Banana Pi BPI R4 Pro - when Boot from eMMC, can I use microSD as a storage device?

Banana Pi Router design BPI-R4/BPI-R4 Pro(MT7988)
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question as title.

THANKS :slight_smile:

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R3 and R4(pro) have only 1 mmc controller and so only one of these 2 can be used at one time based on boot switch. There was a try to map sdcard as spi device via spi pins and some kind of mmc controller emulation but had not got this working.

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thanks frank. I just found that that I can attach NVMe SSD cards at the back of the board… so problem solved :slight_smile: