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+A notes for developers (might be outdated):
+-------------------------------------------
+
+Requirements:
+
+  - git, python
+  - STLinux 2.4 (all-sh4-glibc) - http://www.stlinux.com - installed to /opt/STM/STLinux-2.4/
+  - fakeroot package/tools
+
+Compilation:
+
+  - just type 'make'
+  - kernel with rootfs is in kernel/arch/sh/boot/uImage.gz
+
+Booting uImage.gz on Inverto IDL-400S/Grundig GSS.BOX/Telestar Digibit R1 from USB:
+
+  - connect TTL USB serial adapter to J3 connector (4 pins at the power supply)
+    - pin 1 = 3.6V (do not use), pin 2 = GND, pin 3 = RXD (STM CPU), pin 4 = TXD (STM CPU)
+    - parameters: 115200,8N1
+  - press 'Enter' when you turn on the box (you have only one second) to get 'idl4k> ' prompt
+    (it seems that 'Enter' is required also to enable the serial console)
+  - modify bootargs (optional - for original firmware)
+
+  set bootargs=console=ttyAS0,115200
+
+  - set debugfw environment variable
+
+  set debugfw "debugfw=usb start;usb start;fatload usb 0 0x84000000 uimage.gz;set bootargs console=ttyAS0,115200 bigphysarea=20000;bootm 0x84000000"
+
+  - you may type 'save' to store this settings permanently
+  - to execute the debugfw type 'run debugfw'
+  - note that the USB stick should be in the first (upper) USB connector
+
+Configuration
+
+  - dhcp client, telnetd, dropbear (ssh daemon) and minisatip are active by default
+  - configuration is stored in /etc/sysconfig/config