[Arm-dev] Different issues with "DTOVERLAY".

[Pablo Sebastián Greco]

Hello Stephan, nice finding!

El 23/2/19 a las 23:00, Stephan Guilloux escribió:
> Hi Pablo,
> Found the cause for the Help problem.
> On CentOS, /boot/overlays/README is missing. It contains the help for 
> all the dtoverlay commands...
>
> I got the file from its original distro, and I put it under 
> /boot/overlays/README.rasp for the demo:
>   [pi at myrpi ~]$ dtoverlay -h i2c-gpio
>   * Help file not found
>   [pi at myrpi ~]$ sudo mv /boot/overlays/README.rasp /boot/overlays/README
>   [pi at myrpi ~]$ dtoverlay -h i2c-gpio
>   Name:   i2c-gpio
>
>   Info:   Adds support for software i2c controller on gpio pins
>
>   Usage:  dtoverlay=i2c-gpio,<param>=<val>
>
>   Params: i2c_gpio_sda            GPIO used for I2C data (default "23")
>
>           i2c_gpio_scl            GPIO used for I2C clock (default "24")
>
>           i2c_gpio_delay_us       Clock delay in microseconds
>                                  (default "2" = ~100kHz)
>
>   [pi at myrpi ~]$
>
> Unfortunatelly, the files under this folder seem to belong to no 
> package...
>   [pi at myrpi ~]$ rpm -qf /boot/overlays/i2c-gpio.dtbo
>   file /boot/overlays/i2c-gpio.dtbo is not owned by any package
>   [pi at myrpi ~]$
>
> So, I'm stuck there, for now ...
All those files are copied by the raspberrypi kernel from 
/usr/share/raspberrypi2-kernel/<version>/boot/overlays 
(https://github.com/CentOS/sig-core-AltArch/blob/master/raspberrypi2/SPECS/raspberrypi2.spec#L163) 
and that dir also contains the missing README. I'll try to update the 
spec for the next kernel update
>
>
> <snip>
>
>
Thanks for looking into this.

Pablo.
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