Install Gentoo on rpi2 but /usr/src is empty

[owrjeyz]

I install gentoo on rpi2 according to Quick_Install_Guide using builded image armv7l, but when I try to install some driver like x11-drivers/xf86-video-omapfb-0.1.1.1_p1" the head of output is :

Code: Select all

* Unable to find kernel sources at /usr/src/linux
 * Please make sure that /usr/src/linux points at your running kernel, 
 * (or the kernel you wish to build against).
 * Alternatively, set the KERNEL_DIR environment variable to the kernel sources location
 * Unable to calculate Linux Kernel version for build, attempting to use running version
 * Checking for suitable kernel configuration options...    

and end up with "Makefile:478: recipe for target 'omapfb-xv-blizzard.lo' failed" so I guess the reason was lack of kernel source?
Can anyone privode any idea?
What confuse me most is the reason of lacking kernel source? : (

[DougieLawson]

You can get the kernel source from https://github.com/raspberrypi/linux

[owrjeyz]

Thanks,Must I compile the source myself and replace Installed image?

[DougieLawson]

Thanks,Must I compile the source myself and replace Installed image?

https://wiki.gentoo.org/wiki/Raspberry_Pi

[owrjeyz]

Yeah,I know the guide :） ，but I am not sure if it's necessary to compile a new kernel rather than get the /usr/src/linux->source for the running kernel

[jjackowski]

In case anyone else is still reading this thread, I keep seeing this and it has never been a problem. I put Gentoo on a Raspberry Pi maybe a couple years ago, and more recently on a 2B. I do build the kernel, but on another much faster computer. I do not move the kernel source over to the Raspberry Pi, but I do build everything I install on a Raspberry Pi with some help from distcc. These messages about the kernel source do show up regularly, but I keep ignoring them and nothing bad happens that I can attribute to lacking the kernel source.

[heder]

I has problems compiling omapfb with the same errors. I has the kernel source and everything correct, yet the problem still occured.

I did a manual ebuild of the omapfb package, in the the middle of that process I patched all those
files that could compile. I added #include <xorg-server.h> to all the files that can't compile.

It's a old issue, and how it got back in there is a mistery to me.

Alternativly you could remove the omapfb from the X use flags (portage) when compilin, that should also work

[EvadingGrid]

I solved these issues by :

Using another computer with Git to pull in a pre-compiled Kernel and matching Source Code.
Then copied it all across to the Raspberry.

compiling git on the raspberry caused problems, which is why I did it on another computer.

The omap and other useless drivers problems can be solved by USE=" - video_not_wanted " like so :

USE=" -video_cards_omap -video_cards_omapfb -video_cards_exynos -video_cards_freedreno -video_cards_tegra"