Custom kernel hangs on boot, no error, no logs

I'm trying to compile QNAP's Linux 5.10 kernel because I need access to their proprietary file system. After fixing (too many) errors I managed to get it to build. However, when I try to but it, I just get a black screen with a flashing cursor. If I remove quiet from the command line, it shows a boot logo and a flashing cursor below it, but again, no prints whatsoever. Journalctl doesn't even acknowledge that the kernel even started to boot. I've also attempted to redirect the output to a serial console but that doesn't show anything either. Where do I even begin?