Hacking Question How boot launchers bypass fusee checks?

[Qubarf]

I was just wondering how boot launchers such as hekate and sx os bypass fusee checks?

 

[Adran_Marit]

I was just wondering how boot launchers such as hekate and sx os bypass fusee checks?

I assume they all use a similar method... this section of code is from the reinx bootloader.c source file

void bootloader() {

mbist_workaround();

clock_enable_se();

// This makes fuse registers visible
clock_enable_fuse(0x01);
check_sku();

// Check configuration fuses
check_config_fuses();

// Disables fuse programming until next reboot
FUSE(FUSE_PRIVATEKEYDISABLE) = 0x10;

// Setup memory controllers
mc_enable();

// Pre-Firmware setup
setup();
}

Beyond that I have no clue XD

 

[M7L7NK7]

magic

 

[Qubarf]

I assume they all use a similar method... this section of code is from the reinx bootloader.c source file

void bootloader() {

mbist_workaround();

clock_enable_se();

// This makes fuse registers visible
clock_enable_fuse(0x01);
check_sku();

// Check configuration fuses
check_config_fuses();

// Disables fuse programming until next reboot
FUSE(FUSE_PRIVATEKEYDISABLE) = 0x10;

// Setup memory controllers
mc_enable();

// Pre-Firmware setup
setup();
}

Beyond that I have no clue XD

K, thx

 

[Masamune3210]

I'm pretty sure Big N's bootloader is the thing that checks the fuse count and panics if the count isn't correct, as it's also the thing that will burn fuses if the count is too low.

 

[Adran_Marit]

I'm pretty sure Big N's bootloader is the thing that checks the fuse count and panics if the count isn't correct, as it's also the thing that will burn fuses if the count is too low.

You are, but when using a modded console the CFW bypasses nintendos bootloader

 

[Qubarf]

Just as a fact, the switch bootloader isn't stored in NAND right?

 

[Masamune3210]

No, you are thinking about the bootrom, which does some minimal hardware init then starts the bootloader which is stored in one of the firmware partitions

 

[Qubarf]

Ah, ok. Thank you!