Drop isofs module requirement for getting SYSTEM.CNF from ISO images

[pcm720]

This PR introduces EE-side code for retrieving SYSTEM.CNF contents from ISO files instead of using isofs.irx module.
This reduces the number of load environment dependencies and enables third-party launchers to use quick boot flag without non-PS2SDK modules, shortening overall load times

This leaves only one outstanding issue preventing quick boot from working: fileXioInit() needs to be called by Neutrino even when qb flag is set, otherwise lseek64 calls fail. Not sure how to correctly implement this since qb can be set without fileXio being loaded.

[israpps]

Not sure how to correctly implement this since qb can be set without fileXio being loaded.

I made a PR that fixes the issue if RPC binding hanging eternally, but it never was approved nor merged

That would avoid freezing if you unit FILEXIO while it's not there

[rickgaiser]

This leaves only one outstanding issue preventing quick boot from working: fileXioInit() needs to be called by Neutrino even when qb flag is set, otherwise lseek64 calls fail. Not sure how to correctly implement this since qb can be set without fileXio being loaded.

With the -qb flag neutrino requires certain modules to be present. It's perfectly fine for neutrino to fail if -qb is set, but iomanX or fileXio are not loaded. The requirements will have to be documented in the readme (or a wiki page that I intend to add to github in the future).

Can you add the fileXioInit(); in the apropriate place? I think this will be at:

neutrino/ee/loader/src/main.c

Line 1263 in 2b0cf08

if (sys.bQuickBoot == false) {

Followed by something like:

} else {
  // Quickboot requires certain IOP modules to be loaded before starting neutrino
  // Initialize EE side connection to them
  fileXioInit(); // TODO: exit on error
}

[pcm720]

Done

[rickgaiser]

Thanks! Merging.