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Still waiting for root device -- USBF error; HP Envy 6t

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So I've now tried Lion and ML. ML gives me a USBF error that says the EHCI cannot take control from the BIOS. Then I get the infamous "Still waiting for root device".

My hardware:

HP Envy 6t-1000

Core i5 2467m

HD 3000 + Radeon HD 7670m

6 GB DDR3 1600 (@1333)

2 USB 3.0 + 1 USB 2.0


What I've tried:


cpus=1 (required; kernel panic without)

GraphicsEnabler=no (required; freezes without)


both npci

All PCIRootUID options




Tried a different IOUSBFamily/IOPCIFamily

Tried to unplug and replug the Flash Drive.


Out of ideas... Anyone have an idea?



PS. I have NO changable bios options. I am using the USB 2.0 port.


Edit: Seems that I can use the arch=i386 in the Lion installer to get it to load. So, why am I not loading the USB kext in 64 bit arch?

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Open terminal and type;


cp -pr /Volumes/USBNAME/System/Library/Extensions/*ATA* /Volumes/MLPARTITIONNAME/System/Library/Extensions/.

chown -R root:wheel /Volumes/MLPARTITIONNAME/System/Library/Extensions/*ATA*

chmod -R 755 /Volumes/MLPARTITIONNAME/System/Library/Extensions/*ATA*


Restart with -f

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How can you do that when you can't enter the installation utility? As far as I'm concerned, I couldn't open terminal because the still waiting for root device message appeared before the partitions could be "loaded" and therefore before the installation utility could star.

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