IT WORKS !!!

I used your setup :

++Micro USB Cable (Samung one) = Success !!

I read on USB OTG for N8XX, that the converter
I used before, already integrates OTG.

After the boot crash that I had, eventhough I choose 2.6.28-hostmode1 in the multiboot menu, after the uname -a command, the output is 2.6.28-kernelpower40.
So I booted on the kernel 2.6.28-omap1 and just reinstalled the 3 kernel package you provided in the correct order.
Then I could boot the 2.6.28-hostmode1 kernel.

And Finally Thanks a lot for the job achieved ! It is awesome !

Nerfiaux