Wow, thank you Robert for the super quick answer :-)
A short question before I'll read and delve into more depth about the
subject:
I have noticed during the boot process, the beagleboard-xM (rev B) prints
on screen:
"reading /dtbs/omap3-beagle-xm-ab.dtb
60695 bytes read in 13 ms (4.5 MiB/s)
## Error: "expansion_args" not defined
Kernel image @ 0x80300000 [ 0x000000 - 0x3e2f38 ]
## Flattened Device Tree blob at 815f0000
Booting using the fdt blob at 0x815f0000
Using Device Tree in place at 815f0000, end 81601d16
Starting kernel .."
So I searched for the omap3-beagle-xm-ab.dts (on linux_kernel-3.14.4
source) in order to modify it. but couldn't find it, found only
omap3-beagle-xm.dts
googled and found only this skinny file: omap3-beagle-xm-ab.dts, which
contains:
/include/ "omap3-beagle-xm.dts"
/* On Rev A/B USBHOST_PWR_EN is active high */
&hsusb2_power {
enable-active-high;
};
Is it the correct file? which I should:
1) modify
2) compile it to dtb
3) overwrite the exist file in /boot/uboot/dtbs/omap3-beagle-xm-ab.dtb
Thank you again.
Have a great week!
On Wednesday, May 14, 2014 3:50:14 PM UTC+3, RobertCNelson wrote:
>
> On Tue, May 13, 2014 at 6:41 PM, <[email protected] <javascript:>>
> wrote:
> >
> > Hi There,
> > I have recently took my Beagleboard-xM and put on it the Ubuntu 14.04
> LTS
> > (3.14.2-armv7-x5),
> > then I tried to mux PIn3 (GPIO_139), after reading thoroughly the pages
> from
> > both the "System Reference Manual"(Page 110) and the "Technical
> Reference
> > Manual" of the processor (Pages 2444-2453).
> > So I wrote the dts file and compiled it via dtc.
> >
> > but now I got stuck how do I apply the changes on runtime?
> >
> > I saw on the beaglebone there is a slots file (/sys/devices/.../slots)
> which
> > was triggering the change,
> > after we echoed to it the dtbo file. but in my case we are talking about
> > beagleboard-xM which there is no such kind of file.
> > can someone elaborate what should I do?
>
> Modify the base dtb file, the capemgr wasn't ported to the xM. When
> overlay's hit mainline we will visit this again.
>
> Regards,
>
>
> --
> Robert Nelson
> http://www.rcn-ee.com/
>
--
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