readme: add basic README.md

frank-w · Oct 28, 2023 · efda6a1 · efda6a1
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+# Buildroot Initrd for BananaPi R2/R64/R2Pro/R3/R4
+
+## Requirements
+
+## Usage
+
+if you want to build for R64/R2Pro/R3/R4, change "board" in build.conf first
+
+```sh
+  ./build.sh importconfig
+  ./build.sh config #To configure manually with menuconfig
+  ./build.sh
+```
+
+### using the initrd
+
+from my uboot:
+
+```sh
+BPI-R3> run useusb #optional if files are on usb-drive
+BPI-R3> setenv initrd rootfs_bpi-r3.cpio.zst
+BPI-R3> setenv fit bpi-r3-6.1.itb
+BPI-R3> run newboot
+```