Activate CoreSight on DragonBoard 410c
I am poor and all Juno Boards in our lab are under use of fuzzing (leave fuzzing away).
So I have to buy a cheap board with CoreSight support, with lab funding.
BTW, welcome to take a look at my blog, it is almost all in Chinese.
Feel free to ask me if you have any question, luhy2017 [at] mail [dot] sustech [dot] edu [dot] cn
Relevant Resources
Kernel Download
- Clone kernel repository from Linaro (If you’re in China, use American proxy)
git clone http://git.linaro.org/landing-teams/working/qualcomm/kernel.git
- Configure Kernel
Find all CoreSight related configuration and turn them on.
cd kernel
# Important, choose official distribution
git checkout origin/release/qcomlt-5.15
# Important, otherwise available .config is different
export ARCH=arm64
export CROSS_COMPILE=aarch64-none-linux-gnu-
# Configure
make defconfig
make menuconfig
Basically, all related configurations is in Kernel hacking -> arm64 Debugging -> CoreSight Tracing Support
- Compile Kernel
make -j$(nproc) Image.gz dtbs
make -j$(nproc) modules
- Make Image
cat arch/$ARCH/boot/Image.gz arch/$ARCH/boot/dts/qcom/apq8016-sbc.dtb > Image.gz+dtb
echo "not a ramdisk" > ramdisk.img
# Change the `root=/dev/mmcblkXpX` to our rootfs, default is `mmcblk0p14`
# If not sure, find them in Linux booting log
abootimg --create boot-db410c.img -k Image.gz+dtb -r ramdisk.img \
-c pagesize=2048 -c kerneladdr=0x80008000 -c ramdiskaddr=0x81000000 \
-c cmdline="root=/dev/mmcblk0p10 rw rootwait console=tty0 console=ttyMSM0,115200n8"
- Flash Kernel Image
fastboot flash boot boot-db410c.img
- Install Modules
Because we updated the kernel, it is likely that our modules need updating too.
# In kernel directory
mkdir db410c-modules
make modules_install INSTALL_MOD_PATH=./db410c-modules
Move the content in the folder into /lib/modules.
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Details
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Insert SD Card will effect the name of
rootfsand cause boot failure, remove it before booting. -
During my test, booting may fail, try boot again.
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Results
We can see ETM components in /sys/bus/coresight/devices
root@linaro-developer:~# ls /sys/bus/coresight/devices/
cti_cpu0 cti_cpu2 cti_sys0 etm0 etm2 funnel0 replicator0 tmc_etf0 tpiu0
cti_cpu1 cti_cpu3 cti_sys1 etm1 etm3 funnel1 stm0 tmc_etr0
