Hello!
I am using u-boot on a pocketbeagle which, according to "Default Device
Tree for DT control" in `bitbake -c menuconfig u-boot`, uses am335x-evm,
which I understand is the file
in
./build/tmp/work/pocketbeagle-poky-linux-gnueabi/u-boot/1_2020.07-r0/git/arch/arm/dts/am335x-evm.dts.
My issue is that this file ends up setting usb1 as `dr_mode = "host"` and
usb0 as `dr_mode = "otg"`. I would like to use fastboot on my pocketbeagle,
and therefore set them to `dr_mode = "peripheral"`.
In order to do that, I wrote a .bbappend that does the following:
```
FILESEXTRAPATHS_prepend := "${THISDIR}/files:"
SRC_URI += "file://am335x-evm.dts.patch"
SRC_URI += "file://logging.cfg"
```
The patch sets both usb0 and usb1 to `dr_mode = "peripheral"`, while the
cfg enables logging in u-boot. Because logging is effectively enabled, I
get that my .bbappend is used. And I can confirm
that
./build/tmp/work/pocketbeagle-poky-linux-gnueabi/u-boot/1_2020.07-r0/git/arch/arm/dts/am335x-evm.dts
is patched indeed.
However, whatever I do, I can't seem to get that modification in my u-boot
device tree at runtime, as usb0 always ends up as "otg" and usb1 as "host".
I have even tried a full clean build where I removed build/tmp and
cache_sstate.
I cannot really tell if my patched file is actually used or not. For
instance, if I `bitbake -c cleansstate u-boot`, then `bitbake -c do_patch
u-boot`, then `rm
-rf
./build/tmp/work/pocketbeagle-poky-linux-gnueabi/u-boot/1_2020.07-r0/git/arch/arm/dts`
and finally `bitbake u-boot`, it does not complain at all about a missing
dts file.
What am I missing, and how could I make sure that my patched am335x-evm.dts
is the device tree being used by my u-boot install?
Best Regards,
Jonas
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