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Initial Program Loader, abbreviated as IPL, is a PSP program that runs on boot and loads Kernel. IPL is loaded by [[iplloader]]. IPL can be stored either on the NAND or on a [[Magic Memory Stick]], depending on the iplloader code and if a [[JigKick Battery]] is inserted or not.
Initial Program Loader, abbreviated as IPL, is a PSP program that runs on boot and loads Kernel. IPL is loaded by [[PRE-IPL]]. IPL can be stored either on the NAND or on a [[Magic Memory Stick]], depending on the PRE-IPL code and if a [[JigKick Battery]] is inserted or not.


On DevKits, the file is embedded after the iplloader, named [[Kbooti.bin]].
IPL is divided into chunks of 0x1000 bytes, the size of the buffer used at address 0xBFD00000 where they are decrypted. The IPL blocks are standard KIRK cmd 1 blocks and passed directly to [[KIRK Crypto Engine]] for decryption.


= Tools =
= Tools =
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[https://github.com/mathieulh/Kirk-Bruteforce Kirk-Bruteforce by Team C+D]
[https://github.com/mathieulh/Kirk-Bruteforce Kirk-Bruteforce by Team C+D]


= Location =
= IPL Boot Sequence =
Offset 0x40000 in the NAND (or NAND dump without ECC).
 
= Structure =
 
== Encrypted form ==
 
IPL is divided into chunks of 0x1000 bytes, the size of the buffer used at address 0xBFD00000 where they are decrypted. The IPL blocks are standard KIRK cmd 1 blocks and passed directly to [[KIRK Crypto Engine]] for decryption.
 
== Decrypted form ==


=== Retail ===
The decrypted IPL is composed of 3 parts: Part1 - the 'loader', Part2 - 'main.bin', and Part3 - the 'payload'.


The decrypted IPL is composed of 3 parts: Part1 - the 'loader', Part2 - 'main.bin', and Part3 - the 'payload', aka 'kbooti_for_ipl'.
Part1 is plaintext MIPS code, Part2 is gzip compressed, and Part3 is again encrypted (from 2.60 onwards, parts 2 & 3 are further encrypted again).
 
Part1 is plaintext MIPS code, Part2 is gzip compressed, and Part3 is again encrypted (from 2.60 onwards, parts 2 & 3 are further encrypted again). Part3 is what actually loads the kernel modules from flash and begins the kernel boot process.
 
=== Prototype 0.4.0-0.6.0 (23-07-2004 or older) ===
 
The decrypted IPL only contains the 'payload'
 
= IPL Boot Sequence =


== Part1 IPL (the loader) ==
== Part1 IPL (the loader) ==
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One of the first things Part1 IPL does is reset the main CPU.
One of the first things Part1 IPL does is reset the main CPU.


After reset the iplloader mask ROM device is no longer mapped to memory at all (the 0x1FC00000 address range is then remapped to the 4KB RAM mentioned above to be used for the ME reset vector). This is why the iplloader is no longer accessible once the IPL has booted.
After reset the PRE-IPL mask ROM device is no longer mapped to memory at all (the 0x1FC00000 address range is then remapped to the 4KB RAM mentioned above to be used for the ME reset vector). This is why the PRE-IPL is no longer accessible once the IPL has booted.


Part1 IPL does some very basic hardware inits and decompresses the gzipped Part2 IPL (main.bin) to address 0x04000000 (still in EDRAM).
Part1 IPL does some very basic hardware inits and decompresses the gzipped Part2 IPL (main.bin) to address 0x04000000 (still in EDRAM).
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== Part3 IPL (the payload) ==
== Part3 IPL (the payload) ==


Part 3 is really the IPL equivalent of reboot.bin. Since part2 kindly initialized main DDR memory, part3 is the first to actually run inside DDR. On most modern firmwares this will load to 0x88600000.
TODO
 
After some initial clean up of the co-processsors, this begins by loading /kd/sysmem.prx and /kd/loadcore.prx from flash0. Part3 contains a kernel version of the main prx decrypt routines as well as the keys for decrypting the prx tags for this version of the kernel. This is very similar to what you would find in mesg_led.prx.
 
At the conclusion of the load, part3 sets a series of useful function pointers for loadcore.prx and transfers control to loadcore for the rest of the kernel load process.
 
= Custom IPL =


It is possible to load a custom IPL by either:
= Custom IPL loading =
* exploiting iplloader to run unsigned IPL (never done)
* crafting a fake IPL using bruteforce (since 2007 thanks to [[Prometheus Project]])
* crafting a valid encrypted and signed IPL using recovered keys (since 2018 thanks to PS3 hacks and mathieulh)


See [[iplloader]] and [[Pandora]].
See [[Pandora]].


= See also =
= See also =
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