I also have a generic USB 3.0 PCIe card, which I put into slot 2. I have a Sonnet Tempo SSD Pro Plus, and I tried to put that in (with an SSD attached) PCI slot 4 with no other drives except the bootable USB thumb drive, and again just a grey screen (holding Option key down).
#MAC PRO EFI FIRMWARE UPDATE 1.5 NOT INSTALLING MAC#
Basically putting in one of my PCIe drive controller cards causes the Mac Pro not to boot. If I pull the PCIe card out, then it boots from Bay2 fine. PCIe: either the SSD or the LSI card (no connected drives) These configurations don't boot either (just giving the grey screen):īay2: the currently working bootable raptor drive plugged in I have removed all PCIe cards except for the 5770 and have tested the PCIe SSD in slots 2, 3 and 4 and it doesn't matter, it still doesn't boot reliably. But if there is no thumb drive and I'm not holding down the Option key, then it fails to boot automatically from the PCIe boot drive (even if there are absolutely no other drives connected to it - internal or external). If I have a bootable USB thumb drive, and I hold down the Option key upon boot, it shows me the PCIe SSD as a boot option, and I can select it and it boots fine. I'll get around to buying a cheap Metal card or somehow try to borrow one later on, if ever. But I don't run macOS on it, and I am not worried about Intel microcode vulnerabilities at the moment, I'm just trying to make it boot. The last macOS that was installed on it was Sierra or perhaps High Sierra.
I don't know which firmware it's running on. I don't have a Metal card (just the 5770 it came with), so I haven't updated to Mojave to update the firmware. I currently have it booting from a 10k raptor in Bay2, but I'd like to be able to boot from a PCIe SSD again. It boots fine from one of the four built-in sata2 bays. I have reset the PRAM and SMC several times. I get a blank grey screen which turns into a flashing grey ? folder. And I've also had an LSI SAS 9207-8i PCIe controller from December 2019, which has been working fine (non-boot).īut recently it just stopped being able to boot from any boot drive plugged into a PCIe slot. I have had it booting from an ssubx 1TB Apple (Samsung) drive pulled from a 2015 Macbook Pro in a cheap PCIe sled since November 2017. I've been running Debian 9 (Proxmox) on my 5,1 for the past couple years and it recently stopped booting from the PCIe drive.