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Tetris -> ULE for initial program, and prebuilt ISO

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CTurt 2020-06-25 17:42:29 +01:00
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@ -6,14 +6,21 @@ For technical details please refer to my [blog post](https://cturt.github.io/fre
## Identify your DVD Player Version
Boot your PlayStation 2 without any disc inserted, and press Triangle.
For initial release only DVD Player version 3.10E is supported (as that's the console I have). Over time I hope other developers from the scene will add support for other DVD Player versions.
For initial release only DVD Player version 3.10E is supported (as that's the console I have). Over time I hope other developers from the scene will add support for additional DVD Player versions.
Pre-built ISO files for supported DVD Players containing just uLaunchELF are provided in this repository for ease of use (which can be used to boot homebrew over USB storage), such as `3.10E.iso`. If you intend to make your own image containing additional homebrew / modified initial loader, please read on.
## Copy your homebrew
The exploit will attempt to boot `VIDEO_TS/VTS_02_0.IFO` as an `ELF`. The default file here is a [Tetris homebrew game by Viktor Gars](https://www.psx-place.com/resources/tetris.431/), but just replace this file with whatever you want.
Once you've identified your console's DVD Player version, copy all of the homebrew you would like to include on the disc into that directory (EG: `3.10E/`).
For the initial release, I didn't reimplement a couple of functions used by the loader, so it requires that the ELF you load doesn't overwrite those functions I use (those are around `0x84000 - 0x85fff` and `0x250000 - 0x29ffff`). I will probably remove this limitation in the future, but all ELFs I could find were fine with it anyway.
## OPTIONAL: Replace the initial program
I've included uLaunchELF recompiled with [DVD support](https://github.com/ps2dev/ps2sdk/pull/130) as the default initial program. It presents a menu which allows you to select any of the homebrew programs you chose to include on the disc (and also allows booting from USB).
You can run `readelf -l` to verify this. For example, the Tetris homebrew just uses `0x00100000 - 0x0017a940`:
Alternatively, if you would rather just boot into a single homebrew application, the initial program the exploit attempts to boot is located at `VIDEO_TS/VTS_02_0.IFO`, replace it with your desired `ELF` file, with the below caveat that compatibility might be lower than if you booted a program through uLaunchELF:
For the initial release, I didn't bother to reimplement a couple of functions used by the loader, so it requires that the ELF you load doesn't overwrite those functions I use (those are around `0x84000 - 0x85fff` and `0x250000 - 0x29ffff`). I will probably remove this limitation in the future, but all ELFs I could find were fine with this limitation.
You can run `readelf -l` to verify your executable satisfies this requirement. For example, this Tetris homebrew just uses `0x00100000 - 0x0017a940`:
$ readelf -l VTS_02_0.IFO
@ -30,14 +37,14 @@ You can run `readelf -l` to verify this. For example, the Tetris homebrew just u
00 .text .ctors .dtors .rodata .data .jcr .sdata .sbss .bss
## Make an image
Once you've placed all the homebrew files you'd like into the directory, generate a UDF image of the directory. The easiest way is probably to install `genisoimage` and run the following (where `exploit.iso` is the output and `3.10E` is the directory containing `VIDEO_TS` and `AUDIO_TS`):
Once you've placed all the homebrew files you'd like into the directory, generate a UDF image of the directory. The easiest way is probably to install `genisoimage` and run the following (where `exploit.iso` is the output and `3.10E` is the directory containing `VIDEO_TS` and any homebrew):
genisoimage -udf -o exploit.iso 3.10E
## Test and burn
I would recommend you test in PCSX2 first, but since [PCSX2 doesn't support loading the DVD Player](https://github.com/PCSX2/pcsx2/issues/1981), you have to decrypt and repack it yourself, which can be a pain.
I would recommend you test in PCSX2 first, but since [PCSX2 doesn't support loading the DVD Player](https://github.com/PCSX2/pcsx2/issues/1981), you have to decrypt and repack it yourself, which is beyond the scope of this README. With that said, if you aren't touching anything in `VIDEO_TS`, there shouldn't really be any reason for the exploit to fail.
## Replacing loader payload
If you wish to work on the loader payload, see run `build.sh` inside `PAYLOAD` directory, and copy the output `fullpayload.bin` to `VIDEO_TS/VIDEO_TS.IFO` at offset `0x2bb4`.
## DEVELOPMENT: Replacing the loader payload
The default payload will boot `VIDEO_TS/VTS_02_0.IFO` as an ELF file, but tweaks might be desired to improve compatibility, or maybe changing the behaviour to boot `BOOT.ELF` instead for instance.
The default loader will boot `VIDEO_TS/VTS_02_0.IFO` as an ELF file, but tweaks might be desired to improve compatibility.
If you wish to update the loader payload, run `build.sh` inside `PAYLOAD` directory, and copy the output `fullpayload.bin` to `VIDEO_TS/VIDEO_TS.IFO` at offset `0x2bb4` (for 3.10E).