[U-Boot] Unable to saveenv to MMC

[Robin Polak]

Hello.

  I'm having trouble persisting my environment variables to the SD Card
onto which I have FAT formatted and then written U-Boot to using the
following command:

sudo dd if=u-boot-sunxi-with-spl.bin of=/dev/disk2 bs=1024 seek=8

I get the following error when booting a Linksprite_pcDuino3_Nano with the
SD Card I've built:

U-Boot SPL 2018.11 (Dec 06 2018 - 17:57:48 +0000)
DRAM: 1024 MiB
CPU: 912000000Hz, AXI/AHB/APB: 3/2/2
Trying to boot from MMC1


U-Boot 2018.11 (Dec 06 2018 - 17:57:48 +0000) Allwinner Technology

CPU:   Allwinner A20 (SUN7I)
Model: LinkSprite pcDuino3 Nano
I2C:   ready
DRAM:  1 GiB
MMC:   SUNXI SD/MMC: 0
Loading Environment from FAT... Unable to use mmc 0:0... In:    serial
Out:   serial
Err:   serial
SCSI:  SATA link 0 timeout.
AHCI 0001.0100 32 slots 1 ports 3 Gbps 0x1 impl SATA mode
flags: ncq stag pm led clo only pmp pio slum part ccc apst

Net:   eth0: ethernet at 1c50000
starting USB...
USB0:   USB EHCI 1.00
USB1:   USB OHCI 1.0
USB2:   USB EHCI 1.00
USB3:   USB OHCI 1.0
scanning bus 0 for devices... 1 USB Device(s) found
scanning bus 2 for devices... 1 USB Device(s) found
       scanning usb for storage devices... 0 Storage Device(s) found
Hit any key to stop autoboot:  0
=> saveenv
Saving Environment to FAT... Unable to use mmc 0:0... Failed (1)

Thank you for any light that may be shed upon this error.

-- 
--
Robin Polak
robin at robinpolak.com
917-494-2080