From 09082b24a525539d6c4689738ebf42ef460bf2de Mon Sep 17 00:00:00 2001
From: Sebastien Bourdeauducq <sb@m-labs.hk>
Date: Wed, 5 Jan 2022 08:04:25 +0800
Subject: [PATCH] README: update build instructions

---
 README.md | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/README.md b/README.md
index 3efcb27..55f65b2 100644
--- a/README.md
+++ b/README.md
@@ -10,21 +10,19 @@
 
 See the `mcu` folder of the [nix-scripts repository](https://git.m-labs.hk/M-Labs/nix-scripts).
 
-### Debian-based systems (tested on Ubuntu 19.10)
+### Development environment
 
-- install git, clone this repository
-- install [rustup](https://rustup.rs/)
+Clone this repository and [nix-scripts](https://git.m-labs.hk/M-Labs/nix-scripts).
 
 ```shell
-rustup toolchain install nightly
-rustup update
-rustup target add thumbv7em-none-eabihf --toolchain nightly
-rustup default nightly
+nix-shell -I nix-scripts=[path to nix-scripts checkout]
 cargo build --release
 ```
 
 The resulting ELF file will be located under `target/thumbv7em-none-eabihf/release/thermostat`
 
+Alternatively, you can install the Rust toolchain without Nix using rustup; see the channel manifest file in nix-scripts (`channel-rust-nightly.toml`) to determine which Rust version to use.
+
 ## Debugging
 
 Connect SWDIO/SWCLK/RST/GND to a programmer such as ST-Link v2.1. Run OpenOCD: