I have an ADB A4100N and wanted to put openwrt on it, so i opened it and checked the SPI ROM (Spansion 64 Mbit) and RAM (Winbond 256 Mbit DDR2) and broadcom 6328 as the SoC.
Since it had the same spec as the supported ADB A4001N, i flashed OpenWRT the corresponding 19.7 image.
The flashing was successful, ethernet was working, but led were not mapped correctly and wlan totally missing, so i checked b43 logs, it said it was unsupported chip (it was a 4313).
So i've built a custom image of openwrt 19.7 with the correct driver and the correct led mappings.
Is creating the dts and adding the device in the bcm63xx.mk enought to make it work?
19.07 is very old and has been eol and unsupported for almost half a decade. It has accumulated many serious security vulnerabilities and is not safe to use. Instead of wasting time with that old device, you should be instead looking for more modern hardware that can run a currently supported version of OpenWrt.
Sorry, I only have the hardware that i have, anyway i did manage to port the device to 19.07, i realize this is not very useful, but it was for me, as i gained some experience on the porting, led mappings, dts making and so on. I wasn't able to make the bcm4313 work, but i undestand that is not fully supported and that this device is not worth enough to spend more time on it.
Now i have a pair of D Link DSL 3580L, i understand that i can port this device to openwrt 25 using (target bmips 6362)?