The market is being flooded with Win10 netbooks, NAS, NUC-type devices that use eMMC. I suspect this is due to the eMMC being filled with multiple backups from Microsofts' update process and being returned for failure to update. The devices are relatively cheap. Leveno, Acer, Asus and HP all are producing eMMC netbooks.
FreeBSD has committed some code in the upcoming release that allows recognition of the storage. https://github.com/freebsd/freebsd/blob/ed7adc5aa801e5a1891b499776bef996b8d0242f/sys/dev/sdhci/sdhci_acpi.c#L76-L82 The eMMC storage is not seen by the bsd.rd installer but is seen by bsd.sp/bsd.mp I'm running Arch linux on mine after the OpenBSD installer failed to find the eMMC drive. My results were identical to this prior report. http://openbsd-archive.7691.n7.nabble.com/Need-help-installing-6-3-to-Acer-Aspire-with-eMMC-drive-sdmmc-troubles-td352781.html Is there interest in installing/booting OpenBSD on eMMC? -- J. Scott Heppler