Ti am335x industrial control module uses the Debian system of beaglebone (BBB)

The verification of this content uses yingpengfei embedded CoM-335x Core module and Evaluation Board EAC-335X,CoM-335X The core module is
Beaglebone black The smallest system of , The product introduction is as follows ：

 

 

 

One 、 download BBB Of Debian System image

Download address ：http://elinux.org/Beagleboard:BeagleBoneBlack_Debian#Debian_Releases

 

according to EMMC perhaps TF The size of the card , Choose the right image to download . It should be noted that ,2G The mirror image of burning writes TF There is only one behind the card EXT4 Format root file system partition , but 4G The image of has a FAT32 Format boot partition and a EXT4 Format root file system partition .

Download the Debian File system mirroring , It may not conform to the actual operating environment , Here refers to the middle Linux Kernel driver module （modules） It may be different from what we expect （Linux The kernel version is inconsistent with that in the image , The function of the drive module does not conform to ）. therefore ,

You need to add the current kernel module . The compilation environment is buildroot And Linux Two cases , Here are the introduction .

1、buildroot Compile environment

buildroot Full compilation or recompile Linux after , The default installation path of the driver module is ：output/target/lib/modules/ , Just copy the directory under this directory to Debian In the mirror image . Download the Debian rootfs It's a mirror file , First mount , Then copy the driver module .

① Decompression mirror image

host$ unxz bone-debian-9.1-lxqt-armhf-2017-08-31-4gb.img.xz

② Mount the image

If you mount directly, you will be prompted that the file system type does not match , Failed to mount ：

Use file View image information , Whether there is starting block information ：

The starting sector in the above figure is 8192, The size of each sector is 512 byte, The starting address is ： 8192 * 512 = 4194304 byte . Specify the starting address when mounting ：

# sudo mount -o loop,offset=4194304 bone-debian-9.1-lxqt-armhf-2017-08-31-4gb.img /media/

③ Copy the driver module

host$ sudo cp -r output/target/lib/modules/4.14.67/ /media/lib/modules/

host$ ls /media/lib/modules/4.14.67/

④ pack rootfs

host$ cd /media/

host$ sudo tar -cf ~/com335x-debian-9.1-rootfs.tar *

host$ sudo umount /media

2、Linux Compile environment

① Install the drive module

Use Linux BSP After compilation , The driver module needs to be installed , To install to debian_rootfs For example ：

host$ export INSTALL_MOD_PATH=debian_rootfs

host$ make ARCH=arm modules_install

Delete the linked file in the generation module , Then copy it to Debian Mirror image /lib/modules/ Catalog ,Debian Image decompression reference buildroot Compile environment .

host$ rm -rf debian_rootfs/lib/modules/4.14.67-g7795948/build

host$ rm -rf debian_rootfs/lib/modules/4.14.67-g7795948/source

notes ： It is best to specify the installation path , The default path is /, If you do not specify the installation path and use permission root perform , Then install to the host .

② Unzip and mount the image

Reference resources buildroot An example of a compilation environment .

③ Copy the driver module

host$ cp -r debian_rootfs/lib/modules/4.14.67-g7795948/  /media/lib/modules/

host$ ls /media/lib/modules/4.14.67-g7795948/

④ pack rootfs

Reference resources buildroot An example of a compilation environment .

Last , One point in particular . Use git Managed Linux BSP, The compiled image distribution is shipped with git commit ID And change . if Linux Kernel image upgrade , It also needs to be modified or replaced Debian Driver module of . Upgrade frequently Linux to Debian Inconvenience , To solve this problem, you can modify scripts/setlocalversion  file ：

take 47 That's ok ：if test -z "$(git rev-parse --show-cdup 2>/dev/null)" && 

Change it to ：if test -n "$(git rev-parse --show-cdup 2>/dev/null)" &&

Two 、 Write the mirror image to TF card

After downloading the image , Can be in Ubuntu perhaps Windos Burn the image to TF card , But here's the thing , The downloaded image is compressed xz Compressed package of format , therefore , In both systems, you need to install the decompression tool first .

Ubuntu The next burning

a、 install xz Tools

$sudo apt-get install xz-utils

b、 Unzip the image package

$xz -d XX.img.xz

c、 Burning part , Please refer to https://help.ubuntu.com/community/Installation/FromImgFiles#Ubuntu

Windos The next burning

Please refer to http://beagleboard.org/getting-started#update, It should be noted that ,7-zip Tools can be installed according to the actual situation , If you have installed decompressable xz Format tools （ If good pressure ）, There is no need to install .

After burning and writing , No matter what kind of mirror , Will be in TF Cary generates a ext4 Format rootfs Partition , What's in it is Debian System .

3、 ... and 、EMMC burning

According to the foregoing , You need to burn the previous step first TF Cary's rootfs Copy the files in the partition , Make it into a compressed package , Then according to the CD provided EMMC Write relevant manuals , Burn the system to EMMC. because Windos I can't recognize ext4 grid

Type partition , And in Windos Operating on the root file system file will result in some file properties （ Such as link and permission attributes ） The loss of , therefore , The following steps are required in Ubuntu Lower operation , And in root User permissions Next operation ：

1、 Insert TF card , Generally, it is automatically mounted to /media Under the table of contents

2、 take TF Cary rootfs Copy all files in the partition , And make it into a compressed package

#cp /media/rootfs/ ./ -a

#cd rootfs

#tar -zcvf  rootfs.tar.gz ./*

After execution , Generate rootfs.tar.gz file , You can also use tar -cvf  rootfs.tar ./* command , Generate tar Compressed package of format . thus , It can be provided according to the CD EMMC Write relevant manuals , Burn the system to EMMC.