TDA4VM-Q1: [Q] about the "Customizing own kernel source"

Hello Hosung,

Shin hosung said:

As the "the customizing the linux kernel" is " work with our own kernel source ".

Can you tell us what custom kernel you are referring to here? Is this a TDA4VM kernel or some other platform?

Please note that we do not support our competition platform. Let us know.

Thanks.

Hi Praveen,

Of course, It's your kernel ( TDA4VM kernel >> after building,  this is the directory : yocto-build/build/arago-tmp-default-glibc/work-shared/j721e-evm/kernel-source )

best regards,

hosung shin.

Hi Hosung,

Do you want to use a customized kernel within a Yocto build so bitbake picks up your custom kernel, or do you have an existing system and just want to rebuild the kernel and install it onto the system?

For just rebuilding the kernel, instructions can be found here: J721E Kernel User Guide.

Best,
Jared

Hi Jared,

I was going to inquire about this J721E kernel User guide.

Please confirm if my understanding is correct.

I used the NXP yorto project in first time, then, your yorto project(TDA4VM) is second time.

As you know, the NXP yorto project ( varisicte project) 's building is like below

(A) environment setup : MACHINE=imx8mp-var-dart DISTRO=fsl-imx-xwayland . var-setup-release.sh build_xwayland

(B) kernel modified  : gedit arch/arm64/boot/dts/freescale/imx8mp-var-dart.dts /  git commit -a -m "my device tree changes"

(C) compile : bitbake image_full 

(D) image : make this image for SD card  (  imx-image-full-imx8qmmek-20240305234652.rootfs.wic.bz2 )

Then, your project ( TDA4VM )'s buidling is like below

(A-1) environment setup : . conf/setenv  / echo 'ARAGO_BRAND = "edgeai"' >> conf/local.conf

(B-1) kernel modified : 

          kernel environment : export PATH=<sdk path>/linux-devkit/sysroots/x86_64-arago-linux/usr/bin/aarch64-oe-linux:$PATH

                                           make ARCH=arm64 CROSS_COMPILE=aarch64-oe-linux- <defconfig>

          source modified...( >> arch/arm64/boot/dts/freescale/imx8mp-var-dart.dts )

          make ARCH=arm64 CROSS_COMPILE=aarch64-oe-linux- Imag

         change “linux.bin” to “<path-to-tisdk>/board-support/prebuilt-images/Image”.

(C-1) compile : MACHINE=j721e-evm  bitbake -k tisdk-edgeai-image

(D-1) image : make the image for SD card  ( tisdk-edgeai-image-j721e-evm-20240306095053.rootfs.wic.xz)

If that's a right, your (B-1) is a very difficult.

Is there a way to reduce (B-1) to (B) ?

best regards,

hosung shin.

Hi Hosung,

To create a new image in Yocto, you can make a new layer and create a bbappend to edit the kernel with any patches you make. More in-depth instructions can be found within the Yocto project's documentation.

You could also use a bbappend to change where the recipe is grabbing the kernel from, and change it to a local file/directory instead for git.ti.com.

Best,
Jared

Hi Jared,

As you said " You could also use a bbappend to change where the recipe is grabbing the kernel from, and change it to a local file/directory instead for git.ti.com "

That's what I wanted.

Could you supported the detailed information for that.

I am already trying it, but, it doesn't work.

My changed point in linux-ti-staging_6.1.bb 

Please, advice for my changed point

[before]

KERNEL_GIT_URI ?= "git://git.ti.com/git/ti-linux-kernel/ti-linux-kernel.git"
KERNEL_GIT_PROTOCOL = "https"
SRC_URI += "${KERNEL_GIT_URI};protocol=${KERNEL_GIT_PROTOCOL};branch=${BRANCH} \
                      file://defconfig"

[after]

KERNEL_GIT_URI ?= "git://$(BSPDIR)/board-support/kernel-source"
KERNEL_GIT_PROTOCOL = "file"
SRC_URI += "${KERNEL_GIT_URI};protocol=${KERNEL_GIT_PROTOCOL};branch=${BRANCH} \
                      file://defconfig"

best regards,

hosung shin.

Hi Hosung,

I assume BSPDIR is the location of the directory you want. Did you use parenthesis or braces to surround it? They should be braces. Can you also append a / to the end of your KERNEL_GIT_URI variable?

Best,
Jared

Hi Jared,

Sure, I used it like below..

also, the "/home/wise/ext_hdd2/shs/ti-tda4vm-bspbase1/board-support/kernel-source " is the kernel source code.

## [tenchi]
BSPDIR = "/home/wise/ext_hdd2/shs/ti-tda4vm-bspbase1"
KERNEL_GIT_URI ?= "git://$(BSPDIR)/board-support/kernel-source"
KERNEL_GIT_PROTOCOL = "file"
SRC_URI += "${KERNEL_GIT_URI};protocol=${KERNEL_GIT_PROTOCOL};branch=${BRANCH} \
                       file://defconfig"

But, It was happend the building error like below..

also I attached this error log file ( builderror1.log ) 

NOTE: Started PRServer with DBfile: /home/wise/ext_hdd2/shs/ti-tda4vm-bspbase1/yocto-build/build/cache/prserv.sqlite3, Address: 127.0.0.1:33615, PID: 1791728
Loading cache...done.
Loaded 9394 entries from dependency cache.
Parsing recipes...done.
Parsing of 6324 .bb files complete (6320 cached, 4 parsed). 9398 targets, 613 skipped, 0 masked, 0 errors.
NOTE: Resolving any missing task queue dependencies
NOTE: Resolving any missing task queue dependencies
NOTE: Resolving any missing task queue dependencies
NOTE: Resolving any missing task queue dependencies
NOTE: Resolving any missing task queue dependencies
NOTE: Resolving any missing task queue dependencies

Build Configuration (mc:default):
BB_VERSION           = "2.0.0"
BUILD_SYS            = "x86_64-linux"
NATIVELSBSTRING      = "ubuntu-20.04"
TARGET_SYS           = "aarch64-oe-linux"
MACHINE              = "j721e-evm"
DISTRO               = "arago"
DISTRO_VERSION       = "2023.10"
TUNE_FEATURES        = "aarch64"
TARGET_FPU           = ""
meta-arago-distro    
meta-arago-extras    
meta-arago-demos     
meta-arago-test      = "HEAD:769c052cff7eccb08de6d0f1dbcbac5c56b6b77a"
meta-qt5             = "HEAD:ae8a97f79364bed1abc297636f7933d0e35f22be"
meta-virtualization  = "HEAD:67b0ef4256a484851f3556d281ca4caa88374388"
meta-networking      
meta-python          
meta-oe              
meta-gnome           
meta-filesystems     = "HEAD:8a75c61cce2aa1d6e5a3597ab8fc5a7e6aeae1e4"
meta-ti-extras       
meta-ti-bsp          = "HEAD:8a468a00043e824ca85b1065f770b045b5f894d7"
meta-arm             
meta-arm-toolchain   = "HEAD:b187fb9232ca0a6b5f8f90b4715958546fc41d73"
meta                 = "HEAD:11da43b58e19583a9bc16044309610cfb2e86469"
meta-tisdk           = "HEAD:7a4f8861879ec1ac2675e51e96920989c2522960"
meta-edgeai          = "HEAD:8e6594ed87582cd9b19e1cf2007d8514fcf03c85"


Build Configuration:
BB_VERSION           = "2.0.0"
BUILD_SYS            = "x86_64-linux"
NATIVELSBSTRING      = "ubuntu-20.04"
TARGET_SYS           = "arm-oe-eabi"
MACHINE              = "j721e-evm-k3r5"
DISTRO               = "arago"
DISTRO_VERSION       = "2023.10"
TUNE_FEATURES        = "arm armv7a vfp thumb callconvention-hard"
TARGET_FPU           = "hard"
meta-arago-distro    
meta-arago-extras    
meta-arago-demos     
meta-arago-test      = "HEAD:769c052cff7eccb08de6d0f1dbcbac5c56b6b77a"
meta-qt5             = "HEAD:ae8a97f79364bed1abc297636f7933d0e35f22be"
meta-virtualization  = "HEAD:67b0ef4256a484851f3556d281ca4caa88374388"
meta-networking      
meta-python          
meta-oe              
meta-gnome           
meta-filesystems     = "HEAD:8a75c61cce2aa1d6e5a3597ab8fc5a7e6aeae1e4"
meta-ti-extras       
meta-ti-bsp          = "HEAD:8a468a00043e824ca85b1065f770b045b5f894d7"
meta-arm             
meta-arm-toolchain   = "HEAD:b187fb9232ca0a6b5f8f90b4715958546fc41d73"
meta                 = "HEAD:11da43b58e19583a9bc16044309610cfb2e86469"
meta-tisdk           = "HEAD:7a4f8861879ec1ac2675e51e96920989c2522960"
meta-edgeai          = "HEAD:8e6594ed87582cd9b19e1cf2007d8514fcf03c85"

Initialising tasks...done.
Sstate summary: Wanted 125 Local 79 Mirrors 0 Missed 46 Current 4555 (63% match, 99% complete)
NOTE: Executing Tasks
NOTE: Running task 2140 of 11842 (/home/wise/ext_hdd2/shs/ti-tda4vm-bspbase1/yocto-build/sources/meta-ti/meta-ti-bsp/recipes-kernel/linux/linux-ti-staging_6.1.bb:do_fetch)
NOTE: recipe linux-ti-staging-6.1.46+gitAUTOINC+5892b80d6b-r0b.arago5_tisdk_1_edgeai_0_edgeai_7: task do_fetch: Started
WARNING: linux-ti-staging-6.1.46+gitAUTOINC+5892b80d6b-r0b.arago5_tisdk_1_edgeai_0_edgeai_7 do_fetch: Failed to fetch URL git://$(BSPDIR)/board-support/kernel-source;protocol=file;branch=ti-linux-6.1.y, attempting MIRRORS if available
NOTE: recipe linux-ti-staging-6.1.46+gitAUTOINC+5892b80d6b-r0b.arago5_tisdk_1_edgeai_0_edgeai_7: task do_fetch: Failed
NOTE: Tasks Summary: Attempted 11724 tasks of which 11723 didn't need to be rerun and 1 failed.
NOTE: Writing buildhistory
NOTE: Writing buildhistory took: 4 seconds
NOTE: Writing buildhistory
NOTE: Writing buildhistory took: 4 seconds

Summary: 1 task failed:
  /home/wise/ext_hdd2/shs/ti-tda4vm-bspbase1/yocto-build/sources/meta-ti/meta-ti-bsp/recipes-kernel/linux/linux-ti-staging_6.1.bb:do_fetch
Summary: There was 1 WARNING message.
Summary: There were 2 ERROR messages, returning a non-zero exit code.

please, advice for this error.

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best regards,

hosung shin.

Hi Jared,

It works( building is OK), Big thanks you for your support.

best regards,

hosung shin.