Move all to deprecated folder.

deprecated/firmware/buildroot/board/raspberrypi/readme.txt

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+Raspberry Pi
+
+Intro
+=====
+
+These instructions apply to all models of the Raspberry Pi:
+  - the original models A and B,
+  - the "enhanced" models A+ and B+,
+  - the model B2 (aka Raspberry Pi 2).
+
+How to build it
+===============
+
+Configure Buildroot
+-------------------
+
+There are two RaspberryPi defconfig files in Buildroot, one for each
+major variant, which you should base your work on:
+
+For models A, B, A+ or B+:
+
+  $ make raspberrypi_defconfig
+
+And for model 2 B:
+
+  $ make raspberrypi2_defconfig
+
+Build the rootfs
+----------------
+
+Note: you will need to have access to the network, since Buildroot will
+download the packages' sources.
+
+You may now build your rootfs with:
+
+  $ make
+
+(This may take a while, consider getting yourself a coffee ;-) )
+
+Result of the build
+-------------------
+
+After building, you should obtain this tree:
+
+    output/images/
+    +-- bcm2708-rpi-b.dtb           [1]
+    +-- bcm2708-rpi-b-plus.dtb      [1]
+    +-- bcm2709-rpi-2-b.dtb         [1]
+    +-- boot.vfat
+    +-- kernel-marked/zImage        [2]
+    +-- rootfs.ext4
+    +-- rpi-firmware/
+    |   +-- bootcode.bin
+    |   +-- cmdline.txt
+    |   +-- config.txt
+    |   +-- fixup.dat
+    |   `-- start.elf
+    +-- sdcard.img
+    `-- zImage
+
+[1] Not all of them will be present, depending on the RaspberryPi
+    model you are using.
+
+[2] This is the mkknlimg DT-marked kernel.
+
+How to write the SD card
+========================
+
+Once the build process is finished you will have an image called "sdcard.img"
+in the output/images/ directory.
+
+Copy the bootable "sdcard.img" onto an SD card with "dd":
+
+  $ sudo dd if=output/images/sdcard.img of=/dev/sdX
+
+Insert the SDcard into your Raspberry Pi, and power it up. Your new system
+should come up now.