Building Kernel Modules

[NPal.2]

Hi,

I am currently trying to make some changes in the kernel form the latest openstlinux development package v3.1.0.

I have one query ; when we compile kernel modules are there still certian modules which do not get compiled?

I can see that after compilition I am getting an error for the vermagic for the galckore.ko which does not seem to get compiled with kernel.

Even if i have the CONFIG_MODEVERSIONS=y , still i seem to get vermagic error.

How do i get past this ?

Also how to re-compile this module?

[Kevin HUBER · Accepted solution]

Hello @NPal.2​ ,

The module galcore.ko is provided into the rootfs when the image is built from the distribution package. Which is the case of the starter package.

This module is provided already compiled and it is not compiled again by the linux of the developer package.

If you have set CONFIG_MODVERSIONS=y, you are able to use a module built for another kernel, which is the case here.

I think you encounter this error because you are using a starter package misaligned with the v3.1.0.

You have to use the Starter Package of the v3.1.0 to have the correct rootfs and the correct galcore.ko, to be used with the developer package v3.1.0.

Please follow this page to be sure to flash the Starter package v3.1.0 on your board: https://wiki.st.com/stm32mpu/wiki/Getting_started/STM32MP1_boards/STM32MP157x-DK2/Let%27s_start/Populate_the_target_and_boot_the_image#Download_the_image

Then copy again your modified kernel on the board.

To verify if you use the right version of galcore.ko related to your kernel version, you can use these commands:

Check the kernel version:

root@stm32mp1:~# uname -a
Linux stm32mp1 5.10.61 #1 SMP PREEMPT Thu Aug 26 12:51:21 UTC 2021 armv7l armv7l armv7l GNU/Linux

Then check for which version of kernel the module is made:

root@stm32mp1:~# modinfo galcore
filename:       /lib/modules/5.10.61/extra/galcore.ko
license:        Dual MIT/GPL
description:    Vivante Graphics Driver
alias:          of:N*T*Cvivante,gcC*
alias:          of:N*T*Cvivante,gc
alias:          of:N*T*Cst,gcnanoC*
alias:          of:N*T*Cst,gcnano
depends:        
name:           galcore
vermagic:       5.10.61 SMP preempt mod_unload modversions ARMv7 p2v8

The kernel versions of the two commands must match.

Regards,

Kevin

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[NPal.2]

HI @Kevin HUBER​ : Thanks a lot for the response. This solve my query.

[mteaching]

root@stm32mp1:~# [   38.778847] Time out check galcore device expired
[   38.859620] Configure weston on pixman
[   57.220735] ipv6: disagrees about version of symbol module_layout
[   57.252771] ipv6: disagrees about version of symbol module_layout
[   57.275599] ipv6: disagrees about version of symbol module_layout
[   57.289619] ipv6: disagrees about version of symbol module_layout
[   57.900615] ipv6: disagrees about version of symbol module_layout
[   59.496528] cfg80211: disagrees about version of symbol module_layout
[   61.031792] ipv6: disagrees about version of symbol module_layout
 
root@stm32mp1:~# modinfo galcore
filename:       /lib/modules/5.10.61/extra/galcore.ko
license:        Dual MIT/GPL
description:    Vivante Graphics Driver
alias:          of:N*T*Cvivante,gcC*
alias:          of:N*T*Cvivante,gc
alias:          of:N*T*Cst,gcnanoC*
alias:          of:N*T*Cst,gcnano
depends:
name:           galcore
vermagic:       5.10.61 SMP preempt mod_unload modversions ARMv7 p2v8
root@stm32mp1:~# uname -a
Linux stm32mp1 5.10.61 #1 SMP PREEMPT Tue Apr 19 18:42:33 PDT 2022 armv7l armv7l armv7l GNU/Linux
hciconfig -a
[  726.972340] libaes: disagrees about version of symbol module_layout
Can't open HCI socket.: Address family not supported by protocol
hciconfig -a
[  745.029383] libaes: disagrees about version of symbol module_layout
Can't open HCI socket.: Address family not supported by protocol

First of all, why is this happening to so many people？Could you please make it easy in next version?

I have followed this page to be sure to flash the Starter package v3.1.0 on my board: https://wiki.st.com/stm32mpu/wiki/Getting_started/STM32MP1_boards/STM32MP157x-DK2/Let%27s_start/Populate_the_target_and_boot_the_image#Download_the_image

I did not make any changes to the kernel and just build it.

This problem has been bothering me for a year,please give me some help.

Here is the full log:

[mteaching]

root@stm32mp1:~# [   38.778847] Time out check galcore device expired
[   38.859620] Configure weston on pixman
[   57.220735] ipv6: disagrees about version of symbol module_layout
[   57.252771] ipv6: disagrees about version of symbol module_layout
[   57.275599] ipv6: disagrees about version of symbol module_layout
[   57.289619] ipv6: disagrees about version of symbol module_layout
[   57.900615] ipv6: disagrees about version of symbol module_layout
[   59.496528] cfg80211: disagrees about version of symbol module_layout
[   61.031792] ipv6: disagrees about version of symbol module_layout
 
root@stm32mp1:~# modinfo galcore
filename:       /lib/modules/5.10.61/extra/galcore.ko
license:        Dual MIT/GPL
description:    Vivante Graphics Driver
alias:          of:N*T*Cvivante,gcC*
alias:          of:N*T*Cvivante,gc
alias:          of:N*T*Cst,gcnanoC*
alias:          of:N*T*Cst,gcnano
depends:
name:           galcore
vermagic:       5.10.61 SMP preempt mod_unload modversions ARMv7 p2v8
root@stm32mp1:~# uname -a
Linux stm32mp1 5.10.61 #1 SMP PREEMPT Tue Apr 19 18:42:33 PDT 2022 armv7l armv7l armv7l GNU/Linux
hciconfig -a
[  726.972340] libaes: disagrees about version of symbol module_layout
Can't open HCI socket.: Address family not supported by protocol
hciconfig -a
[  745.029383] libaes: disagrees about version of symbol module_layout
Can't open HCI socket.: Address family not supported by protocol

First of all, why is this happening to so many people？Could you please make it easy in next version?

I have followed this page to be sure to flash the Starter package v3.1.0 on my board: https://wiki.st.com/stm32mpu/wiki/Getting_started/STM32MP1_boards/STM32MP157x-DK2/Let%27s_start/Populate_the_target_and_boot_the_image#Download_the_image

I did not make any changes to the kernel and just build it.

This problem has been bothering me for a year,please give me some help.

Here is the full log:

[Kevin HUBER]

Hello @mteaching​ ,

Sorry for that, but we can't "make it easy" because its a security features of Linux that exists at least from 2015.

To have more information on this error, you can search on internet "disagrees about version of symbol module_layout".

To summarize, after each build of your linux, the module_layout version of your modules changes and you must always have the module layout version related to your uImage Kernel into the board.

The only way to avoid having this error is to copy the modules after each build, by following the procedure to Deploy the Linux Kernel on the board:

https://wiki.st.com/stm32mpu/wiki/Getting_started/STM32MP1_boards/STM32MP157x-DK2/Develop_on_Arm%C2%AE_Cortex%C2%AE-A7/Modify,_rebuild_and_reload_the_Linux%C2%AE_kernel#Deploy_the_Linux-C2-AE_kernel_on_the_board

For your case, the part 5.3 Push the kernel modules onto the board is the one that you must be sure to do.

Hope it helps,

Regards,

Kevin

[mteaching]

Thank you for your professional and quick reply!

In fact, I did all the steps five months ago, including the one you said of course. Today I rebuilt the environment and repeated it, the result is almost the same. It takes me at least two hours to do all this.

As I said, othre drivers are OK but the weston desktop reboot on every boot.

The question "Time out check load galcore module expired" still exits.

Please refer to this discussion（https://community.st.com/s/question/0D53W00000JiZmuSAF/stm32mp157caa3-galcoreko），although my answer is set to be optimal, error is still there.

root@stm32mp1:~# modinfo galcore
filename:       /lib/modules/5.10.61/extra/galcore.ko
license:        Dual MIT/GPL
description:    Vivante Graphics Driver
alias:          of:N*T*Cvivante,gcC*
alias:          of:N*T*Cvivante,gc
alias:          of:N*T*Cst,gcnanoC*
alias:          of:N*T*Cst,gcnano
root@stm32mp1:~# uname -a
Linux stm32mp1 5.10.61 #1 SMP PREEMPT Wed Apr 20 20:02:01 PDT 2022 armv7l armv7l armv7l GNU/Linux

Do you have any suggestions for these issues?

Here is the full log:

Thank you again.

[Kevin HUBER]

Hello @mteaching​ ,

Nice, at least you do not have the error "disagrees about version of symbol module_layout" on all the other modules anymore.

I will try to help you on the "Time out check" error, but please can you create your own post. The goal is to have a post by issue to mark the answer as best when we found the problem. It helps the other users to find the information.

Regards,

Kevin

[mteaching]

OK，sir.

I post this problem months ago.No satisfactory answer has been received so far,so I said something here.

Any suggestions or ideas please reply here(https://community.st.com/s/question/0D53W00001KSSAoSAP/time-out-check-load-galcore-module-expired-how-to-solve-it).Looking forward to your early reply.