Difference between revisions of "APF6 EMMC"
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{| border="1" cellpadding="5" cellspacing="0" summary="APF6 eMMC User data partitions details" | {| border="1" cellpadding="5" cellspacing="0" summary="APF6 eMMC User data partitions details" | ||
|- style="background:#efefef;" align="center" | |- style="background:#efefef;" align="center" | ||
| − | !Name || U-Boot device || Linux device || Offset (blocks) || Size || Comment | + | !Name || U-Boot device || Linux device || Offset (bytes) || Offset (blocks) || Size || Comment |
|---------------- | |---------------- | ||
| − | |MBR || NA || NA || 0 || 512 bytes (1 block) || Master Boot Record. (Don't touch it :-) ) | + | |MBR || NA || NA || 0 || 0 || 512 bytes (1 block) || Master Boot Record. (Don't touch it :-) ) |
|---------------- | |---------------- | ||
| − | |... || NA || NA || 1 || ~1 MBytes (2047 blocks) || Free | + | |... || NA || NA || 512 || 1 || ~1 MBytes (2047 blocks) || Free |
|---------------- | |---------------- | ||
| − | |Boot || mmc 0:1 || /dev/mmcblk2p1 || 2048 (0x800) || 24 MBytes (49152 blocks) || The kernel and the device tree (inside a ''dtbs/'' directory) are on this partition (ext4 formatted) | + | |Boot || mmc 0:1 || /dev/mmcblk2p1 || 1M (0x100000) || 2048 (0x800) || 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 || 51200 (0xc800) || Rest of space (< 7682048 blocks) || the rootfs is on this partition (ext4 formatted) | + | |Rootfs || mmc 0:2 || /dev/mmcblk2p2 || 25M (0x1900000)|| 51200 (0xc800) || Rest of space (< 7682048 blocks) || the rootfs is on this partition (ext4 formatted) |
|---------------- | |---------------- | ||
|} | |} | ||
Revision as of 15:27, 31 July 2015
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
| . | SPL | IMG | ... | ENV1 | ... | ENV2 | ... |
- Linux device: /dev/mmcblk2boot0
| Offset (blocks) | Offset (bytes) | Size (bytes) | Comment |
|---|---|---|---|
| 0 | 0 | 1 KB (0x400) | Free |
| 0x02 | 1 KB (0x400) | 68 KB | U-Boot SPL (apf6-u-boot.spl) |
| 0x8a | 69 KB (0x11400) | 512 KB | U-Boot IMG (apf6-u-boot.img) |
| Free | |||
| 0x800 (2048) | 1024 KB (0x100000) | 10 KB (0x2800) | U-Boot environment |
| Free | |||
| 0xc00 (3072) | 1536 KB (0x180000) | 10 KB (0x2800) | Redundant U-Boot environment |
| Free |
User Data partition layout
There are two primary partitions on the "User Data" physical partition:
| ... | Boot | Rootfs |
| Name | U-Boot device | Linux device | Offset (bytes) | Offset (blocks) | Size | Comment |
|---|---|---|---|---|---|---|
| MBR | NA | NA | 0 | 0 | 512 bytes (1 block) | Master Boot Record. (Don't touch it :-) ) |
| ... | NA | NA | 512 | 1 | ~1 MBytes (2047 blocks) | Free |
| Boot | mmc 0:1 | /dev/mmcblk2p1 | 1M (0x100000) | 2048 (0x800) | 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 | 25M (0x1900000) | 51200 (0xc800) | Rest of space (< 7682048 blocks) | the rootfs is on this partition (ext4 formatted) |
- By default rootfs is only occupying the size of the .ext4 image flashed with U-Boot. If you want to increase the rootfs to all available free space then, after Linux has booted, use the following command:
# resize2fs /dev/mmcblk2p2
Rootfs will then be extended to all the "Rootfs" eMMC partition space.
