Now when I finally started to look into booting Nemo on my N9, I realised that of course it is using an own kernel unlike Nitdroid which runs the N9 modified kernel with different runtime setup.

The way Nitdroid/Harmattan boot selection with evtap/sillyboot is set up is that the OS selection is done after the basic kernel bootup, but before init to OS is started.

Now with Nemo this is different. From what I have read from FAQ's it is required that N9 bootloader is replaced with a different custom bootloader that can be used to select the OS with volume keypress, just like original evkey/sillyboot selection.

Now, if I want to have graphical touchtap selection of the OS, I need to integrate that to the bootloader.

If I have understood correctly, the bootloader consists of the moslo files (initrd-moslo, moslo.img, zImage-moslo) that are extracted from the OP's mentioned RPM package.

Where can I find the detailed boot process explanation, and is the moslo loader modifiable so that I could integrate graphical selection to it?