How to Boot GRUB2 from the laptop inteal SD card?

I have a SD card that contain my custom Linux that could be booted from the USBCardReader right and without any issue BUT I want to boot my SD card from the laptop inteal SD card reader and when I inserted it my BIOS did not detected it as bootable device. However I have installed GRUB2 in my HDD and when I started by GRUB2 I run GRUB2 command prompt by clicking [c] then I run [ls] command and I did not see any hd1 or mmcxxxxx device? How can I boot from my laptop inteal SD card reader? Is that I must switch to PLOP boot manager or GRUB2 can useful for me? Regards.

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