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x99-a/usb 3.1 Yosemite 10.10.5 now works ONLY from usb, not from internal sata


iNic
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I installed 10.10.5 using clover 3330 for postinstall on my new asus x99-a/usb-3.1 build.

Install usb created using my El Cap Retina MBP 15. The installation is on 850 evo sata ssd.

For a couple of days, everything worked and I was able to boot from the clover bootloader.

Clover picked iMac14,2 smbios def, which seemed to work.

Then all of a sudden Yosemite refuses to boot from the internal sata port.

Surprisingly, I found out that booting the same ssd from an external usb 3 to sata 3 adapter works!

(Yosemite works ok as long as I add dev-kept-mode=1 to the boot-args)

 

What am I missing?

Thanks!

 

x99-a/usb-3.1 i7-5820k

gtx 970 ftw

32gb ddr4-3200

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