Difference between revisions of "EMMC OPOS6UL"
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| style="width:50px;background:white;color:black;" align="center" | ... | | style="width:50px;background:white;color:black;" align="center" | ... | ||
− | | style="width:100px;background:green;color:white;" align="center" | Failsafe (primary) | + | | style="width:100px;background:green;color:white;" align="center" | Failsafe/Update (primary) |
− | | style="width:600px;background:green;color:white;" align="center" | Rootfs ( | + | | style="width:600px;background:green;color:white;" align="center" | Default Rootfs (primary) |
− | | style="width:600px;background:green;color:white;" align="center" | Home/Data ( | + | | style="width:600px;background:green;color:white;" align="center" | Home/Data (primary) |
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|MBR || NA || NA || 0 || 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 :-) ) | ||
|---------------- | |---------------- | ||
− | |Failsafe || mmc 0:1 || /dev/mmcblk0p1 || 1M || 2048 || 64MBytes (131072 sectors) || system/rootfs to restore your board in case of problem (ext4 formatted) | + | |Failsafe || mmc 0:1 || /dev/mmcblk0p1 || 1M || 2048 || 64MBytes (131072 sectors) || system/rootfs to restore your board in case of problem or setup a safe update mechanism (ext4 formatted) |
|---------------- | |---------------- | ||
− | |Rootfs || mmc 0:5 || /dev/mmcblk0p5 || || 135168 (0x21000) || 2GBytes (4194304 sectors) || the default rootfs is on this partition (ext4 formatted) | + | |Rootfs || mmc 0:5 || /dev/mmcblk0p5 || || 135168 (0x21000) || 2GBytes (4194304 sectors) || the default booted rootfs is on this partition (ext4 formatted) |
|---------------- | |---------------- | ||
|Home/Data || mmc 0:6 || /dev/mmcblk0p6 || || 4331520 (0x421800) || Rest of space: ~1,6GBytes (3303424 sectors) || HOME can be stored on this partition (ext4 formatted) | |Home/Data || mmc 0:6 || /dev/mmcblk0p6 || || 4331520 (0x421800) || Rest of space: ~1,6GBytes (3303424 sectors) || HOME can be stored on this partition (ext4 formatted) |
Revision as of 16:53, 6 October 2016
Contents
OPOS6UL eMMC layout
By default, the 4GB eMMC on OPOS6UL module has 4 physical/hardware partitions:
Boot0 | Boot1 | RPMB | User Data |
Name | U-Boot name | Size | Comment |
---|---|---|---|
boot0 | mmc dev 0 1 | 4MBytes | U-Boot is installed on this partition |
boot1 | mmc dev 0 2 | 4MBytes | Not used |
rpmb | mmc dev 0 3 | 512KBytes | Not used |
User Data | mmc dev 0 0 | remaining space (~3,7GBytes) | 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 |
Boot1 partition layout
- Not used !
RPMB partition layout
- Not used !
User Data partition layout
There are 3 partitions on the "User Data" physical partition:
... | Failsafe/Update (primary) | Default Rootfs (primary) | Home/Data (primary) |
Name | U-Boot device | Linux device | Offset (bytes) | Offset (sectors/blocs) | Size | Comment |
---|---|---|---|---|---|---|
MBR | NA | NA | 0 | 0 | 512 bytes (1 block) | Master Boot Record. (Don't touch it :-) ) |
Failsafe | mmc 0:1 | /dev/mmcblk0p1 | 1M | 2048 | 64MBytes (131072 sectors) | system/rootfs to restore your board in case of problem or setup a safe update mechanism (ext4 formatted) |
Rootfs | mmc 0:5 | /dev/mmcblk0p5 | 135168 (0x21000) | 2GBytes (4194304 sectors) | the default booted rootfs is on this partition (ext4 formatted) | |
Home/Data | mmc 0:6 | /dev/mmcblk0p6 | 4331520 (0x421800) | Rest of space: ~1,6GBytes (3303424 sectors) | HOME can be stored 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/mmcblk0p5 # 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.
Tips
- Commands to partition User Data from fdisk on Host PC with U-Boot UMS. Check /dev/sdc is your OPOS6UL device otherwise you may destroy your PC partition table !!!:
$ sudo fdisk /dev/sdc n p 1 2048 +64M n e 2 133120 7634943 n l 135168 +2G n 4331520 7634943 w