I ended up using one of these: https://www.amazon.com/Regulator-DROK-Converter-Step-Down-Transformer/dp/B0758ZTS61?ref_=ast_sto_dp&th=1&psc=1 I did mount it to a small heat sink to allow it to provide enough current.

I got an AW9523 hooked up and it seems to be working, but I was wondring which kernel module you are using? I was looking through your patch file and I can't seem to find a mention of and AW9523 specific module. Ultimaltely I am trying to see if I can hook some extra LEDs into the kernel LED subsystem to allow things like HDD activity to flash them.

If I were to hook up just an AW9523 to the FFC connector, would I need additional kernel patches to talk to those led's or is the current patchset already enough? I am thinking about designing a small board to connet to the Interceptor that would give NAS applications the option of adding blinkenlights to the front.

Actually, that is not what happens on my board. If I have entries for both mmcblik0p3 and sda1, then choosing mmcblk0p3 will mount mmcblk0p3 as the rootfs.

Ok, I think I managed to fix things. I tried to re-install with "Create boot/recovery partitions on eMMC?" "Yes", but that just ended up giving me choices for mmcblk0p3 (default) and sda1. I ended up formatting both the old sda1 and mmcblk0p3 file systems and installing to sda1 from the recovery boot screen.

I don't remember seeing that prompt, but I might have missed it. Is there and easy way to uninstall the original eMMC install and start over? At this point, I am just getting started so having to do a fresh install is not much of an issue.

Actually, it was the other way around. I installed to EMMC first since I did not have a SSD attached yet. After that, I used the install option from the boot menu to install to SDA1

It can sort of work, if you use the 5V and Ground pins on the 9 J1 (the 9 pin USB Header) I just put one on since it seems I was getting some thermal issues during testing. The blue PWM pin is not used, but the fan is pretty much silent even at full speed. I am getting some 12V fans to replace the one on the heatsink, but I figured that part is good enough to start testing. Hope this helps.

I have two copies of your OS on the CM4. One is on the EMMC and one is on sda1. I now get two entries in the boot menu, one to boot from mmcblk1 (default) and one to boot from sda1. If I use the default, my rootfs is still mounted on mmcblk1. I would like the CM4 to boot up to use sda1 on root by default.