Difference between revisions of "APF6 EMMC"
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+ | [[Category: eMMC]] | ||
= APF6 eMMC layout = | = APF6 eMMC layout = | ||
− | By default, the 4GB eMMC on APF6 board has 4 physical partitions | + | By default, the 4GB eMMC on APF6 board has 4 physical/hardware partitions: |
− | {| border="1" cellpadding=" | + | {| border="1" cellpadding="10" cellspacing="0" summary="APF6 eMMC partitions" |
|---------------- | |---------------- | ||
− | !Name || Size || Comment | + | | 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 | ||
+ | |} | ||
+ | |||
+ | |||
+ | {| border="1" cellpadding="5" cellspacing="0" summary="APF6 eMMC partitions details" | ||
+ | |- style="background:#efefef;" align="center" | ||
+ | !Name || U-Boot name || Size || Comment | ||
|---------------- | |---------------- | ||
− | |boot0 || | + | |boot0 || mmc dev 0 1 || 2MBytes || U-Boot is installed on this partition |
|---------------- | |---------------- | ||
− | |boot1 || | + | |boot1 || mmc dev 0 2 || 2MBytes || Not used |
|---------------- | |---------------- | ||
− | |rpmb || | + | |rpmb || mmc dev 0 3 || 512KBytes || Not used |
|---------------- | |---------------- | ||
− | |User Data || remaining space || Kernel, device tree and rootfs | + | |User Data || mmc dev 0 0 || remaining space || Kernel, device tree and rootfs |
|---------------- | |---------------- | ||
|} | |} | ||
− | |||
== Boot0 partition layout == | == Boot0 partition layout == | ||
+ | {| border="1" cellpadding="10" cellspacing="0" summary="APF6 eMMC partitions" | ||
+ | |---------------- | ||
+ | | style="width:10px;background:white;color:black;" align="center" | . | ||
+ | | style="width:40px;background:orange;color:white;" align="center" | SPL | ||
+ | | style="width:150px;background:orange;color:white;" align="center" | IMG | ||
+ | | style="width:100px;background:white;color:black;" align="center" | ... | ||
+ | | style="width:30px;background:orange;color:white;" align="center" | ENV1 | ||
+ | | style="width:150px;background:white;color:black;" align="center" | ... | ||
+ | | style="width:30px;background:orange;color:white;" align="center" | ENV2 | ||
+ | | style="width:150px;background:white;color:black;" align="center" | ... | ||
+ | |} | ||
+ | |||
+ | * Linux device: ''/dev/mmcblk2boot0'' | ||
{| border="1" cellpadding="5" cellspacing="0" summary="Functionnalities test results" | {| border="1" cellpadding="5" cellspacing="0" summary="Functionnalities test results" | ||
+ | |- style="background:#efefef;" align="center" | ||
+ | ! 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: | ||
+ | {| border="1" cellpadding="10" cellspacing="0" summary="APF6 eMMC partitions" | ||
+ | |---------------- | ||
+ | | style="width:50px;background:white;color:black;" align="center" | ... | ||
+ | | style="width:100px;background:green;color:white;" align="center" | Boot | ||
+ | | style="width:600px;background:green;color:white;" align="center" | Rootfs | ||
+ | |} | ||
+ | |||
+ | |||
+ | {| border="1" cellpadding="5" cellspacing="0" summary="APF6 eMMC User data partitions details" | ||
+ | |- style="background:#efefef;" align="center" | ||
+ | !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: | ||
+ | <pre class="apf"> | ||
+ | # resize2fs /dev/mmcblk2p1 # for Boot | ||
+ | # resize2fs /dev/mmcblk2p2 # for Rootfs | ||
+ | ## Or on current bsp: | ||
+ | # resize2fs /dev/mmcblk1p1 # for Boot | ||
+ | # resize2fs /dev/mmcblk1p2 # for Rootfs | ||
+ | </pre> | ||
+ | |||
+ | * 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== |
− | * | + | * [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 |
Latest revision as of 11:30, 29 June 2020
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 on current bsp: # resize2fs /dev/mmcblk1p1 # for Boot # resize2fs /dev/mmcblk1p2 # 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.