8GB eMMC unrecognized?

Banana Pi Router design BPI-R3/R3 Mini(MT7986)
1

Even the BPI-R3 is set as NAND boot, I remember it should be able to recognize the eMMC device by default (?)

Once after flashing the SD card with official 2022-12-18-ubuntu-22.04-server-bpi-r3-aarch64-sd-emmc.img, it booted as expected with SD card:

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However, then I switch it back to NAND boot, the eMMC became unrecognizable. Does anyone have experience on this?

The NAND boot:

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Thanks, Bruce

2

R3 uses more switches so you have to make sure not only the boot switches are right but also the device ones.

See

https://www.fw-web.de/dokuwiki/doku.php?id=en:bpi-r3:uboot#bootmedium_selection

Sw6/D has to be in the right position.