Although I've succeeded getting LEDE running on a D-Link DIR-600 with no LuCI, when I add LuCI in Buildroot, the flash images are no longer generated. I presume this means insufficient space, especially since when I tried to install LuCI from opkg it failed explicitly with "not enough space on device".
I then did a make defconfig to get what I assumed was a "fail safe" set of packages for the DIR-600, and was happy to see that LuCI was selected. But make failed to generated images even from the default config for that device.
I'm not sure what to do next. Do I conclude that LEDE with LuCI has just grown too big for this device (with 8MB Flash), and that I should file a bug or pull request in the default config for the device? Or might I be doing something else wrong?