MP5,1 won't boot back to Mojave after BootCamp win10

[axrst]

If this has discussed before pardon me, but a search did not gave me something relative (or my English are not so well).

OK, I have a MacPro 5,1 with a Saffire Pulse RX580 and Mojave. Recently I updated the boot ROM version to 141.0.0.0.0 but the problem is still there:

If I choose to boot from the windows drive, I cannot return to Mojave any more with the normal way (right click to the boot camp icon in the Windows tray and selecting the boot to MacOS...). I have to do a nVRAM clean (option+p+r at boot time) to return back to MacOS. The other way works fine. After choosing the win drive from System Preferences the Mac boots on Windows10.

My card is windows BIOS and of course I cannot see what happens in the boot time. After some time after the try to boot to macOS, the Mac boots again in windows. If I clear the NVRAM, then I can boot to macOS.

My disks:
- Mojave in Fusion Drive (custom made) with the 1st HDD 1TB and a SSD 250MB in the lower tray.
- Windows 10 in SSD 500GB in tray2
- 2 other not bootable drives in the other trays (3 and 4).
All disks are SATA2 connected (I'm planing a NVMe upgrade in the next days)

So, is there any idea on what may the problem is? Also is there a way to flash the RX580 with custom Mac efi to have boot screens?

Thanks!

 

[bookemdano]

Did you see this post: https://forums.macrumors.com/thread...ut-a-boot-screen.2114788/page-9#post-26689280 ?

You need to install the iMac Pro version of the Windows Boot Camp Control Panel in order to successfully set an APFS macOS volume (which all Mojave installs are) as the boot drive. h9826790's tutorial instructs you how to do that via Brigadier.

If you have already done that then I wonder if it has something to do with your homebrew fusion drive setup. That's the first thing I would suspect anyway, since it deviates from a stock configuration.

Edit: Also, no way to get boot screens on the RX 580 or 560. We are all in the same boat.

 

[axrst]

Thanks for your answer.

I'll try that thing with iMac pro boot camp panel.

I also suspected the fusion drive since its a logical drive and not a physical one, but it works perfect since 2013 and "survived" from quite OS's installations/upgrades.

 

[tsialex]

Thanks for your answer.

I'll try that thing with iMac pro boot camp panel.

I also suspected the fusion drive since its a logical drive and not a physical one, but it works perfect since 2013 and "survived" from quite OS's installations/upgrades.

Mojave Fusion drive is different from previous versions. You should backup your data and re-do the Fusion drive, but before check if your SSD is still healthy - the way Fusion drives work make some SSD cells work very hard and fail a lot earlier that a normal SSD usage. Use DriveDX to do check if you have any problems.

 

[axrst]

I think that I'll wait a couple of weeks to install the new NVMe I'm waiting for, so I can see what happens. Then I can safe re-build the fusion without losing any time away of MacOS.

 

[tsialex]

I think that I'll wait a couple of weeks to install the new NVMe I'm waiting for, so I can see what happens. Then I can safe re-build the fusion without losing any time away of MacOS.

Check your SSD with DriveDX anyway. All non-SLC SSDs that I used to make Fusion Drives are slowly dying.

Keep your backups current.

 

[axrst]

Yes I will.

I allready checked my iMac's (mid2010) fusion in the office with DriveDX. This is also from 2013 and although SSD is OK, the HDD has some bad sectors, so I'll have to replace it with a new SSD. No need to make a new fusion anymore with the current SSD prices.

As, for backup, I always use time machine to have a recent backup of my Macs.