AsRock J3455M won't boot from RAID card

[malloc_error]

I've just received an AsRock J3455M motherboard, swapped the existing board in my system, connected everything, powered on and started Windows install. Seemed to be going fine - the mirror on the Syba SI-PEX40057 (Marvell 88SE9230) was detected ok.

After the initial reboot, and removing install USB, I just end up in UEFI everytime, and it seems that there's no way to boot to the PCI-e card. Nothing shows up in boot options.

Am I missing some kind of legacy boot setting?

Thanks!

 

[malloc_error]

aaaaand after spending yesterday evening making no progress, as soon as I post a question here, I figure out the solution...

Under Boot, very bottom of the list: CSM(Compatibility Support Module). After enabling this and saving, I can boot from the PCI-e card.