EMMC OPOS93: Difference between revisions
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SebastienSz (talk | contribs) Created page with "Category: eMMC = OPOS93 eMMC layout = By default, the 8GB eMMC on OPOS93 module has 4 physical/hardware partitions: {| border="1" cellpadding="10" cellspacing="0" summary="OPOS93 eMMC partitions" |---------------- | style="width:80px;background:orange;" align="center" | Boot0 | style="width:80px;background:orange;" align="center" | Boot1 | style="background:red;" | RPMB | style="width:500px;background:green;color:white;" align="center" | User Data |} {| bord..." |
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| style="width: | | style="width:150px;background:orange;color:white;" align="center" | opos93-u-boot.bin | ||
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Revision as of 15:23, 30 January 2026
OPOS93 eMMC layout
By default, the 8GB eMMC on OPOS93 module has 4 physical/hardware partitions:
| Boot0 | Boot1 | RPMB | User Data |
| Name | U-Boot name | Size | Comment |
|---|---|---|---|
| boot0 | mmc dev 0 1 | 4 MBytes | U-Boot is installed on this partition |
| boot1 | mmc dev 0 2 | 4 MBytes | U-Boot env is installed on this partition |
| rpmb | mmc dev 0 3 | 4 MBytes | Not used |
| User Data | mmc dev 0 0 | remaining space (~7,3 GBytes) | Kernel, device tree and rootfs |
Boot0 partition layout
| opos93-u-boot.bin | ... |
- Linux device: /dev/mmcblk0boot0
| Offset (blocks) | Offset (bytes) | Size (bytes) | Comment |
|---|---|---|---|
| 0 | 0 | 1.3 MiB | Boot image (opos93-u-boot.bin) containing U-Boot, ATF, etc... |
| Free |
Boot1 partition layout
| U-Boot env | ... | U-Boot redundant env | ... |
- Linux device: /dev/mmcblk0boot1
| Offset (blocks) | Offset (bytes) | Size (bytes) | Comment |
|---|---|---|---|
| 0 | 0 | 128 KiB | U-Boot environment |
| 256 | 128 KiB | 128 KiB | U-Boot redundant environment |
| Free |
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 + some spare space ( -> Don't touch it :-) ) |
| Failsafe | mmc 0:1 | /dev/mmcblk0p1 | 1M | 2048 (0x800) | 512 MBytes (1048576 sectors) | system/rootfs to restore your board in case of problem or setup a safe update mechanism (ext4 formatted) |
| Rootfs | mmc 0:2 | /dev/mmcblk0p2 | 1050624 (0x10800) | 512 MBytes (1048576 sectors) | the default booted rootfs is on this partition (ext4 formatted) | |
| Home/Data | mmc 0:3 | /dev/mmcblk0p3 | 2099200 (0x200800) | Rest of space: ~6,3 GBytes (13208542 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/mmcblk0p2 # 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 the eMMC of your OPOS93 device otherwise you may destroy your PC partition table !!!:
$ sudo echo -e 'size=512MiB,type=0x83\nsize=512MiB,type=0x83\ntype=0x83' | sfdisk /dev/sdc $ sudo mkfs.ext4 -O ^64bit,^metadata_csum,uninit_bg /dev/sdc1 $ sudo mkfs.ext4 -O ^64bit,^metadata_csum,uninit_bg /dev/sdc2 $ sudo mkfs.ext4 -O ^64bit,^metadata_csum,uninit_bg /dev/sdc3
