-- Jumping to (the built-in) bootloaders on STM32 works, but it is not entirely pleasant, since it is very much MCU dependent. So, one needs to dig out the right address to jump to, and either pass it to the compiler in the `Makefile`, or better, define it in `<your_kb>/bootloader_defs.h`. Also, a patch to upstream ChibiOS is needed (supplied), because it `ResetHandler` needs adjusting.
-- Sleep LED works, but at the moment only on/off, i.e. no breathing.
+- Jumping to (the built-in) bootloaders on STM32 works, but it is not entirely pleasant, since it is very much MCU dependent. So, one needs to dig out the right address to jump to, and either pass it to the compiler in the `Makefile`, or better, define it in `<your_kb>/bootloader_defs.h`. An additional startup code is also needed; the best way to deal with this is to define custom board files. (Example forthcoming.)
+
+### Experimental pre-ChibiOS 4 support
+- As an alternative to the mentioned flabbergast branch above, you can use the [master branch of ChibiOS](https://github.com/ChibiOS/ChibiOS).
+- Note that the Kinetis support has moved to the [ChibiOS-Contrib repository](https://github.com/ChibiOS/ChibiOS-Contrib), so you need to put that into your repository in the same way as you did for the main ChibiOS repository.
+- You also need to define CHIBIOS_CONTRIB in your makefile and point it to the right directory.
+- You need to add some new options to chconf.h, or you will get compiler errors. Just copy the new options from samples provided by the ChibiOS-Contrib repository.