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[Solved] - Compiling external driver for kernel
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sayusi
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Joined: 10 Aug 2006
Posts: 26
Location: Hungary

PostPosted: Mon Aug 20, 2018 12:32 pm    Post subject: [Solved] - Compiling external driver for kernel Reply with quote

Hi,

I have an TP-LINK T4U V2 wifi adapter installed successfully. I'm at the point I would like to update the kernel, using the linux-4.14.63-gentoo-r1 instead of 4.14.61-gentoo. Accodring to the driver description I should log in into the directory and run make clean, make, make install and everything is fine. It is not.

This is the output I get:

Code:

localhost ~/rtl8812AU_8821AU_linux # cd /root/rtl8812AU_8821AU_linux/
localhost ~/rtl8812AU_8821AU_linux # make clean
make ARCH=x86_64 CROSS_COMPILE= -C /lib/modules/4.14.61-gentoo/build M=/root/rtl8812AU_8821AU_linux clean
make[1]: *** /lib/modules/4.14.61-gentoo/build: No such file or directory.  Stop.
make: *** [Makefile:1605: clean] Error 2
localhost ~/rtl8812AU_8821AU_linux # make
make ARCH=x86_64 CROSS_COMPILE= -C /lib/modules/4.14.61-gentoo/build M=/root/rtl8812AU_8821AU_linux  modules
make[1]: *** /lib/modules/4.14.61-gentoo/build: No such file or directory.  Stop.
make: *** [Makefile:1584: modules] Error 2
localhost ~/rtl8812AU_8821AU_linux #


What I did so far to workaround this issue:

  • set the kernel version to the desired version:
    Code:

    localhost ~/rtl8812AU_8821AU_linux # eselect kernel list
    Available kernel symlink targets:
      [1]   linux-4.14.63-gentoo-r1 *
    localhost ~/rtl8812AU_8821AU_linux #

  • deleted the previous kernel directory in /usr/src
    Code:

    localhost ~/rtl8812AU_8821AU_linux # ls -l /usr/src/
    total 4
    lrwxrwxrwx  1 root root   23 Aug 20 15:35 linux -> linux-4.14.63-gentoo-r1
    drwxr-xr-x 26 root root 4096 Aug 20 15:50 linux-4.14.63-gentoo-r1
    localhost ~/rtl8812AU_8821AU_linux #

  • deleted the driver directory and fetched from github again, my aim doing this was that, every modified file will be deleted. Result: the same, the source code still wants to go to the old kernel directory.
    Code:
     localhost ~/rtl8812AU_8821AU_linux # make -d clean

    Output is here.


My questions:

  • does make cache the path to the kernel values?
  • where can I find them?
  • how can I delete them if make clean does not work?

_________________
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-- Csanyi Andras/Sayusi Ando -- http://sayusi.hu -- http://facebook.com/andras.csanyi
-- "Trust in God and keep your gunpowder dry!!" - Cromwell


Last edited by sayusi on Mon Aug 20, 2018 1:19 pm; edited 1 time in total
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 44193
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PostPosted: Mon Aug 20, 2018 12:41 pm    Post subject: Reply with quote

sayusi,

Code:
make ARCH=x86_64 CROSS_COMPILE= -C /lib/modules/4.14.61-gentoo/build M=/root/rtl8812AU_8821AU_linux clean


Is it trying to build against the running kernel?
What does
Code:
uname -r
tell?
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NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.
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sayusi
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Joined: 10 Aug 2006
Posts: 26
Location: Hungary

PostPosted: Mon Aug 20, 2018 12:43 pm    Post subject: Reply with quote

It uses still the old kernel.

Code:

localhost /home/sayusi # uname -r
4.14.61-gentoo


I'm going to reboot it.
_________________
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-- Csanyi Andras/Sayusi Ando -- http://sayusi.hu -- http://facebook.com/andras.csanyi
-- "Trust in God and keep your gunpowder dry!!" - Cromwell
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sayusi
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Joined: 10 Aug 2006
Posts: 26
Location: Hungary

PostPosted: Mon Aug 20, 2018 12:52 pm    Post subject: Reply with quote

The driver source code uses the running kernel for compiling - which is not good as you need access to the machine to compile the driver for the new kernel. It will be a bug ticket for the maintainer. It works fine.
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-- "Trust in God and keep your gunpowder dry!!" - Cromwell
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