HDL_Patch by Zer0-X

**nigecube** · 08-16-2005,07:45 AM

Originally Posted by tot31

So if I want to set it as UDMA0, I just change offset 0x91124 to 00? The original value for this offset is 04.

Yep! I've just tried it and as if by magic, Fatal Frame II now works perfectly.

So far....

**tot31** · 08-16-2005,08:03 AM

Originally Posted by nigecube

Yep! I've just tried it and as if by magic, Fatal Frame II now works perfectly.

So far....

That is a good news. I'll try back at home.

**OEP** · 08-16-2005,08:14 AM

Think this would have any impact on HSG Fore?

**crazyc** · 08-16-2005,08:53 AM

Originally Posted by Zer0-X

Without having any closer look yet... The mode is set in the GUI part but not separately in the core itself?

The mode is set when the drive is fiirst initialized, the core doesn't reset the drive, so those settings are kept.

I'm not sure what's diffirenent of UDMA and MDMA?

If you don't know, don't worry about it and don't try it.

I think setting 0x91108 to 0x20 was just to enable MDMA (multiword DMA) while 0x91124 to 0xY is DMA mode Y

For MDMA 0x91124 has to be set to 0, 1 or 2.
0 = 4.2 MB/s
1 = 13.3 MB/s
2 = 16.6 MB/s

Would it be possible to alter Slow HDD acess (Mode 1) to incorperate this somehow? (If it isn't how it's done already)

Would require changes to ps2atad.irx because the function that sets this is not exported and it cannot be changed in the core.

**Ryoandr** · 08-16-2005,01:32 PM

Crazyc, could you please tell us the location of the UDMA mode offset on 48bit patched hdloader?

**gusano1** · 08-16-2005,01:36 PM

if patch with option /L (patch 0.7c)
where this located?

**crazyc** · 08-16-2005,02:12 PM

Originally Posted by Ryoandr

Crazyc, could you please tell us the location of the UDMA mode offset on 48bit patched hdloader?

It seems to be at 0x2842e8.

Edit: I have an hdloader binary with that offset, I don't know where it came from. Anyway the correct offset for 48 bit lba patched hdloader is 0x91214.

**Ryoandr** · 08-16-2005,02:56 PM

Originally Posted by crazyc

It seems to be at 0x2842e8.

hmm, value at that offset is 10

**gusano1** · 08-16-2005,03:06 PM

the value in this offset (0x2842e8) is 10

**dlanor** · 08-16-2005,03:15 PM

I believe we should drop MDMA from the discussion for safety reasons (no error correction), but seriously consider the different UDMA speeds for addition to the next version of hdlpatch as 3 new mode bits. Not only is this a nice way to make HDAdvance 3.0 outdated

, but on the more serious side, I think it could have serious impact on some games.

One of the most common problems in the past has been various forms of freezing that could often be cured by the slowdown of Mode 1, but we also know several games that freeze in similar ways where Mode 1 doesn't help at all. Having access to another method for causing similar slowdown might help some of those games to work, especially as we can fine-tune the speed with this method to achieve optimum performance, and even combine this method with Mode 1 for really troublesome games.

Already one game has been reported as fixed by the UDMA patching and I'm sure others will follow, but simple patching is really too primitive to test this well, as we need to use different ELFs for each combination of UDMA speeds and other mode flags. We need it integrated with the GUI, and that means a new hdlpatch version.

Of course, that choice is entirely up to Zero-X. The above is just my opinion and advice on the subject.

Best regards: dlanor

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