e3790d2d64eb9567f31/drbio/genercfg.asm#L148-L158