SKR3 V3 Problem 'ls /dev/serial/by-id/`

General Discussion
1

Basic Information:

Printer Model: Alfawise u20
MCU / Printerboard: SKR3 V3 STM32H723
klippy.log

Description :

Hey everyone,

I’ve got an SKR3 board, and I feel like the millionth person facing issues with it. Here’s the situation:

I followed the standard flashing process with the .bin file, but ran into problems at a key point.

Issue 1:

When I flash the stock firmware-usb.bin from the official GitHub repo, everything goes smoothly.
The file changes to FIRMWARE.cur, and the status LED turns off as expected.

However, when I try flashing Klipper (after renaming it to firmware.bin), the status LED never turns off.
The file gets renamed to : FIRMWARE.cur, but something’s still wrong, and the board doesn’t seem to complete the process.

Issue 2:

Assuming the flashing with the original file worked, I tried moving forward.
I used the command ls /dev/serial/by-id/ to check for the device, but it doesn’t seem to exist.
When I ran ls /dev, there’s no “serial” listed either.

Here’s what I’ve already tried:

  1. Swapped USB cables and confirmed the one I’m using supports data transfer.
  2. Checked the Raspberry Pi’s USB ports with other devices—no issues there; they’re detected with lsusb. The only thing not showing up is the SKR3.
  3. Confirmed that the CAN/USB switch is in the correct (released) position.

At this point, I gave up on USB and tried connecting the SKR3 to the Pi via UART:

  • PA10 > GPIO15
  • PA9 > GPIO14
  • GND > GND

Even with the .bin file from GitHub, it didn’t work.

Does anyone have any suggestions on what to try next? I’d appreciate any help!

2

Please check what kind of MCU is actually used on your board. It seems that BTT is silently shipping two different variants:

  • STM32H723
  • STM32H743

While both seem “pin compatible”, i.e. the settings in the printer.cfg are the same, they need different handling during make menuconfig.

3

Hello friend ,
yes that’s correct, mine is 723

4

Please be very precise with the board you have. There is:

5

aef7399a-6dd0-4626-8cd4-c880f0011cce
aef7399a-6dd0-4626-8cd4-c880f0011cce1920×864 197 KB

no, as mentioned it’s a BBT SKR 3

additional information :
i tried what was mentioned here Provide support/documentation for STM32H723 variant · Issue #48 · bigtreetech/SKR-3 (github.com)
but with no success

6

Try following settings:

grafik
grafik874×296 11.1 KB

Copy the firmware.bin to a SD card and reboot the board.

1 Like
7

Great news—
everything is working now! I’d like to share what I did in case it helps someone else.
To summarize, I found myself stuck in DFU mode for reasons I still don’t understand, which caused the LED status to remain on.
I generated the .bin file and successfully loaded it using the STM32 programmer, as shown in picture “a5.”

a4
a4872×992 79.3 KB

a5
a51195×688 65.6 KB

8

Good job.
So the above firmware config worked?