So, I got Keil MDK v5.18 (the last one available for WindowsXP/32bit)
and I was able to import the Infineon's packages, including examples
unfortunately now the tool says that I need a special license among the following
MDK-PRO MDK Professional Edition
MDK-PRO-T MDK Professional 1 year term
MDK-PRO-FL MDK Professional Edition Floating
Currently I have a MDK-ARM-FL MDK Standard Edition Floating, and the compiler refuses to use the special blocks requested by Infineon's Packages
In short: I can compile a "led blinking" example (since I can directly address a gpio easily), but I can't compiler examples that use Ethernet, SD, Cordic-Engine, etc, those parts are pre-compiled-binaries and require a special license
The alternative sounds like writing everything from scratch, assembly, C, the whole BSP and drivers, which is of course possible but it's a very time consuming activity