smealum, the sexy cool dude who brought us open source Homebrew to our 3DS’s has released some tools for the Wii U, here is a quote from the source:
this repo contains some of the tools I wrote when working on the wii u. iosuhax is essentially a set of patches for IOSU which provides extra features which can be useful for developers. I’m releasing this because I haven’t really touched it since the beginning of january and don’t plan on getting back to it.
iosuhax does not contain any exploits or information about vulns o anything. just a custom firmware kind of thing.
iosuhax current only supports fw 5.5.x i think.
i wrote all the code here but iosuhax would not have been possible without the support of plutoo, yellows8, naehrwert and derrek.
iosuhax is pretty barebones, it’s mainly just the following :
software nand dumping (bunch of ways to do this, dumps slc, slccmpt and mlc, either raw or filetree or something in between)
redNAND (redirection of nand read/writes to SD card instead of actual NAND chips)
remote shell for development and experimentation (cf wupserver and wupclient, it’s super useful)
some basic ARM debugging stuff (guru meditation screen)