APF6 EMMC: Difference between revisions

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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="10" cellspacing="0" summary="APF6 eMMC partitions"
{| border="1" cellpadding="10" cellspacing="0" summary="APF6 eMMC partitions"
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{| border="1" cellpadding="5" cellspacing="0" summary="APF6 eMMC partitions details"
{| border="1" cellpadding="5" cellspacing="0" summary="APF6 eMMC partitions details"
|----------------
|- style="background:#efefef;" align="center"
!Name || U-Boot name || Size || Comment
!Name || U-Boot name || Size || Comment
|----------------
|----------------
|boot0 || mmc dev 0 1 || 2MB || U-Boot is installed on this partition
|boot0 || mmc dev 0 1 || 2MBytes || U-Boot is installed on this partition
|----------------
|----------------
|boot1 || mmc dev 0 2 || 2MB || Not used
|boot1 || mmc dev 0 2 || 2MBytes || Not used
|----------------
|----------------
|rpmb || mmc dev 0 3 || 512K || Not used
|rpmb || mmc dev 0 3 || 512KBytes || Not used
|----------------
|----------------
|User Data || mmc dev 0 0 || remaining space || Kernel, device tree and rootfs
|User Data || mmc dev 0 0 || remaining space || Kernel, device tree and rootfs
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|}
|}


== 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" | ...
|}


== Boot0 partition layout ==
* 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
|----------------
|----------------
! Offset || Comment
||| || || Free
|----------------
|----------------
|0 ||  
|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"
|----------------
|----------------
|1 KB || U-Boot SPL (apf6-u-boot.spl)
| 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
|----------------
|----------------
|69 KB || U-Boot IMG (apf6-u-boot.img)
|MBR || NA || NA || 0 || 0 || 512 bytes (1 block) || Master Boot Record. (Don't touch it :-) )
|----------------
|----------------
|512 KB ||  
|... || NA || NA || 512 || 1 || ~1 MBytes (2047 blocks) || Free
|----------------
|----------------
|1024 KB || U-Boot environment
|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)
|----------------
|----------------
|1536 KB || Redundant U-Boot environment
|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>


== User Data partition Layout ==
* 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>


There are two primary partitions on the User data physical partition.


* boot: The kernel and the device tree (inside a dtbs directory) are on this partition.
Rootfs/Boot will then be extended to all the "Rootfs"/"Boot" eMMC partitions space.
* rootfs: the rootfs is on this partition


==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

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.

Links

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