Moved serial console page from wiki to website

German translation is still missing.

docs/en/advanced/serial-console.md

@@ -0,0 +1,78 @@
+---
+nav-title: Serial Console
+nav-pos: 3
+---
+
+You can display the serial console from the TXT controler with a USB to TTL adapter. In the following example, a USB to TTL adapter with the chip CP2102 was used. Alternatively you could use an adapter with FT232 chip or similar. It is important that the adapters work on a 3.3 volt basis. First, you should plug the adapter into the desktop PC and check whether there are only 3.3 V between GND <-> RX or GND <-> TX. With 5 volts, the txt controller would be damaged.
+
+The EXT interface from the controller is occupied as follows:
+
+```
+  RX
+  | reserved
+  | | I2C-Data
+  | | | Extension
+  | | | | GND
+  | | | | |
+  | +–––+ |
++–––+   +–––+
+| O O O O O |
+| O O O O O |
++–––––––––––+
+  | | | | |
+  | | | | Extension
+  | | | Extension
+  | | I2C-Clock
+  | reserved
+  TX
+```
+
+When wiring, make sure that RX and TX are cross-connected:
+
+* TX <-> RX
+* RX <-> TX
+* GND <-> GND
+
+Then the console can be opened with the OSX as follows:
+
+`screen /dev/tty.SLAB_USBtoUART 115200`
+
+Access with [other operating systems](https://wiki.onion.io/Tutorials/Connecting-to-Omega-via-Serial-Terminal) is also possible.
+
+Finally, the TXT can be turned on and you can see the boot process.
+
+```
+U-Boot SPL 2013.10 (Jul 04 2015 - 08:30:17)
+>>> I2C0 On
+Could not probe the EEPROM; something fundamentally wrong on the I2C bus.
+Could not get board ID.
+>>> setup_dplls vor do_setup_dpll
+>>> setup_dplls nach do_setup_dpll
+Could not probe the EEPROM; something fundamentally wrong on the I2C bus.
+Could not get board ID.
+>>> Setting MUX Start
+>>> Setting MUX End
+Could not probe the EEPROM; something fundamentally wrong on the I2C bus.
+Could not get board ID.
+>>>Start TXT-Mode - V2
+LCD-Init_4: 
+Could not probe the EEPROM; something fundamentally wrong on the I2C bus.
+Could not get board ID.
+---> MPU 600 VDD 46 
+
+U-Boot 2013.10 (Jul 04 2015 - 08:30:17)
+
+I2C:   ready
+DRAM:  256 MiB
+NAND:  128 MiB
+MMC:   OMAP SD/MMC: 0, OMAP SD/MMC: 1
+Could not probe the EEPROM; something fundamentally wrong on the I2C bus.
+Could not get board ID.
+Net:   usb_ether
+
+NAND read: device 0 offset 0x700000, size 0x40000
+ 262144 bytes read: OK
+CopyToLcd
+LCD Command called
+Hit ENTER key to stop autoboot:  0 
+```