Thanks for the help, but I am still having issues.
After figuring out that I needed to also download the kernel, and put it into boot, I managed to get things together, and all the files are where they should be, but now when I try to boot, I get:
run bootmmc
switch to partitions #0, OK
mmc0 is current device
** File not found var/Image **
** File not found var/armada-3720-community.dtb **
Bad Linux ARM64 Image magic!
And then when running ext4ls, I get
Marvell>> ext4ls mmc 0:1
<DIR> 4096 .
<DIR> 4096 ..
<DIR> 16384 lost+found
<DIR> 0 media
<DIR> 4096 bin
<DIR> 4096 proc
<DIR> 0 tmp
<DIR> 36 dev
<DIR> 4096 sys
<DIR> 0 lib
<DIR> 4096 var
<DIR> 663 root
<DIR> 653 etc
<DIR> 0 boot
<DIR> 0 usr
<DIR> 4096 mnt
<DIR> 4096 srv
<DIR> 4096 run
<DIR> 4096 opt
<DIR> 4096 sbin
<DIR> 4096 home
Which does not match the guide, because the numbers are different…
And running this…;
ext4ls mmc 0:1 boot
Returns nothing, as though it was empty.
I know there are files in there though, browsing to that directory on my desktop finds the files… I am very confused.