Hi! I ran the USB SDD upgrade as per the Jetson Hacks instructions. All is well and good until I try to update the DTB via jetson-io to use hardware pwm and it doesn’t ever get updated. Prior to an SSD upgrade I’ve gotten this to work. I read here that: Creates a new DTB or Device Tree overlay (DT…

[image] lackdaz: Is there some way I can still use my custom dtb with arducam’s?. if I understand correctly, you would like to modify pins 32, 33 as PWM. you could disassembler the original dtb file into text file for customization, $ dtc -I dtb -O dts -o results.dts tegra210.dtb then, con…

[image] WayneWWW: Just wonder why it doesn’t work. Your extlinux.conf has the LABEL JetsonIO and it is using tegra210-p3448-0000-p3449-0000-b00-user-custom.dtb. it could be the path to the file is wrong, the rootfs is actually on my usb HDD.

Hi, Yes, it sounds reasonable. I guess we didn’t verify jetson-io with external storage. Where is this extlinux.conf located? Is it on usb hdd or emmc? I guess currently your kernel image is still loading from sdcard. But I am not sure about the dtb. Your uboot log should tell us which path is …

Its on the USB HDD, I’m still using the devkit and I don’t believe there’s emmc (that’s the 16gb on the production module) Does running running jetson-io override my modified extlinux.conf? It previously had a custom kernel to boot form USB. Is there a good way to capture uboot logs? I can probabl…

Hi, Sorry, I modified my comment to sdcard. The uboot log could be captured by serial console. I guess it is using kernel on sdcard because IIRC uboot does not support usb at all.

yeah I’m using an initrd-xusb.img on my sd /boot but it isn’t reflected in my extlinux.conf. I’m guessing that jetson-io overwrites the extlinux.conf file. I’ll poke my ftdi serial programmer and post the uboot logs Ok back to the original question, how can I flash the pins via -k. Most of my root…

You may notice the original extlinux.conf does not have DTB field because the dtb could be read from either partition or rootfs. Below command could flash the dtb to DTB partition. sudo ./flash.sh -r -k DTB board_name mmcblk0p1 (or sdx1 if you are using usb hdd)

[image] WayneWWW: sudo ./flash.sh -r -k DTB board_name mmcblk0p1 (or sdx1 if you are using usb hdd) Got it. Let me test those out on a mint OS and I’ll post the changes.

Left some comment on your jetson-io post. You could check that part too.

Hi I just want to update that I managed to update the DTB using the bootloader instead. I tried the flash.h methods from an ubuntu host machine but was unable to get the DTB flashed. Upon trying jetson-nano-qspi-sd instead of just the qspi the flash failed and I had to restart from scratch. Here i…

So to revive this thread I started messing about with the arducam and that requires its own custom image/kernel. @WayneWWW I’ve tried declaring multiple device trees on the uboot but that didn’t work. Is there some way I can still use my custom dtb with arducam’s?. To be clear, I’m just modifying…

Updating the DTB while running on usb boot

Robotics & Edge Computing Jetson Systems Jetson Nano

lackdaz June 10, 2020, 11:33am 12

Got it. Let me test those out on a mint OS and I’ll post the changes.

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Updating the DTB while running on usb boot

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