AM62A7: Discussion: About the WIC file generation process

YuWei Wu

Part Number: AM62A7

Tool/software:

HI,

When I was looking at TI's wic file generation process, I noticed that the file tisdk-edgeai-sdimage.wks has the following content

# short-description: Create a fixed size SD card image with 2 partitions
# long-description: Creates a partitioned SD card image for TI platforms.
# Boot files are located in the first vfat partition with extra reserved space.

part /boot --source bootimg-partition --ondisk mmcblk0 --fstype=vfat --label BOOT --active --align 1024 --fixed-size 128M --use-uuid
part / --source rootfs --ondisk mmcblk0 --fstype=ext4 --label rootfs --align 1024 --use-uuid

I want to know the exact location of the folders bootimg-partition and rootfs specified by --source during wic file generation.

Is their search path specified by a variable? Or a fixed storage location?

Thanks,

Yuwei Wu

over 1 year ago

0 Bin Liu over 1 year ago

TI__Guru**** 167581 points

Hi Yuwei,

Where do you get the wic file generation process? Is it in Yocto or something else?

0 YuWei Wu over 1 year ago in reply to Bin Liu

Intellectual 270 points

Hi Bin

I got the wic file from TI yocto project.

Thanks,

Yuwei

0 Bin Liu over 1 year ago in reply to YuWei Wu

TI__Guru**** 167581 points

Hi Yuwei,

I am routing your query to our Yocto expert for comments.

0 Andreas Dannenberg over 1 year ago in reply to Bin Liu

TI__Guru 69602 points

Hi Yuwei,

what are you trying to do here? Add extra files to the wic image? Or something else?

Regards, Andreas

0 YuWei Wu over 1 year ago in reply to Andreas Dannenberg

Intellectual 270 points

Hi Andreas

I want to solve two problems:

1.I want to change the number of partitions to 4 and the size to 8Gb

2.I want to manually add a file called libxxxx.so in the directory /usr/lib

Thanks,

Yuwei

0 Andreas Dannenberg over 1 year ago in reply to YuWei Wu

TI__Guru 69602 points

YuWei Wu said:
2.I want to manually add a file called libxxxx.so in the directory /usr/lib

Usually I'd recommend creating a recipe for this that contributes this particular file (ideally build from source?). Anyways if you just want adding binary files for example for test / debug purposes, you can use the below approach. It's an example from my Yocto notes, customize for what you need.

================================================================================
Adding Extra Files to rootfs
================================================================================
Example, for dropbear, with the ssh host key store along side the local.conf:                                                                     

1. Extend local.conf:                                                                                                                    
   INHERIT += "rootfsdebugfiles"                                                                                                         
   ROOTFS_DEBUG_FILES += "${TOPDIR}/conf/dropbear_rsa_host_key ${IMAGE_ROOTFS}/etc/dropbear/dropbear_rsa_host_key ;"                     

2. Boot the image once, copy the dropbear_rsa_host_key from                                                                              
   the device into your build conf directory.                                                                                            

3. A optional parameter can be used to set file mode                                                                                     
   of the copied target, for instance:                                                                                                   
   ROOTFS_DEBUG_FILES += "${TOPDIR}/conf/dropbear_rsa_host_key ${IMAGE_ROOTFS}/etc/dropbear/dropbear_rsa_host_key 0600;"                 
   in case they might be required to have a specific mode. (Shoundn't be too open, for example)

YuWei Wu said:
1.I want to change the number of partitions to 4 and the size to 8Gb

Let me look into this a bit closer and get back to you.

Regards, Andreas

+1 Andreas Dannenberg over 1 year ago in reply to YuWei Wu

TI__Guru 69602 points

YuWei Wu said:
1.I want to change the number of partitions to 4 and the size to 8Gb

There's pretty detailed documentation here https://docs.yoctoproject.org/dev/ref-manual/kickstart.html#openembedded-kickstart-wks-reference that explains how you can customize your partition layout etc. by making changes to your wks file.

Regards, Andreas

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AM62A7: Discussion: About the WIC file generation process