Requirements:
WiiScrubber v1.40;
nfs2iso2nfs v0.5.4; it may require the Wii common Key. You can use wiiscrubber's key.bin renamed to wii_common_key.bin.
A clean rip of your Wii game;
The extracted contents of a Wii VC title for the Wii U (except the .nfs files);
-the 2 below require java to be installed-
jnustool (requires Wii U common key so you'll have to search online - hint: it begins with D7B0. Open the "config" file in notepad and paste the key inside, replacing [COMMONKEY]);
NUSpacker (must be @ihaveamac's version, requires Wii U common key as well)

Current limitations:
It's possible to use the gamepad to emulate ONLY the Classic Controller.
Wii Remote emulation is possible but there's no gyroscope or infrared commands (at least for now).
(Input emulation patches by @FIX94)

The game must be already compatible with the Classic Controller but that isn't a guarantee that it's going to work.
Here's a compatibility list: http://wiki.gbatemp.net/wiki/WiiU_VC_Wii_inject_compatibility_list

Integrity checks are still in place so only clean disc rips work.
The game iso must be pristine: untrimmed, unscrubbed and the partitions signed.
No homebrew, no mods, no wimmfi patched games until sigpatches are implemented.
Patched isos work now! Original idea by @Tock46!

Homebrew works now, even a special version of Nintendont by @FIX94

Trimmed isos still don't work, at least not isos trimmed by WiiScrubber.



HOW TO DO IT


0. Downloading a Wii VC Title
This may be illegal and I'm just telling you so you don't ever do it by mistake OK?
You can use the command line to download games' contents directly if you know the title id and title key.
I heard you can get them on a certain titlekeys site...

Once you have that, this is the command

java -jar JNUSTool.jar TITLEID TITLEKEY

Note: You should get a game that contains the latest revision of fw.img (r590), that's the only version supported by @FIX94's patches.
Here's some info you can use to verify that you have a good file:
Size: 1785497 bytes.
CRC32: E2F27E9B
MD5: 3CAF52A9A440EEE4F125A3AD22E305C8
SHA: A5A75EBF3164874830A1D5992495DE510AB3F74E

Now here's a list of some titles that contain the preferred fw.img (verified mostly by @fejich and @markehmus)
DONKEY KONG JUNGLE BEAT [VBXE01]
Kirby's Epic Yarn [VARE01]
Lost in Shadow [VA8E01]
Mario Strikers Charged [VBFE01]
Mario Super Sluggers [VBHE01]
Pandora's Tower [VAPE01]
PIKMIN 2 [VBTE01]
PIKMIN [VBUE01]
Resident Evil 4 Wii Edition [VBDE01]
Resident Evil The Umbrella Chronicles [VBWE01]
Rhythm Heaven Fever [VAKE01]
Sin and Punishment Star Successor [VALE01]
Super Mario Galaxy [VBKJ01]
Super Paper Mario [VBBE01]
The Legend of Zelda Skyward Sword [VANE01]
Trauma Team [VA6E01]
Wario Land Shake It [VBGE01]
WARIO WARE SMOOTH MOVES [VBVE01]





-----------------------------------------------

1. WiiScrubber
First setup WiiScrubber. Remember it needs the Wii common keys so run MakeKeyBin.exe first and do as it says.
Run it and open you iso. Right-click the UPDATE partition and select "Delete partition". Confirm.

Now click on the + box to expand the DATA partition, then expand partition.bin.
Right click tmd.bin, select "Extract" and save it.
Do the same with ticket.bin.

Rename the extracted ticket.bin to rvlt.tik
Rename the extracted tmd.bin to rvlt.tmd

Copy/move both files to the "code" folder of the Wii VC title.

Your iso is now ready and you can close WiiScrubber.


2. nfs2iso2nfs
Move your iso to the "content" folder of the Wii VC. Rename the file to "game.iso".
The content folder should contain only game.iso and the "assets" folder. Delete any nfs files that are still present.

Copy nfs2iso2nfs.exe to the content folder and run it. If everything is in place, it will begin the conversion process.
It should take around 15 minutes. Its console window will close when it's finished.
Once it ends you can delete your iso file and nfs2iso2nfs.exe (and wii_common_key.bin if it exists).
The content folder should contain only the nfs files and the "assets" folder.

Optional: You can enable Classic Controller emulation for playing using only the gamepad.
Open meta.xml (it's in the meta folder) in notepad.
Look for the line

<drc_use type="unsignedInt" length="4">1</drc_use>

replace it with

<drc_use type="unsignedInt" length="4">65537</drc_use>

and save the file.
Note that this will only work if the game supports the Classic Controller.
If it doesn't either it won't boot or you won't be able to do anything and only the gamepad's power button will work.
Here's a list of such games: https://wiki.gbatemp.net/wiki/List_of_Wii_games_compatible_with_Classic_Controller


3.NUSpacker
The final part, building the installation files.
NUSpacker requires the Wii U common key. You should find it online and then open the file "encryptKeyWith" with
notepad and paste the key inside (hint: it begins with D7B0)

It's also a command line tool so you'll have to write down the commands, or simply create a new text file,
write the command inside, save it and change the extension from .txt to .bat

I recommend copying the Wii VC folder (that contains the other 3 folders, code, content and meta) to nuspacker's folder.
That will make everything easier.

The command works like this (replace with the names of your own folders)
If you folders have spaces in their names, enclose them in quotation marks, like "Just Dance".

java -jar nuspacker.jar -in GAME_FOLDER -out INSTALATION_FILES_FOLDER

Wiait until it finishes the process.
Now just copy the folder with the installation data to the "install" folder SD card, run a CFW and install it with WUP Installer GX2!

PS: If you make a nonfunctional game, remember to uninstall it before trying again.
If you install a fiunctional game over a broken installation, it will still appear as broken.

 

[ploggy]

How do you resign (with truncha) an iso after editing it?

 

[Columbo2811]

Getting a really weird problem now, was testing Fire Emblem and using the Gamepad as a Classic Controller doesn't quite work. It detects it as if it's a wiimote, which means up/down/left/right is mapped instead to left/right/up/down, X and Y are 1 and 2 respectively A and B are A and B, and no other buttons work except + and -. Anyone else getting this issue and know a possible fix? The meta.xml is as it should be,
<drc_use type="unsignedInt" length="4">65537</drc_use>

It's because that game is supposed to use wiimote held sideways. That's why the inputs are off. Is there an option in settings to change it to classic controller?

 

[Saiklex]

It's because that game is supposed to use wiimote held sideways. That's why the inputs are off

Yeah, I understand that, but it should be recognizing the Gamepad as a classic controller, of which this game is fully compatible with, shouldn't it?

Edit: Checked settings, no such option, and tried it with a real Classic Controller, and the button prompts all change, so it's not seeing the gamepad as a classic controller at all

 

[Columbo2811]

Yeah, I understand that, but it should be recognizing the Gamepad as a classic controller, of which this game is fully compatible with, shouldn't it?

I edited my post. I had that problem with a game and there was a setting in the options menu to change to classic controller. Try that

 

[Saiklex]

I edited my post. I had that problem with a game and there was a setting in the options menu to change to classic controller. Try that

Ahah, saw your edit and edited mine. No settings, and as I said in the edit, the prompts should change if the gamepad is indeed recognised as a classic controller, which I thought was what should happen, and they don't

 

[Columbo2811]

Ahah, saw your edit and edited mine. No settings, and as I said in the edit, the prompts should change if the gamepad is indeed recognised as a classic controller, which I thought was what should happen, and they don't

The same happened to me with sega superstars tennis. It says it's classic controller compatible but I wasted time injecting it and it would only see gamepad as wiimote and nunchuck. There's an options menu in the game but no classic controller option. So some games may have this problem. The inputs were off in this game too

 

[cucholix]

Getting a really weird problem now, was testing Fire Emblem and using the Gamepad as a Classic Controller doesn't quite work. It detects it as if it's a wiimote, which means up/down/left/right is mapped instead to left/right/up/down, X and Y are 1 and 2 respectively A and B are A and B, and no other buttons work except + and -. Anyone else getting this issue and know a possible fix? The meta.xml is as it should be,
<drc_use type="unsignedInt" length="4">65537</drc_use>

You can change the controller in the menu IIRC

 

[Saiklex]

You can change the controller in the menu IIRC

The only options I can see is to change the Wiimote from vertical to horizontal. This makes it 'playable' but is far from actual classic controller emulation, the L/R buttons don't work, and a majority of the commands are therefore bound to horrible combinations like "1+2" when it should be simple, intuitive and identical to FE9 if it was to emulate a classic controller.

 

[ShadowOne333]

Those pseudo CCP compatible games sure were like the plague then, very few had native CCP compatibility, instead of request Wiimote first before checking for CCP.

 

[Saiklex]

Those pseudo CCP compatible games sure were like the plague then, very few had native CCP compatibility, instead of request Wiimote first before checking for CCP.

So, does that mean it's not possible to use the gamepad as a CC with this game?

Also, there are values in the meta.xml of "ext_dev_nunchaku" and "ext_dev_classic", could these be relevant? Both were defaulted to 0 from Xenoblade Chronicles base

 

[ShadowOne333]

So, does that mean it's not possible to use the gamepad as a CC with this game?

Also, there are values in the meta.xml of "ext_dev_nunchaku" and "ext_dev_classic", could these be relevant? Both were defaulted to 0 from Xenoblade Chronicles base

Try setting them to 1 and see what it does.
Perhaps that could emulate Wiimote through the Gamepad's inputs.

Though I'm not sure if both "ext_dev_nunchaku" and "ext_dev_classic" are set as "bool" in the code, or if they can have more than two values set to them.

 

[pedro702]

So, does that mean it's not possible to use the gamepad as a CC with this game?

Also, there are values in the meta.xml of "ext_dev_nunchaku" and "ext_dev_classic", could these be relevant? Both were defaulted to 0 from Xenoblade Chronicles base

this is the reason barely anyone patched controlls on wii games with very few exception, wii games were made very wierdly regarding controlls, basicaly most devs just putted a bunch of hacks to detect the controllers and use them and each game is its own controller secction wich makes a general patching quite throublesome, nintendo made one but im guessing it wont be working in all games due to the hackiness that was used on some games.

 

[ploggy]

Well I cant get a "homebrew iso" to work I tried replacing the Main.dol from the NSMBwii iso with the Not64.dol resigned it with Truncha Resigner (made sure the fw.img was patched) but nothing but a black screen when trying to load it?

Has anyone got one to boot?

Feels like we're pretty close though.

 

[cucholix]

The only options I can see is to change the Wiimote from vertical to horizontal. This makes it 'playable' but is far from actual classic controller emulation, the L/R buttons don't work, and a majority of the commands are therefore bound to horrible combinations like "1+2" when it should be simple, intuitive and identical to FE9 if it was to emulate a classic controller.

Are you loading a previous save?

 

[Saiklex]

Are you loading a previous save?

Not sure I understand. I started a new game to test it out, skipped all cutscenes to get to a battle, which is the first time the option menu is available, and found no Classic Controller relevant options. I then resumed this save whenever I wanted to test it again.

 

[cucholix]

Not sure I understand. I started a new game to test it out, skipped all cutscenes to get to a battle, which is the first time the option menu is available, and found no Classic Controller relevant options. I then resumed this save whenever I wanted to test it again.

Oh, I though maybe it checked the configuration from previous save. So games that support Wiimote sideway (no attachment) will take the Wiimote as a CC, and since there's no in game option to change controller we are stuck with Wiimote? IIRC the game hot swapped controllers when it detected an attachment. That also means that maybe Metroid Other M would be "somewhat" playable with gamepad, although it needs the pointer to advance =p

 

[ShadowOne333]

Oh, I though maybe it checked the configuration from previous save. So games that support Wiimote sideway (no attachment) will take the Wiimote as a CC, and since there's no in game option to change controller we are stuck with Wiimote? IIRC the game hot swapped controllers when it detected an attachment. That also means that maybe Metroid Other M would be "somewhat" playable with gamepad, although it needs the pointer to advance =p

That stupid missile mechanic was bollocks.

 

[cucholix]

That stupid missile mechanic was bollocks.

Yeah, would be cool if pointer was mapped to the right stick, and renegerating assigned to a button.

 

[ShadowOne333]

Yeah, would be cool if pointer was mapped to the right stick, and renegerating assigned to a button.

Simple as that, but they had to do some motion gimmicky shit.

 

[Supster131]

Has anyone gotten a Mario Kart Wii patched with wiimmfii to boot up? I've been trying since yesterday, but it stays on a black screen. I assume it's because the wiimmfii patcher scrubs/trims the ISO. So what do?