Difference between revisions of "APF6 EMMC"
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{| border="1" cellpadding="10" cellspacing="0" summary="APF6 eMMC partitions" | {| border="1" cellpadding="10" cellspacing="0" summary="APF6 eMMC partitions" | ||
|---------------- | |---------------- | ||
| − | | style="width: | + | | style="width:10px;background:white;color:black;" align="center" | . |
| − | | style="width: | + | | style="width:40px;background:orange;color:white;" align="center" | SPL |
| − | | style="width: | + | | style="width:150px;background:orange;color:white;" align="center" | IMG |
| style="width:100px;background:white;color:black;" align="center" | ... | | style="width:100px;background:white;color:black;" align="center" | ... | ||
| − | | style="width: | + | | style="width:30px;background:orange;color:white;" align="center" | ENV1 |
| style="width:150px;background:white;color:black;" align="center" | ... | | style="width:150px;background:white;color:black;" align="center" | ... | ||
| − | | style="width: | + | | style="width:30px;background:orange;color:white;" align="center" | ENV2 |
| style="width:150px;background:white;color:black;" align="center" | ... | | style="width:150px;background:white;color:black;" align="center" | ... | ||
|} | |} | ||
| Line 44: | Line 44: | ||
! Offset (blocks) || Offset (bytes) || Size (bytes) || Comment | ! Offset (blocks) || Offset (bytes) || Size (bytes) || Comment | ||
|---------------- | |---------------- | ||
| − | |0 || 0 || 1 KB (0x400) || | + | |0 || 0 || 1 KB (0x400) || Free |
|---------------- | |---------------- | ||
| − | |0x02 || 1 KB (0x400)|| || U-Boot SPL (apf6-u-boot.spl) | + | |0x02 || 1 KB (0x400) || 68 KB || U-Boot SPL (apf6-u-boot.spl) |
|---------------- | |---------------- | ||
| − | |0x8a || 69 KB || || U-Boot IMG (apf6-u-boot.img) | + | |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 | |0x800 (2048) || 1024 KB (0x100000) || 10 KB (0x2800) || U-Boot environment | ||
| + | |---------------- | ||
| + | ||| || || Free | ||
|---------------- | |---------------- | ||
|0xc00 (3072) || 1536 KB (0x180000) || 10 KB (0x2800) || Redundant U-Boot environment | |0xc00 (3072) || 1536 KB (0x180000) || 10 KB (0x2800) || Redundant U-Boot environment | ||
| + | |---------------- | ||
| + | ||| || || Free | ||
|---------------- | |---------------- | ||
|} | |} | ||
Revision as of 15:25, 18 February 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 (blocks) | Size | Comment |
|---|---|---|---|---|---|
| ... | NA | NA | 0 | 1 MBytes (2048 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) |
| Rootfs | mmc 0:2 | /dev/mmcblk2p2 | (0x18800) | Rest of space (<3816448 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 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.
