[lug] Adding kernel driver to a raspberry pi.

[Stephen Queen]

Have you run depmod -a after installing the modules?


On Mon, Jan 11, 2016 at 1:10 PM, <stimits at comcast.net> wrote:

> I don't have an RPI, but during kernel config and compile there is a
> parameter CONFIG_LOCALVERSION. The kernel itself has part of the version
> information built in, but the final full version concatenates
> CONFIG_LOCALVERSION. The result of "uname -r" is the base kernel version
> from the source, plus the CONFIG_LOCALVERSION. Modules are searched for in
> "/lib/modules/$(uname -r)". From what you've shown, it appears "4.1.13" is
> the base version, and "*+*-v7" or "-v7*+*" is the CONFIG_LOCALVERSION.
> CONFIG_LOCALVERSION between the two does not match, thus modules are
> searched for in different locations.
>
> Under make menuconfig you would go into "General setup --->", and see
> "Local version...". Or you can edit .config directly.
>
>
> ----- Original Message -----
> From: Jonathan Eidsness <jonathan.eidsness at gmail.com>
> To: lug at lug.boulder.co.us
> Sent: Mon, 11 Jan 2016 19:52:59 -0000 (UTC)
> Subject: [lug] Adding kernel driver to a raspberry pi.
> Hi,
> I'm trying to compile and install a new device driver on a raspberry pi
> and I'm having some issues at the end of the process.
> My build process starts from a fresh install of raspbian jessie lite and
> from there I:
> 1. Install gcc-4.8 to match the kernel's compiler
> 2. Use rpi-source (https://github.com/notro/rpi-source) to get the source
> that isn't included in raspbian,
> 3. Apply a patch for the driver to the source
> 4. Copy the config from the kernel
> 5. Run make modules_prepare and enable the driver as a module in the config
> 6. Compile and install the driver
> All that seems to work out just fine, but when I try to enable the driver
> with modprobe I get "modprobe: FATAL: Module ad5592r not found.".
> One thing I've noticed is that the .ko objects are installed
> into /lib/modules/4.1.13+-v7/extra which differs from what "uname -r"
> returns (4.1.13-v7+). Moving the objects over to the directory matching the
> running kernel doesn't fix the problem.
> Does anyone have any ideas on getting this working?
> Jonathan Eidsness
> 303-725-0215
>
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