Solution to the failure of 6ull to load the Linux driver module

0x01 Failed to load the driver module

The description of the failure to load the driver is as follows. The error message indicates that the Linux kernel version running on the board is 4.1.15-g49efdaa, and the architecture is ARMv7; while the kernel source code version used to compile the driver is 4.1.15, and the architecture is ARMv6. This indicates that the kernel version name and architecture used to compile the driver are inconsistent with those running on the board.

root@ALIENTEK-IMX6U:~/get# insmod led.ko
[ 1634.442887] led: version magic '4.1.15 SMP preempt mod_unload modversions ARMv6 p2v8 ' should be '4.1.15-g49efdaa SMP preempt mod_unload modversions ARMv7 p2v8 '
insmod: ERROR: could not insert module led.ko: Invalid module format

0x02 Solution

There are two ways to solve this:
(1) Recompile the kernel and device tree and burn them to the board.
(2) Change the kernel configuration information in the host to make it consistent with that in the board.

Reburning the kernel is troublesome, so here we use method 2 .

1. Enter the commands uname -r and uname -p in the board terminal to view the version and architecture information of the kernel running on the board.

root@ALIENTEK-IMX6U:~/get# uname -r
4.1.15-g49efdaa
root@ALIENTEK-IMX6U:~/get# uname -p
armv7l

The Linux kernel version running on the board is 4.1.15-g49efdaa , and the processor architecture is ARMv7

2. Enter the root directory of the Linux kernel used by the driver module in the host, and execute make menuconfig to start the Linux kernel graphical configuration interface (if you cannot use menuconfig, you can use Baidu to install the corresponding dependent libraries)

As shown in the figure below, enter System Type option:

Then enter the Multiple platform selection option:

Then in the interface below, cancel the * in front of the first ARMv6 based platforms（ARM11） (press the spacebar to cancel after selecting it)

After canceling, save and exit, and the architecture supported by the kernel will be changed to ARMv7.
After configuring menuconfig, do not enter other kernel configuration commands, otherwise the previous configuration will be flushed.

3. Open the Makefile in the kernel root directory and add the second half of the Linux kernel version number running on your board after the EXTRAVERSION variable. For example, the second half of my kernel is -g49efdaa .

Save the changes after completion, and execute make -j12 in the Linux kernel root directory to recompile the kernel.
Recompile the driver module after the kernel is compiled.

After the driver module is compiled, use NFS to download it to the board. Enter modinfo [驅動模塊名] to view the driver module information:

root@ALIENTEK-IMX6U:~/get# modinfo led.ko
filename: /home/root/get/led.ko
author: zuozhongkai
license: GPL
srcversion:597E1DDC8A372707B8FD0DE
depends:
vermagic: 4.1.15-g49efdaa SMP preempt mod_unload modversions ARMv7 p2v8

It can be seen that the kernel version and processor architecture of the driver module displayed in vermagic line are consistent with the kernel information in the board, and the driver module can be loaded successfully.

root@ALIENTEK-IMX6U:~/get# uname -r
4.1.15-g49efdaa
root@ALIENTEK-IMX6U:~/get# uname -p
armv7l

Summarize

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