need the Marvell drivers for those BUT I have not tried  using the ports ( on my list for this weekend)
 
can you still see the boot disk in the boot over ride in the BIOS save and exit menu ?
 
I was using enable and disable setting to try to dual boot - almost worked but windows-10 would throw a fit and had to repair.
 
Disable the M.2 items if you are not using them - they disable some SATA ports when in use.
AND don't bounce back and forth between raid and non-raid in the BIOS setting switches.
--------
I am NOT a Win-10 person and forgot to read the fine print about using the NEW crabby lake CPU chips as Windows 10 only.

do you have a drive connected to the marvel ports?

1. have  you installed the just released BIOS update 1.02  ?
I was having problems with BIOS 1.01 not seeing some  items -- 
IF not sounds like you will need to do that Via the USB flash stick path.
 
2. Which CPU chip ?
 
SATA slots going down for memory slots
top -- under
----------
(-)-----(-) The small socket
----------
 
----------
(7)----(6)   Marvell SATA3 6G
-----------
(5)----(4)
-----------
 
------------
(0)----(2)   SATA 3
(1)----(3) 
(-)----(-) The small socket
-------------
 
 
 
 
 

I just tried a Sata SSD in marvell sata slot 5
This is just a data disk used and formatted on another system
 
rebooted into BIOS and don't really see it there under SATA list
 
BUT it does show up as a disk in Windows 10
and you can see :
check you device manager and
under storage controllers
 see if Marvell 92xx SATA 6G controller is there.
 
I also see it under DISK Drives in device manager
and it shows up under portable device as it still has on the hot swap flag set.
 
Make sure  under BIOS ADVANCED  : onboard device configuration
you see Marvell SATA controller
it is right under USB 3.1 controller and USB 3.0 controller on my bios
 
If you see all that for a non-bootable disk in a Marvell slot than I guess next step 
is using the bottom part ofthe BIOS  BOOT tab slide down to the bottom
and check out that area. This seems to let you select more boot options than the few in the above area.
(UEFI hard Disk Drive BBS Priorities)
 
I am at the end of what I have tried doing with this new MB
I have avoided Marvell for years (but wanted to also try it again)
 
 
 
 

I finally got it to work.  In the BIOS setup, I had to use LEGACY instead of UEFI for the boot setup (the option above the Boot Order option"
 
Once I did that, I could select the SSD in port 0 of Intel SSD.  And when it boots, I see the Marvell connected SATA devices during the boot up sequence. 
 
Thanks all for everyone's help!
 
Hansang