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Francesco Perin

Boot stuck at USBMSC Identifier (non unique)

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Hi, I've tried to install Yosemite. It installs, it starts up and i can get the Desktop but if i try to restart, i can't boot anymore. If i boot in -v, i can see only USBMSC Identifier (non unique).... Can somebody help me? I'm posting a screenshot of the problem

 

Thank you

 

1415640274__img_0013.jpg

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BOOT: USBBusFix=Yes

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Already tried. Doesn't work.

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I have same problem.  :(

post-61495-0-41993800-1415652659_thumb.j

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I don't know if this is a real solution, but it works fine if I boot with the -f flag. Also added in the org.chameleon.Boot.plist in 

<key>Kernel Flags</key> 
<string>npci=0x2000 dart=0 -f</string>

and it boots fine. 
If there's a better way to make it work, please, let me know.

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I would like to point out that if you remove all the "IOUSB*" kexts from /System/Library/Extensions you can successfully boot, but you won't have USB support. I have the same problem, and I haven't found a viable solution yet.

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If there's a better way to make it work, please, let me know.

 

I solved this by downgrading to Niresh's Mavericks. the USB kexts from Yosemite are incompatible with a LOT of legacy hardware.

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