Support for D-Link DIR-320 A1

Here you have lots of manuals/wiki - lede is just newer openwrt so all should be applicable:
https://wiki.openwrt.org/toh/d-link/dir-320
http://webapp.org.ua/dev/openwrt-chaos-calmer-15-05-on-dlink-dir-320-with-cdma-modem/

http://downloads.lede-project.org/releases/17.01.4/targets/brcm47xx/legacy/

You should also read:
https://lede-project.org/meta/infobox/432_warning

https://lede-project.org/faq/before_installation