APF6 EMMC

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Revision as of 18:37, 3 January 2015 by JulienB (Talk | contribs) (Boot0 partition layout)

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APF6 eMMC layout

By default, the 4GB eMMC on APF6 board has 4 physical/hardware partitions:

Boot0 Boot1 RPMB User Data


Name U-Boot name Size Comment
boot0 mmc dev 0 1 2MBytes U-Boot is installed on this partition
boot1 mmc dev 0 2 2MBytes Not used
rpmb mmc dev 0 3 512KBytes Not used
User Data mmc dev 0 0 remaining space Kernel, device tree and rootfs

Boot0 partition layout

Offset (blocks) Offset (bytes) Comment
0 0
0x02 1 KB U-Boot SPL (apf6-u-boot.spl)
0x8a 69 KB U-Boot IMG (apf6-u-boot.img)
512 KB
1024 KB U-Boot environment
1536 KB Redundant U-Boot environment

User Data partition layout

There are two primary partitions on the "User Data" physical partition:

Boot Rootfs


Name U-Boot device Linux device Size Comment
Boot mmc 0:1 /dev/mmcblk2p1 24 MBytes (49152 blocks) The kernel and the device tree (inside a dtbs/ directory) are on this partition (ext4 formatted)
Rootfs mmc 0:2 /dev/mmcblk2p2 Rest of space (<3816448 blocks) the rootfs is on this partition (ext4 formatted)

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