[meta-freescale] Confused with adding drivers to kernel via bitbake -c menuconfig

[Nikolay Dimitrov]

Hi Alvin,

On 02/06/2015 04:59 AM, Alvin D.M. DIZON wrote:
> Hello Otavio,
>
> If I set the drivers to be added as built-in, does that mean that the driver would be installed and loaded in the kernel? I ran "lsmod" and didn't see the bluetooth driver loaded. Am I missing something here?

"lsmod" lists only loaded kernel modules (.ko files under
/lib/modules/<kernelversion>). If you enable a driver as built-in, it
will be statically compiled in the kernel and won't show on "lsmod".
Better way is to look in boot messages (dmesg) to see whether the
drivers is initialized.

> ________________________________________
> From: otavio.salvador at gmail.com [otavio.salvador at gmail.com] on behalf of Otavio Salvador [otavio at ossystems.com.br]
> Sent: Thursday, February 05, 2015 7:23 PM
> To: Alvin D.M. DIZON
> Cc: meta-freescale at yoctoproject.org
> Subject: Re: [meta-freescale] Confused with adding drivers to kernel via bitbake -c menuconfig
>
> On Thu, Feb 5, 2015 at 3:42 AM, Alvin D.M. DIZON
> <adm.dizon at pciltd.com.sg> wrote:
>> I would like to the generic USB bluetooth driver "btusb" to my i.MX6Q SABRE SD, so that my USB Bluetooth dongle(Cambridge Silicon Radio). Upon reading https://community.freescale.com/docs/DOC-100847 I enabled the Bluetooth subsystem support, RFCOMM, BNEP, and HIDP, as well as the HCI USB driver. I saved the .config file and copied it to the directory where my Linux recipe is (linux-imx_3.10.17.bb). I then renamed my .config file into defconfig, made a new folder called "files" and placed the defconfig in it. I also made a .bbappend file that contained
>>
>> FILESEXTRAPATHS_prepend := "${THISDIR}/files:"
>> SRC_URI += "file://defconfig"
>>
>> I then ran "bitbake -c cleansstate linux-imx", after that I ran "bitbake fsl-image-x11". I flashed the resulting .sdcard file to an SD card, booted up my board, but found no trace of btusb. I tried doing "bitbake -f -c compile linux-imx" and then "bitbake -f -c deploy linux-imx", and copied the resulting uImage to my SD card's /media/Boot folder, but still no trace of btusb. I checked the tar archive for the kernel modules found in the /tmp/deploy/images/imx6qsabresd folder, and found two files called modules.order and modules.builtin, the btusb driver is listed in the modules.builtin file, but not mentioned in the modules.order file, I have also tried compiling the driver as module, and then ran the same commands as listed in the said link, but could not find the module. What am I doing wrong here? Any help will be will be appreciated, since I am new to Linux and the Yocto Project.
>
> You might have made it built-in, no? in this case no module will be
> generated but it will be included in the kernel.
>
> --
> Otavio Salvador                             O.S. Systems
> http://www.ossystems.com.br        http://code.ossystems.com.br
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Regards,
Nikolay