I have Rock Pi 4 B+ and Penta SATA Hat. I completed the setup of Armbian, OMV, the software of the hat on eMMC.
There is a problem that after connecting Penta SATA Hat to the M2 port on Pi 4B+, the system won’t boot to eMMC. If disconnect the M2 cable but still connect GPIO 40 pins, Pi 4B+ boot the system normally on both eMMC and MicroSD card.
I read several threads but my mind is not clear yet. All help is sincerely appreciated. Thank you.
Update: I installed Armbian on an HDD and plug it into the SATA slot of the hat. The blue LED of the hat turns on with no flashing, seems like the Hat does recognize the existence of the HDD. The blue LED of the Pi 4 is off, with no flashing. No signal of booting from either HDD or eMMC or MicroSD card. Seems like the Penta hat somehow prevents booting the system.
Update 2: Debian does work !!! I use the same power source but I boot from Debian instead of Armbian and the system does boot up with M2 cable + 40 pins of hat connected to Pi 4B+. Seems like Penta Sata hat does not support Armbian and my power source works fine.
Update 3: Armbian 20.05.3 Buster tty1 does work. My opinion was wrong, Penta Sata hat does work with Armbian but somehow the newest version - Armbian Buster xfce mainline based kernel 5.10.y - does not work.