How can I symlink to the kernel source in "/lib/modules/'uname -a'/build"?

[danny]

Hi
I want to symlink to the kernel source in "/lib/modules/'uname -a'/build".
But there is not "/usr/src/linux-headers-XXX/" directory on piCore11.X.
How can I produce file "/lib/modules/'uname -a'/build"?

Thanks

[Juanito]

If you wish to compile kernel modules, you often need to symlink "/lib/modules/'uname -r'/build" to the unpacked and prepared kernel source.

For example, if you unpacked your kernel source at /usr/src/linux-rpi-4.19.81, then you would do this:

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$ sudo ln -s /usr/src/linux-rpi-4.19.81 /lib/modules/4.19.81-piCore-v7l/build

[danny]

I got the following message.

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ln: /lib/modules/4.19.81-piCore-v7l/build: No such file or directory
Thanks

[Juanito]

It looks like you either miss-typed the command or you did not create /usr/src/linux-rpi-4.19.81?

[danny]

How can I create /usr/src/linux-rpi-4.19.81?

[Rich]

Hi danny
This should do it:

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sudo su
mkdir /usr/src
cd /usr/src
wget http://www.tinycorelinux.net/11.x/armv7/releases/RPi/src/kernel/linux-rpi-4.19.81.tar.xz
tar Jxvf linux-rpi-4.19.81.tar.xz
exit
Are you trying to build a kernel module? There are a lot more pre-compiled modules available in  modules.tar.gz  found here:
http://www.tinycorelinux.net/11.x/armv7/releases/RPi/src/kernel/

[danny]

The file in linux-rpi-4.19.81.tar.xz is too large to unzip to /usr/src.
It is only 833MB available /usr/src.
So I unzip it to /mnt/mmcblk0p3/linux-rpi-4.19.81 and execute the following:

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sudo ln -s /mnt/mmcblk0p3/linux-rpi-4.19.81 /lib/modules/4.19.81-piCore-v7/buildBut my wifi driver still can't identify kernel.

[Juanito]

Please paste the error message here.

[danny]

The message is:

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insmod: can't insert 'onebox_common_gpl.ko': invalid module format
insmod: can't insert 'wlan.ko': invalid module format
insmod: can't insert 'wlan_wep.ko': invalid module format
insmod: can't insert 'wlan_tkip.ko': invalid module format
insmod: can't insert 'wlan_ccmp.ko': invalid module format
insmod: can't insert 'wlan_aes_cmac.ko': invalid module format
insmod: can't insert 'wlan_acl.ko': invalid module format
insmod: can't insert 'wlan_xauth.ko': invalid module format
insmod: can't insert 'wlan_scan_sta.ko': invalid module format
insmod: can't insert 'onebox_wlan_nongpl.ko': invalid module format
insmod: can't insert 'onebox_wlan_gpl.ko': invalid module format
insmod: can't insert 'onebox_nongpl.ko': invalid module format
insmod: can't insert 'onebox_gpl.ko': invalid module format
cat: can't open '/proc/rpine0/stats': No such file or directory
Exiting: Driver init is not yet completed, Please check the coex mode / protocol selected

I want to use wifi module RYWDB00 on piCore.
I have used it successfully on Raspbian.
RYWDB00 support Kernel versions from 2.6.38 to 5.1.6.

[Juanito]

Kernel drivers taken from raspbian will not work on piCore.

You need the symlink to compile an out of tree driver, not use it.

[danny]

Does it mean compile file in linux-rpi-4.19.81.tar.gz and let /lib/modules/4.19.81-piCore-v7/build symlink to it?

[Juanito]

No - I presume the driver source code for the RYWDB00 is not available in the linux kernel source.

If the above is true, then you need to obtain the source code for the RYWDB00 driver.

Once you have the source code for the driver you need to compile it against the prepared piCore kernel source.

[danny]

OK,it sounds difficult.
I have obtained the source code of driver.
But I have no idea to make it compile it against the prepared piCore kernel source.
Could you provide any advice?
Thank you so much!

[Juanito]

The first problem is to find the kernel config for piCore-11beta - I don't have it 

[Paul_123]

grab configs.ko from the complete modules pack,

modprobe configs.ko
zcat /proc/config.gz