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A comment on I've now played with a Raspberry Pi 400 for a week and here are my conclusions. Parent comment

Re:I've now played with a Raspberry Pi 400 for a week and he... by fest on Friday November 20, 2020 @01:32PM (#25163344)
The physical layer for eMMC is SDIO- the same is used for SD cards, at least if you want more than ~ a megabyte/s of interface bandwidth.

IIRC the layers above SDIO are slightly different for eMMC and SD(HC), but generally SoCs that have SDIO interface support both types of memory.

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