Boot from internal SD card reader?

[leyove8203]

Hey, I'm wondering is it possible to boot from an SD card reader built into my laptop, it seems Plop can't recognise it even though it works when using a USB-to-SD adapter. I am aware PlopKexec supports internal SD however it appears it can't be put on MBR or BIOS?
Having another USB plugged in just to boot from SD reader would essentially defeat the purpose, is there any workaround for it? Thank you!