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-rw-r--r--board/raspberrypi/readme.txt48
1 files changed, 22 insertions, 26 deletions
diff --git a/board/raspberrypi/readme.txt b/board/raspberrypi/readme.txt
index 4ead046ffc..cf9587997f 100644
--- a/board/raspberrypi/readme.txt
+++ b/board/raspberrypi/readme.txt
@@ -22,17 +22,14 @@ How to build it
Configure Buildroot
-------------------
-The raspberrypi_defconfig configuration is a minimal configuration with
-all that is required to bring the Raspberry Pi up. You should base your
-work on this defconfig:
+There are two RaspberryPi defconfig files in Buildroot, one for each
+major variant, which you should base your work on:
- $ make raspberrypi_defconfig
-
-Alternatively, if you want to test support for the Device Tree:
+For models A, B, A+ or B+:
- $ make raspberrypi_dt_defconfig
+ $ make raspberrypi_defconfig
-For Raspberry Pi 2 use a different defconfig:
+And for model 2 B:
$ make raspberrypi2_defconfig
@@ -64,20 +61,23 @@ Result of the build
After building, you should obtain this tree:
output/images/
- +-- rootfs.tar [0]
+ +-- rootfs.tar [0]
+-- rpi-firmware/
- | +-- bcm2708-rpi-b.dtb
- | +-- bcm2708-rpi-b-plus.dtb
- | +-- bcm2709-rpi-2-b.dtb
| +-- bootcode.bin
| +-- config.txt
| +-- fixup.dat
| `-- start.elf
+ +-- bcm2708-rpi-b.dtb [1]
+ +-- bcm2708-rpi-b-plus.dtb [1]
+ +-- bcm2709-rpi-2-b.dtb [1]
`-- zImage
[0] Note for Volatile: rootfs.tar will only be there if you kept
"tar the root filesystem" option selected in "Filesystem images".
+[1] Not all of them will be present, depending on the RaspberryPi
+ model you are using.
+
Prepare you SDCard
==================
@@ -105,30 +105,26 @@ Install the binaries to the SDCard
At the root of the boot partition, the Raspberry Pi must find the following
files:
- * bcm2708-rpi-b.dtb [1]
- * bcm2708-rpi-b-plus.dtb [2]
- * bcm2709-rpi-2-b.dtb [3]
+ * bcm2708-rpi-b.dtb [2]
+ * bcm2708-rpi-b-plus.dtb [3]
+ * bcm2709-rpi-2-b.dtb [4]
* bootcode.bin
* config.txt
* fixup.dat
* start.elf
* zImage
-[1] For models A and B
-[2] For models A+ and B+
-[3] For model 2
+[2] For models A and B
+[3] For models A+ and B+
+[4] For model 2
For example:
- $ cp output/images/rpi-firmware/* /mnt/mountpointboot
-
-If your kernel does *not* have support for the Device Tree, then install
-it with:
-
- $ cp output/images/zImage /mnt/mountpointboot
+ $ cp output/images/rpi-firmware/* /mnt/mountpointboot
+ $ cp output/images/*.dtb /mnt/mountpointboot
-If your kernel *does* have support for the Device Tree, then install it
-with:
+The kernel image must be marked with a special header so that the
+bootloader of the RaspberryPi knows it supports Device Tree:
$ ./output/host/usr/bin/mkknlimg output/images/zImage /mnt/mountpointboot/zImage