How to detect board flash size, MCU code name, revision and bootloader version

ArduCopter Copter 4.0
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1

this post will describe how to detect board flash size and MCU code name and revision in 3 ways

How to find FMU version :
you can find your boards FMU version with this table :

Screenshot_6
Screenshot_6850Ă—546 30.6 KB

source

How to detect flash size and MCU code name :

Option 1 (this way shows flash size, bootloader version and FMU version) (most easy way) :
1-open QGroundControl and go to setting --> firmware

Screenshot_7
Screenshot_71352Ă—819 28.9 KB

2-connect your FC via USB cable
now you can see flash size, bootloader version and FMU version
firmware_select_default_px4
firmware_select_default_px41011Ă—519 64.1 KB

Option 2 (this way only shows MCU code name) :
1- first you need to upload a firmware with Nuttx OS (this option will not work on ChibiOS)
for example i was uploaded AP3.6

2-open mission planner and connect your FC go to Setup menu then go to Advance and click on Terminal

Screenshot_8
Screenshot_81220Ă—761 50.5 KB

3-now chose NSH from drop down menu and click on Connect

Screenshot_9
Screenshot_91219Ă—760 48.2 KB

4-in this step you must type “ver all” quickly before new messages comming
by typing “ver all” you will get a result like this
in this section you can see MCU code name

40081525-8ad166bc-588e-11e8-86dc-13fd283f373a
40081525-8ad166bc-588e-11e8-86dc-13fd283f373a1372Ă—646 128 KB

also if you were on a 1m flash will see a “warning warning warning warning warning” message
source

Option 3 (open Pixhawk and check the revision of the main processor) :

by opening your pixhawk you can physically see your MCU revision and search for datasheet to get complete information of it
If it is RevA, RevY and Rev1 then you have an 1M board, other (most likely Rev3) is 2M.

STMrev.
STMrev.1103Ă—367 106 KB

at the end if you have 1m flash size select Pixhawk1-1m else select Pixhawk 1 or decide by your FMU version

2

I’m not convinced by option 1. Is “FMU version” the same as the “revision”?

3

No
FMU is Flight Management Unit so fmuv2 is meaning that Flight Management Unit Version 2
MCU revision is the generation of the main processor

4

In option 1 you cannot tell the CPU revision. I thought the whole point of the CPU bug is that the CPU thinks it has 2MB of flash but just has 1? i.e you must read the CPU revision to know if the bug is present and option 1 does not provide that information (I think…).

5

This is what it tells you:

Pixhawk VIT6-1 (1Mb)
1Mb

Pixhawk VIT6-3 (2Mb)
2Mb

1 Like
6

As mentioned in main post option 1 is only shows flash size and bootloader version

7

Thanks for clearing that up @dkemxr . So however the bug manifests itself, QGroundControl is able to tell the true amount of flash memory that the CPU has. :slight_smile: