https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210662

            Bug ID: 210662
           Summary: msdosfs(5) cannot mount the FAT12 fs on the BeagleBone
                    Black's eMMC image
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: [email protected]
          Reporter: [email protected]

The BeagleBone Black eMMC image contains a boot partition (type 0Ch) with a
FAT12 file system:

root@beaglebone:~ # file -s /dev/mmcsd0s1
/dev/mmcsd0s1: DOS/MBR boot sector, code offset 0x3c+2, OEM-ID "BSD4.4  ", root
entries 512, sectors 4095 (volumes <=32 MB) , sectors/FAT 12, sectors/track 63,
heads 255, serial number 0x5de21501, label: "MSDOSBOOT  ", FAT (12 bit),
followed by FAT

But FreeBSD's msdosfs cannot mount it:

root@beaglebone:~ # mount -t msdosfs /dev/mmcsd0s1 /mnt
mount_msdosfs: /dev/mmcsd0s1: Operation not permitted

Tested on 11.0-ALPHA4 SD card image:

root@beaglebone:~ # uname -a
FreeBSD beaglebone 11.0-ALPHA4 FreeBSD 11.0-ALPHA4 #0 r301975: Fri Jun 17
13:32:55 UTC 2016    
[email protected]:/usr/obj/arm.armv6/usr/src/sys/BEAGLEBONE  arm

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