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Many eMMC devices have separate boot partitions that aren't part of the normal partition table that show up as /dev/mmcblk[0-9]boot[0-9]. These partitions are generally small (128KB to 16MB) and typically hold a boot loader, boot loader data or a recovery image. Match these and create -boot%n by-path symlinks. Prior to this change by-path symlinks for the main device would be incorrectly linked to one of the boot partitions. For instance before: /dev/disk/by-path/platform-219c000.usdhc linked to /dev/mmcblk1boot1 Now: /dev/disk/by-path/platform-219c000.usdhc links to /dev/mmcblk1 /dev/disk/by-path/platform-219c000.usdhc-boot0 links to /dev/mmcblk1boot0 /dev/disk/by-path/platform-219c000.usdhc-boot1 links to /dev/mmcblk1boot1 On systems that support multiple SD/MMC devices it can be essential to have by-path links to these devices since device names vary depending on which other devices are connected.