OTA Update partitioning scheme

[NPal.2]

Hi,

I am trying to integrate swupdate for OTA update integration for STM32MP1.

In the due process I will be in need to modify the flash layout file a bit , since I am trying have an extra rootfs partition , named partition B on /dev/mmcblkp06.

I referred to flash layout currently mentioned here.

It looks to me that there is not any support for the extra rootfs which is provided.

How can i do that?

I am sure that I will be in need to change the flashlayout but since offsets are defined static in the mentioned link , I was wondering what should be offset calculation for achieving the same.

I want to achieve following scheme:

#Opt    Id      Name    Type    IP      Offset  Binary
-       0x01    fsbl1-boot      Binary  none    0x0     arm-trusted-firmware/tf-a-stm32mp157c-ev1-usb.stm32
-       0x03    fip-boot        Binary  none    0x0     fip/fip-stm32mp157c-ev1-trusted.bin
P       0x04    fsbl1   Binary  mmc1    boot1   arm-trusted-firmware/tf-a-stm32mp157c-ev1-emmc.stm32
P       0x05    fsbl2   Binary  mmc1    boot2   arm-trusted-firmware/tf-a-stm32mp157c-ev1-emmc.stm32
PD      0x06    fip     Binary  mmc1    0x00080000      fip/fip-stm32mp157c-ev1-trusted.bin
P       0x10    boot    System  mmc1    0x00480000      st-image-bootfs-openstlinux-weston-stm32mp1.ext4
P       0x11    vendorfs        FileSystem      mmc1    0x04480000      st-image-vendorfs-openstlinux-weston-stm32mp1.ext4
P       0x12    rootfs  FileSystem      mmc1    0x05480000      st-image-weston-openstlinux-weston-stm32mp1.ext4
P       0x13    rootfs2  FileSystem      mmc1   ??????????     st-image-weston-openstlinux-weston-stm32mp1.ext4
P       0x14    userfs  FileSystem      mmc1    ??????????      st-image-userfs-openstlinux-weston-stm32mp1.ext4

What shall be value at the place where I have mentioned ----> "??????????"

TIA

[Olivier GALLIEN · Accepted solution]

Hi @NPal.2​ ,

You can customized the flashlayout as per your need since you respect the recommendation for partition size

STM32CubeProgrammer flashlayout - stm32mpu

Offset is just the addition of each partition size.

The flashlayout on wiki allocate 746MB to rootfs ( you can change it )

So if you want to double it, it would give something like :

P       0x12    rootfs  FileSystem      mmc1    0x05480000      st-image-weston-openstlinux-weston-stm32mp1.ext4
P       0x13    rootfs2  FileSystem      mmc1   0x33E80000     st-image-weston-openstlinux-weston-stm32mp1.ext4
P       0x14    userfs  FileSystem      mmc1    0x62880000      st-image-userfs-openstlinux-weston-stm32mp1.ext4

Hope it help

Olivier

[NPal.2]

Hi @Community member​ : Thanks for the response. I just modified few set of things in the file :

./meta-st-stm32mp/conf/machine/include/st-machine-common-stm32mp.inc

Added below lines :

ROOTFS2_PARTITION_SIZE ?= "${IMAGE_ROOTFS_MAXSIZE}"
 PARTITIONS_CONFIG[rootfs2]  ?= "${IMAGE_BASENAME},rootfs2,,${ROOTFS_PARTITION_SIZE},FileSystem"

with I got the flashlayout generated according to my need.

Thanks for the inputs.