Hey everyone
I have a project that uses BBG and a customized cape with antenna to sniff
wireless packets.
It worked okay with the old kernel from 2017, but it had some bugs of
dropping packets if the packet rate was too high.
After some debugging, I thought the bug was located in the kernel driver
level and I thought about upgrading it the latest one and try again.
I have successfully upgraded the kernel and I tried to initialize the
cape(sniffer) as below. However, after initialization, BBG won't boot up
with the cape on top.(If it is removed, BBG can boot up as normal)
function setup_sniffer(){ sed -i -e
"s:enable_uboot_cape_universal=1:#enable_uboot_cape_universal=1:g"
/boot/uEnv.txt sed -i -e
"s:enable_uboot_overlays=1:#enable_uboot_overlays=1:g" /boot/uEnv.txt sed -i
-e "s:#dtb=:dtb=am335x-bonegreen-overlay-NI2C2.dtb:g" /boot/uEnv.txt dtc -I
dts /home/debian/dtree/blobs/am335x-bonegreen-overlay-ni2i2.dts -O dtb -o
/boot/dtbs/4.19.94-ti-r42/am335x-bonegreen-overlay-ni2c2.dtb
cd /home/debian/driver make clean make cd /home/debian/dtree
./load_all.sh cd /home/debian}
In load_all.sh, it loads all the DT files.
#!/bin/bashFILES=/home/debian/dtree/src/*for f in $FILESdo if [[ $f == *dts ]]
then echo "Compiling $f ..." filename=$(basename $f .dts)
capename=$(basename $filename -00A0) dtc -o
/home/debian/dtree/blobs/$(basename $f .dts).dtbo -b 0 -@ $f cp
/home/debian/dtree/blobs/$(basename $f .dts).dtbo /lib/firmware fi
done
All the .dts files I used is put here
<https://drive.google.com/drive/folders/16bqKP-CdxS7bkTwO3uzM7JsGJ5O0A1w3?usp=sharing>
After some investigation, the main problem could be the latest kernel
doesn't support overlays
<https://github.com/adafruit/adafruit-beaglebone-io-python/issues/291> any
more.
It used to load directly from the right overlay, now this needs to be done
in uboot.
I don't have the eeprom for providing default cap configuration and this
may make detection by uboot difficult.
Do you know how to create a customized u-boot that is loaded with the cape
information?
Thank you in advance
BR/Marco
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