Homebrew ARM9Loader -- Technical Details and Discussion

tvall · Feb 22, 2016

Toiry921 said:
is compiling on Linux still Broken?

nope. works for me

xskibbles said:
So I have my OTP thanks to the easy to follow v2 guide . I wanted to know 2 things. 1) Could someone possibly compile it for me . I'm on OS X so don't really want to mess with it lol.https://mega.nz/#!5w0R3DTZ
2) TO use Rreinand Mod for o3ds what exactly would I have to copy? I want to basically have emunand boot with sysnand boot if a trigger is held etc. Thanks for the help .

mega asks for a decryption key for that link. otherwise i would be uploading a build for ya.
for aureinand, you need the rei-whatever folder renamed to rei in the root of your sd, and the firmware.bin and firmware90.bin in the rei folder. and arm9loaderhax.bin in the root of the sd. plus a few flag files. see the aureinand thread for details i guess

peteruk · Feb 22, 2016

Perhaps this would be the correct place for me to ask, i have heard the term 'arm9 hook' mentioned in a couple of places (Aurora's thread, #cakey)

I tried my friend Google but it was unable to help

Anyone able to explain what it is and what it does ?

Thanks

daxtsu · Feb 22, 2016

peteruk said:
Perhaps this would be the correct place for me to ask, i have heard the term 'arm9 hook' mentioned in a couple of places (Aurora's thread, #cakey)

I tried my friend Google but it was unable to help

Anyone able to explain what it is and what it does ?

Thanks

To put it simply, it would let us ask the ARM9 to do things that we usually wouldn't be allowed to do from userland. In other words, if you had these hooks in place, you could run something like Decrypt9 without having to use 9.x FIRM. That's just one example, though.

Correct me if I'm wrong, @Mrrraou, but that's how I understand it.

dark_samus3 · Feb 22, 2016

peteruk said:
Perhaps this would be the correct place for me to ask, i have heard the term 'arm9 hook' mentioned in a couple of places (Aurora's thread, #cakey)

I tried my friend Google but it was unable to help

Anyone able to explain what it is and what it does ?

Thanks

Basically, it let's you call arm9 stuff from where you want it to be called... basically you could put hooks in arm9 and then you can run arm9 payloads from higher FIRM versions

peteruk · Feb 22, 2016

dark_samus3 said:
Basically, it let's you call arm9 stuff from where you want it to be called... basically you could put hooks in arm9 and then you can run arm9 payloads from higher FIRM versions

So, for example D9 running on 10.5 ?

daxtsu · Feb 22, 2016

peteruk said:
So, for example D9 running on 10.5 ?

Correct.

peteruk · Feb 22, 2016

thanks daxtsu and dark_samus3 for the explanations, 1 more thing learnt today

Urbanshadow · Feb 22, 2016

dark_samus3 said:
Basically, it let's you call arm9 stuff from where you want it to be called... basically you could put hooks in arm9 and then you can run arm9 payloads from higher FIRM versions

It's implementing an arm9 backdoor, in short. Looking cool.

dark_samus3 · Feb 22, 2016

Urbanshadow said:
It's implementing an arm9 backdoor, in short. Looking cool.

the dhs branch of Cakes has had it for awhile apparently

Vappy · Feb 22, 2016

dark_samus3 said:
the dhs branch of Cakes has had it for awhile apparently

dhs would benefit from being updated though, it's not even able to be compiled with newer ctrulibs, and will probably need a bit of work to support the current cakes format to support newer firms. Hopefully now that both cakes devs have arm9loaderhax installed, there'll be a bit of movement with it.

Frelia · Feb 22, 2016

Followed Plailect's OTP guide for N3DS-J, successful downgrade and OTP dump.
Arm9loaderhax took a couple tries but worked after I removed arm9loaderhax.bin, let the 3DS boot and shut off on its own, then reinserted the file.
Booting into 10.5J emu from 9.1J sys smoothly with the advertised 100% bootrate.

One question though: Is 10.5 sys faster than 10.5 emu? Might try that later.

einhuman197 · Feb 22, 2016

I managed to downgrade to 10.3 in emunand and updated again, and now the eshop works ^^! Thanks for the support!

daxtsu · Feb 22, 2016

Frelia said:
One question though: Is 10.5 sys faster than 10.5 emu? Might try that later.

I don't have sysNAND on 10.5 (9.2 sysNAND, 10.5 emuNAND here), but on my particular N3DS, emuNAND is maybe a quarter of a second slower in booting than sysNAND, if that. Roughly 8 seconds for both from power off to home menu visible. Your results may vary if you have a slow SD card though.

Mrrraou · Feb 22, 2016

RednaxelaNnamtra said:
has somebody with a new 3ds tested my bootloader?
On my n3DS it seems to have problems to use files, is there somebody else with this problem?

Yes, I tried it, but it was with the bootloaderloader.

--------------------- MERGED ---------------------------

daxtsu said:
To put it simply, it would let us ask the ARM9 to do things that we usually wouldn't be allowed to do from userland. In other words, if you had these hooks in place, you could run something like Decrypt9 without having to use 9.x FIRM. That's just one example, though.

Correct me if I'm wrong, @Mrrraou, but that's how I understand it.

Yup, you're right.

OctopusRift · Feb 22, 2016

Mrrraou said:
Yes, I tried it, but it was with the bootloaderloader.

--------------------- MERGED ---------------------------

Yup, you're right.

He have arm9 kernel so now we just have to build for it.

Mrrraou · Feb 22, 2016

OctopusRift said:
He have arm9 kernel so now we just have to build for it.

wat

OctopusRift · Feb 22, 2016

Mrrraou said:
wat

memes

Supster131 · Feb 22, 2016

OctopusRift said:
memes

kek9loaderhex

Tjessx · Feb 22, 2016

@RednaxelaNnamtra
I used this build on my O3DS: https://github.com/hartmannaf/arm9loaderhax/tree/bootloader

However, my 3DS directly turns off and i get this error in the log file:

Code:

opened logfile
Checking key
Key checked- selected section:
DEFAULT
Load selected section
ERROR:
Config file %s not found.
shutdown

3xkrazy · Feb 22, 2016

RednaxelaNnamtra said:
has somebody with a new 3ds tested my bootloader?
On my n3DS it seems to have problems to use files, is there somebody else with this problem?

Hi RednaxelaNnamtra,

I'm trying to change the file path for boot_config.ini. I did a search string for it in your code, but found nothing. Bootctr defines it in source/main.c:

For example, I modified this when I used Bootctr:

/source/main.c

Code:

-#define INI_FILE "/boot_config.ini"
+#define INI_FILE "/3ds/boot_config.ini"

Where is the file path for boot_config.ini defined in your fork?

Homebrew ARM9Loader -- Technical Details and Discussion

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