Update README.md

README.md

@@ -38,37 +38,15 @@ rustup component add rust-src llvm-tools-preview clippy rustfmt
 cargo install cargo-xbuild cargo-binutils
 ```
 
-Additionally, a Micro SD card with [firmware
-files](https://github.com/raspberrypi/firmware/tree/master/boot) on a FAT
-filesystem is needed.
-
-I recommend to get a [Micro SD card USB
-adapter](http://media.kingston.com/images/products/prodReader-FCR-MRG2-img.jpg)
-(many manufacturers ship SD cards with such an adapter), so that you can connect
-the card to any desktop computer just like an USB stick, no special card reader
-interface required (although many laptops have those these days).
-
-You can create an MBR partitioning scheme on the SD card with an LBA FAT32 (type
-0x0C) partition, format it and copy `bootcode.bin`, `start.elf` and `fixup.dat`
-onto it. **Delete all other files or booting might not work**. Alternatively,
-you can download a raspbian image, `dd` it to the SD card, mount it and delete
-the unnecessary .img files. Whichever you prefer. What's important, you'll
-create `kernel8.img` with these tutorials which must be copied to the root
-directory on the SD card, and no other `.img` files should exists there.
+## USB Serial
 
 I'd also recommend to get an [USB serial debug
 cable](https://www.adafruit.com/product/954). You connect it to the GPIO pins
 14/15.
 
-![UART wiring diagram](doc/wiring.png)
-
-Then, run `screen` on your desktop computer like
-
-```bash
-sudo screen /dev/ttyUSB0 115200
-```
+[Tutorial 6](06_drivers_gpio_uart) is the first where you can use it. Earlier tutorials will work solely with `QEMU`.
 
-Exit screen again by pressing <kbd>ctrl-a</kbd> <kbd>ctrl-d</kbd>
+![UART wiring diagram](doc/wiring.png)
 
 ## License