Author Topic: Help Identifying ARM SOC?  (Read 2375 times)

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Offline lavachemist

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Help Identifying ARM SOC?
« on: August 03, 2021, 04:51:05 pm »
Long time EEVblog forum lurker, but new user here...

I'm working on some hardware hacking projects with DJI FPV hardware. We are poking at the DJI/Caddx air units. The common perception is that DJI developed their own proprietary SOC for these devices. According to uname, it is an A7L, which corresponds to an Ambarella chip family, but the ballout looks different to anything I can find online. I'm curious if anyone can ID what this SOC might be, based on the BGA arrangement.

It's probably a shot in the dark, but I figured if anyone might be able to they would be on here. [attachimg=1]
« Last Edit: August 03, 2021, 05:11:53 pm by lavachemist »

Offline biot

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Re: Help Identifying ARM SOC?
« Reply #1 on: August 12, 2021, 09:24:00 pm »
According to uname, it is an A7L
That implies it's running Linux, and you have a shell on it? If so, please post the boot log.

Offline tmbinc

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Re: Help Identifying ARM SOC?
« Reply #2 on: March 03, 2022, 12:06:55 am »
FYI (I know this is an old thread but I can't leave it un-answered),

the DJI P1 is indeed a custom DJI SoC. It's basically a "clone" of the LC1860 DSP architecture (2x CEVA XC4500 + 1x CEVA-X1643), with two independent Cortex-A7 CPUs, one running the RF stack and one running Linux, with added video capture, encoding, decoding and output capabilities.

root@pigeon_wm150_tiny:/ # uname -a
Linux localhost 4.9.130-645274-g4a83e11 #1 SMP PREEMPT Tue Jun 23 04:23:20 CST 2020 armv7l
root@pigeon_wm150_tiny:/ # cat /proc/cpuinfo
processor       : 0
model name      : ARMv7 Processor rev 5 (v7l)
BogoMIPS        : 8.00
Features        : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x0
CPU part        : 0xc07
CPU revision    : 5

Hardware        : PIGEON
Revision        : 0000
Serial          : 0000000000000000

Bootlog (dmesg) attached.

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