Why Jetson Orin Nano miss ~855MB memory?

Robotics & Edge Computing Jetson & Embedded Systems Jetson Orin Nano
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I have a Jetson Orin Nano 8GB Developer Kit. When I run “tegrastats”, it only shows 7337MB memory in total.
04-28-2023 14:12:54 RAM 3799/7337MB (lfb 166x4MB) SWAP 680/36436MB (cached 14MB) CPU [0%@1510,0%@1510,0%@1510,0%@1510,0%@1510,0%@1510] EMC_FREQ 0% GR3D_FREQ 0% GR3D2_FREQ 0%@0 CV0@-256C CPU@48.062C SOC2@47.531C SOC0@45.656C CV1@-256C GPU@48.781C tj@48.781C SOC1@46.187C CV2@-256C

I think it should have 8192MB memory in total, did anyone know where are these missing 855MB memory? I’m trying to run it for my large language model, so if these missing memories are reserved by other modules, how can I get them back to me ? Thanks in advance.

3

Some memory reserve for co-operation CPU like BPMP …
Have check the reserved-memory{} in device tree.

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