Hacking HW_AHBPROT modification steps or guide?

Maxternal · Feb 5, 2013

The nice thing about just patching the IOS is that you can use the code it already has to access the hardware. Having the PPC talk to it directly means having to write drivers from scratch.

harder, but doable.

Ray Lewis · Feb 5, 2013

Maxternal said:
The nice thing about just patching the IOS is that you can use the code it already has to access the hardware. Having the PPC talk to it directly means having to write drivers from scratch.

harder, but doable.

Interesting. Mega had it sound like it did not need patches/drivers. Unless I misunderstood his post. Or he did not go inti driver detail.

Maxternal · Feb 5, 2013

Ray Lewis said:
Interesting. Mega had it sound like it did not need patches/drivers. Unless I misunderstood his post. Or he did not go inti driver detail.

For a lot of things a driver is just a couple lines of code. For other's it's huge and complicated. Basically by "driver" I just mean you would have to tell the program how to interact with that part of the hardware instead if just asking the IOS to do it for you.

SifJar · Feb 5, 2013

I'm going to make a wild assumption here: Presumably IOS will have already mounted /dev/flash. This would mean all the PPC code would have to do is actually read it, which unless I'm mistaken shouldn't require much code.

Full disclaimer: I don't know if this is the case. Nor do I know how you would read it from PPC. But it seems logical to me.

Ray Lewis · Feb 6, 2013

Thanks for explaining that. Lots of info flowing, including Marcan's twitter;-)

davebaol · Feb 9, 2013

Maxternal said:
The nice thing about just patching the IOS is that you can use the code it already has to access the hardware. Having the PPC talk to it directly means having to write drivers from scratch.

harder, but doable.

Ok I've just looked into IOS code and they completely removed /dev/flash device from any recent ios.
So the approach proposed by megazig is definitely the clean way to proceed.
With AHB rights PPC can write to the NAND hw registers which are documented here: http://wiibrew.org/wiki/Hardware/NAND_Interface
Also nand.c from mini - see http://gitweb.bootmii.org/?p=mini.git;a=summary - is a good starting point. it's basically a reverse engineered /dev/flash.
Porting that code to PPC should be easy enough, I guess.
Anyways I'm not really interested in, so I won't do it.
I wanted to share though.

damysteryman · Feb 9, 2013

Thanks a heap for looking into this davebaol

davebaol · Feb 9, 2013

You're welcome.
I do it for fun

officialjunk · Feb 9, 2013

Thanks for everyone's insights. When I have some time I'll make an attempt. Of course I get slammed at work the moment I began to be interested in this

JoostinOnline · Feb 9, 2013

officialjunk said:
Of course I get slammed at work the moment I began to be interested in this

That's exactly why I quit working on [insert something complicated that I don't understand].

Hacking HW_AHBPROT modification steps or guide?

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