JetPack 6: How can I access the fuse state of a SOM from the device itself?

[tschoop]

Hi.
I am migrating from JetPack 5 to JetPack 6. In our device I used a read access on "/sys/devices/platform/efuse-burn/public_key" in order to check if the device is fused or not. Now in JP6 I do not find this node and I also searched through linux-jammy-nvidia-tegra but I could not find efuse-burn module nor anything similar. What is the way to check the fuse state from within the device when running on Linux kernel v5.15?

[madisongh]

It's exported as an nvmem device. I recently discovered that NVIDIA provides a script called nv_fuse_read.sh in the L4T kit (specifically the nvidia-l4t-tools deb package) that will parse values from there. I haven't actually played with it yet, but that might help.

[tschoop]

Thanks for the quick pointer. I will give it a try.