Differences

This shows you the differences between two versions of the page.

--- debug_port [2025/05/04 18:24] – ounsatn
+++ debug_port [2025/05/04 18:54] (current) – ounsatn
@@ Line 1: / Line 1: @@
-To get console access via UART on Akai devices you have to proceed like on the pictures below
+To get console access via UART on Akai devices you have to proceed like on the pictures below :
+{{http://dnttalo.cluster029.hosting.ovh.net/Pictures/Uart/AKF_UART.png}}
 On my AKF i have 6 pins, sometimes on MPC there is less pins.
@@ Line 6: / Line 9: @@
 [[https://www.amazon.fr/QIQIAZI-UART-TTL-Adaptateur-convertisseur-compatible/dp/B0DBHM62GM/|USB-TTL Converter]]
 Connect like this :
-*GND from Akf to GND on usb stick,
-*Rx from Akf to Tx on usb stick
+- GND from Akf to GND on usb stick
-*Tx from Akf to Rx on usb stick
+(you can measure gnd when running with a voltmeter), if you have 0v between measuring point and the gnd, there is a big change that the measuring point is a gnd.
+- Rx from Akf to Tx on usb stick
+- Tx from Akf to Rx on usb stick
+**/!\ Do not connect Pins 5v or 3.3v**
+Connect USB dongle to your computer.
+Connect USB type B on force to the same computer ( if you dont do this, you can have inconsistent messages when sending commands or receiving messages in the console application).
+Then when its done, download putty and run it.
+In session choose Serial and adjust Com1 port to the port used by your USB/TTL converter.
+On my side its often COM6, COM4 or  COM7.
+Change speed on 115200, and click Open.
+I wrong port has been chosen you will have an error message.
+Otherwise you'll have black screen.
+Then power on your force and Uboot prompt & start will appear.
+Let linux boot then you will see login prompt (force login:), waiting for you to login.
+If you have already a firwmare with ssh enabled, you can log like this on your device.
+Otherwise if you dont have the login, you'll have to go into uboot console.
+To do this and just after booting your device, there is a quick message allowing you to interrupt boot process.
+{{http://dnttalo.cluster029.hosting.ovh.net/Pictures/Uart/AKF_Uboot.jpg}}
+So to interrupt, press space or another key few times in your putty ( console apps )
+Then you'll be on uboot prompt ( => ) .
+There you can type help to get list of all commands but be careful of what you do.
+To log into linux, as we don't have password, we are going to change it by mounting the rootfs partition and then we run passwd to change password.
+<code>
+# Under uboot, print current bootargs , UUID will be different so use the one you have.
+$>printenv bootargs
+$>bootargs=root=PARTUUID=1c5755ae-899e-475b-821b-636c4825550c rootwait ro console=ttyS2,115200 rfkill.default_state=0
+# We add "single init=/bin/sh'" to the end of the booting args with command below :
+$>setenv bootargs 'root=PARTUUID=1c5755ae-899e-475b-821b-636c4825550c rootwait ro console=ttyS2,115200 rfkill.default_state=0 single init=/bin/sh'
+# Print again to check everything is fine :
+$>printenv bootargs
+# Then boot
+$>boot
+#Remount rootfs / with read write rights :
+$>mount -rw -o remount /
+#Change password, type what you want
+$>passwd root
+#Reboot
+$>reboot -f
+</code>
+and Voila, you have a console access to your device.
-{{http://dnttalo.cluster029.hosting.ovh.net/Pictures/Uart/AKF_UART.png}}