CUBOX snapshots working?

[Brett Glass]

While waiting for the new SolidRun board I just ordered to come in, 
I decided to tinker with one of their older products: a CUBOX 
I2U-300-D. I downloaded the latest CUBOX snapshot (12.0 r323729), 
burned it onto an SD card, dropped the card into the box, plugged 
in an HDMI monitor, and watched the onboard serial port as I 
applied power. This is what I saw (on the serial port; the monitor 
stayed blank):

U-Boot SPL 2017.07 (Sep 19 2017 - 23:14:46)
Trying to boot from MMC1


U-Boot 2017.07 (Sep 19 2017 - 23:14:46 +0000)

CPU:   Freescale i.MX6D rev1.2 996 MHz (running at 792 MHz)
CPU:   Extended Commercial temperature grade (-20C to 105C) at 14C
Reset cause: POR
Board: MX6 Cubox-i
DRAM:  1 GiB
MMC:   FSL_SDHC: 0
*** Warning - bad CRC, using default environment

No panel detected: default to HDMI
Display: HDMI (1024x768)
In:    serial
Out:   serial
Err:   serial
Net:   FEC
Hit any key to stop autoboot:  0
## Error: "boot¦md_mmc0" not defined
## Error: "boot¦md_usb0" not defined
## Error: "boot¦md_pxe" not defined
## Error: "boot¦md_dhcp" not defined

...and of course it didn't boot. Without the HDMI monitor plugged 
in, it failed with different errors, but still did not boot.

What's the last good snapshot?

--Brett Glass