I have a Mac Pro 4,1 upgraded to a 5,1 with MacOS installed on an SSD and Windows 10 installed via a hacked Boot Camp on a separate HDD.
I'm running a GTX680 GPU which is Mac OS flashed to allow the display of the Mac boot screen over HDMI, but as I run a displayport connection, this is not that convenient when I want to switch from one OS to another.
I can use the Boot Camp option under both MacOS and Windows to choose by boot drive, but the Mac will always boot to Windows unless I switch to an HDMI connection and use the alt-key on reboot to choose my startup drive.
The SSD with MacOS on it is connected to the second optical drive SATA connection; the Windows drive is in the first drive bay.
Any idea why choosing the boot drive via Boot Camp is not working?