Difference between revisions of "APF6 EMMC"
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| + | [[Category: eMMC]] | ||
= APF6 eMMC layout = | = APF6 eMMC layout = | ||
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|... || NA || NA || 512 || 1 || ~1 MBytes (2047 blocks) || Free | |... || NA || NA || 512 || 1 || ~1 MBytes (2047 blocks) || Free | ||
|---------------- | |---------------- | ||
| − | |Boot || mmc 0:1 || /dev/mmcblk2p1 || 1M (0x100000) || 2048 (0x800) || | + | |Boot || mmc 0:1 || /dev/mmcblk2p1 || 1M (0x100000) || 2048 (0x800) || 48 MBytes (98304 blocks) || The kernel and the device tree (inside a ''dtbs/'' directory) are on this partition (ext4 formatted) |
|---------------- | |---------------- | ||
| − | |Rootfs || mmc 0:2 || /dev/mmcblk2p2 || | + | |Rootfs || mmc 0:2 || /dev/mmcblk2p2 || 49M (0x3100000)|| 100352 (0x18800) || Rest of space (< 7632896 blocks) || the rootfs is on this partition (ext4 formatted) |
|---------------- | |---------------- | ||
|} | |} | ||
| − | * By default rootfs | + | * By default, when flashed from U-Boot, rootfs and boot are only occupying the size of the .ext4 images used during flashing. If you want to increase the rootfs/boot size to all available free space then, after Linux has booted, use the following commands: |
<pre class="apf"> | <pre class="apf"> | ||
| − | # resize2fs /dev/mmcblk2p2 | + | # resize2fs /dev/mmcblk2p1 # for Boot |
| + | # resize2fs /dev/mmcblk2p2 # for Rootfs | ||
</pre> | </pre> | ||
| − | Rootfs will then be extended to all the "Rootfs" eMMC | + | |
| + | * Or with apf-config command | ||
| + | <pre class="apf"> | ||
| + | # apf-config | ||
| + | </pre> | ||
| + | * in menu: | ||
| + | <pre class="config"> | ||
| + | | 1 Expand Filesystem(s) OS can then use all eMMC/SD space | | ||
| + | </pre> | ||
| + | |||
| + | |||
| + | Rootfs/Boot will then be extended to all the "Rootfs"/"Boot" eMMC partitions space. | ||
==Links== | ==Links== | ||
* [http://fr.slideshare.net/linaroorg/intro-to-emmc http://fr.slideshare.net/linaroorg/intro-to-emmc] | * [http://fr.slideshare.net/linaroorg/intro-to-emmc http://fr.slideshare.net/linaroorg/intro-to-emmc] | ||
* https://fr.wikipedia.org/wiki/Master_boot_record ou http://poloastucien.free.fr/mbr_fat_secteurs_boot_h.html | * https://fr.wikipedia.org/wiki/Master_boot_record ou http://poloastucien.free.fr/mbr_fat_secteurs_boot_h.html | ||
Revision as of 15:36, 21 June 2017
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) | 48 MBytes (98304 blocks) | The kernel and the device tree (inside a dtbs/ directory) are on this partition (ext4 formatted) |
| Rootfs | mmc 0:2 | /dev/mmcblk2p2 | 49M (0x3100000) | 100352 (0x18800) | Rest of space (< 7632896 blocks) | the rootfs is on this partition (ext4 formatted) |
- By default, when flashed from U-Boot, rootfs and boot are only occupying the size of the .ext4 images used during flashing. If you want to increase the rootfs/boot size to all available free space then, after Linux has booted, use the following commands:
# resize2fs /dev/mmcblk2p1 # for Boot # resize2fs /dev/mmcblk2p2 # for Rootfs
- Or with apf-config command
# apf-config
- in menu:
| 1 Expand Filesystem(s) OS can then use all eMMC/SD space |
Rootfs/Boot will then be extended to all the "Rootfs"/"Boot" eMMC partitions space.
