diff --git a/README.md b/README.md
index 9cd717a..7a09bda 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,17 @@
 WIP stuff to get started on the pinebook pro.
+
+## `u-boot`
+
+Assuming `/dev/mmcblk0` is an SD card.
+
+```
+$ nix-build -A u-boot
+$ lsblk /dev/mmcblk0 && sudo dd if=result/idbloader.img of=/dev/mmcblk0 bs=512 seek=64 oflag=direct,sync && sudo dd if=result/u-boot.itb of=/dev/mmcblk0 bs=512 seek=16384 oflag=direct,sync
+```
+
+The eMMC has to be zeroed (in the relevant sectors) or else the RK3399 will use
+the eMMC as a boot device first.
+
+Alternatively, this u-boot can be installed to the eMMC.
+
+Installing to SPI has yet to be investigated.