readme: initial commit

Signed-off-by: Ozan Durgut <[email protected]>

Author: ozan956

readme.md

@@ -0,0 +1,26 @@
+# ADI br2-external
+
+This [br2-external](https://buildroot.org/downloads/manual/manual.html#outside-br-custom)
+contains Buildroot configuration specific to ADI that can not be mainlined.
+Generic support for ADI evaluation boards is implemented in the [ADI Buildroot
+tree](github.com/analogdevicesinc/buildroot).
+
+```
+git clone --recurse-submodules https://github.com/analogdevicesinc/br2-external.git
+cd br2-external/buildroot
+make BR2_EXTERNAL="${PWD}/.." adi_sc598_ezkit_defconfig
+support/kconfig/merge_config.sh .config \
+    ../configs/buildroot.fragment \
+    ../configs/debug.fragment
+```
+
+Then following the board specific instructions in `buildroot/board/adi/`.
+
+## ADI configuration
+
+- `configs/buildroot.fragment`
+    - Configure Buildroot to speed up builds
+- `configs/debug.fragment`
+    - Enable debugging in U-Boot and the kernel
+    - Build the kernel image with an embedded root filesystem to reduce
+      complexity around writing and mounting a root filesystem from storage