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boards/raspberrypi: update instructions

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Now that we have a sanitised set of defconfig files, and we no longer
support non-DT setups, update and simplify the board readme file.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Floris Bos <bos@je-eigen-domein.nl>
Cc: Pascal de Bruijn <pmjdebruijn@pcode.nl>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This commit is contained in:
Yann E. MORIN 2015-06-30 00:07:46 +02:00 committed by Thomas Petazzoni
parent 76b00bde62
commit 6f999784b8
1 changed files with 22 additions and 26 deletions
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48
board/raspberrypi/readme.txt
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@ -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:
For models A, B, A+ or B+:
$ make raspberrypi_defconfig
Alternatively, if you want to test support for the Device Tree:
$ make raspberrypi_dt_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
$ cp output/images/rpi-firmware/* /mnt/mountpointboot
$ cp output/images/*.dtb /mnt/mountpointboot
If your kernel does *not* have support for the Device Tree, then install
it with:
$ cp output/images/zImage /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