fdisk -l /dev/mmcblk*

Disk /dev/mmcblk1: 29.83 GiB, 32026656768 bytes, 62552064 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x2f494653

Device         Boot Start      End  Sectors  Size Id Type
/dev/mmcblk1p1       8192 62552063 62543872 29.8G  c W95 FAT32 (LBA)


Disk /dev/mmcblk1p1: 29.82 GiB, 32022462464 bytes, 62543872 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x00000000


Disk /dev/mmcblk3: 7.28 GiB, 7818182656 bytes, 15269888 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x0cc66cc0

Device         Boot Start      End  Sectors  Size Id Type
/dev/mmcblk3p1       2048    32767    30720   15M  c W95 FAT32 (LBA)
/dev/mmcblk3p2      32768 15269887 15237120  7.3G 83 Linux


Disk /dev/mmcblk3boot0: 8 MiB, 8388608 bytes, 16384 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mmcblk3boot1: 8 MiB, 8388608 bytes, 16384 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mmcblk3p1: 15 MiB, 15728640 bytes, 30720 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x00000000


Disk /dev/mmcblk3p2: 7.27 GiB, 7801405440 bytes, 15237120 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
fdisk: cannot open /dev/mmcblk3rpmb: Illegal seek