[2/2] configs: add RaspberryPi defconfig

This is a default configuration for the RaspberryPi, tested and functionnal.

The kernel used is the one developped by the RaspberryPi foundation as it's not
fully supported currently in mainline kernel.
The configuration used for the kernel is the default bcmrpi.

For more info, please find board/raspberrypi/README.txt

Signed-off-by: Maxime Hadjinlian <maxime.hadjinlian@gmail.com>
---
 board/raspberrypi/README.txt |  127 ++++++++++++++++++++++++++++++++++++++++++
 configs/rpi_defconfig        |   19 +++++++
 2 files changed, 146 insertions(+)
 create mode 100644 board/raspberrypi/README.txt
 create mode 100644 configs/rpi_defconfig

Hi maxime, all,

2013/1/13 Maxime Hadjinlian <maxime.hadjinlian@gmail.com>:
> This is a default configuration for the RaspberryPi, tested and functionnal.
>
> The kernel used is the one developped by the RaspberryPi foundation as it's not
> fully supported currently in mainline kernel.
> The configuration used for the kernel is the default bcmrpi.
>
> For more info, please find board/raspberrypi/README.txt
>
> Signed-off-by: Maxime Hadjinlian <maxime.hadjinlian@gmail.com>
Acked-by: Samuel Martin <s.martin49@gmail.com>

Regards,

ping ?

On Sun, Jan 13, 2013 at 5:17 PM, Samuel Martin <s.martin49@gmail.com> wrote:
> Hi maxime, all,
>
> 2013/1/13 Maxime Hadjinlian <maxime.hadjinlian@gmail.com>:
>> This is a default configuration for the RaspberryPi, tested and functionnal.
>>
>> The kernel used is the one developped by the RaspberryPi foundation as it's not
>> fully supported currently in mainline kernel.
>> The configuration used for the kernel is the default bcmrpi.
>>
>> For more info, please find board/raspberrypi/README.txt
>>
>> Signed-off-by: Maxime Hadjinlian <maxime.hadjinlian@gmail.com>
> Acked-by: Samuel Martin <s.martin49@gmail.com>
>
> Regards,
>
> --
> Samuel

Dear Maxime Hadjinlian,

On Sun, 13 Jan 2013 15:23:54 +0100, Maxime Hadjinlian wrote:
> diff --git a/configs/rpi_defconfig b/configs/rpi_defconfig
> new file mode 100644
> index 0000000..8c73d0e
> --- /dev/null
> +++ b/configs/rpi_defconfig
> @@ -0,0 +1,19 @@
> +BR2_arm=y
> +BR2_arm1176jzf_s=y
> +
> +BR2_TOOLCHAIN_BUILDROOT_LARGEFILE=y
> +BR2_TOOLCHAIN_BUILDROOT_CXX=y

Please add:

# Lock to 3.8 headers to avoid breaking with newer kernels
BR2_KERNEL_HEADERS_3_8=y

Thanks,

Thomas

Hi,

Minor comments below.

> For more info, please find board/raspberrypi/README.txt

If the defconfig filename is rpi_defconfig, shouldn't the board
directory be called board/rpi for consistency?


> +++ b/board/raspberrypi/README.txt

The patchs adds a whitespace error:

Applying: configs: add RaspberryPi defconfig
/home/vivien/projects/buildroot/.git/rebase-apply/patch:140: new blank line at EOF.
+
warning: 1 line adds whitespace errors


> +What is generated
> +-----------------
> +
> +After building, you should obtain this tree:
> +
> +    output/images/
> +    +-- rootfs.tar
> +    +-- rpi-firmware
> +    |   +-- bootcode.bin
> +    |   +-- config.txt
> +    |   +-- fixup_cd.dat
> +    |   +-- fixup.dat
> +    |   +-- start_cd.elf
> +    |   `-- start.elf
> +    `-- zImage
> +
> +Note : rootfs.tar will only be there if you kept "tar the root
> filesystem"
> +option selected in "Filesystem images".
> +
> +Where should the binaries be copied on the SDCard
> +-------------------------------------------------
> +
> +Your SDCard must have its first partition using fat32 and with
> bootable flags.
> +
> +At the root of the partition, the RaspberryPi must find the
> following files:
> +
> + * bootcode.bin
> + * config.txt
> + * fixup_cd.dat
> + * fixup.dat
> + * start_cd.elf
> + * start.elf
> + * zImage
> +
> +So you should, copy the entire content of output/images/rpi-firmware
> along with
> +zImage.
> +
> +Note : You can create any number of partitions you desire, the only
> requirement
> +is that the first partition must be using fat32.
> +
> +Persistent rootfs
> +==================
> +
> +How to build it
> +---------------
> +
> +You only need to use the rpi_defconfig, to do so:
> + * make rpi_defconfig
> +
> +What is generated
> +-----------------
> +
> +After building, you should obtain this tree:
> +
> +    output/images/
> +    +-- rootfs.tar
> +    +-- rpi-firmware
> +    |   +-- bootcode.bin
> +    |   +-- config.txt
> +    |   +-- fixup_cd.dat
> +    |   +-- fixup.dat
> +    |   +-- start_cd.elf
> +    |   `-- start.elf
> +    `-- zImage
> +
> +Where should the binaries be copied on the SDCard
> +-------------------------------------------------
> +
> +Your SDCard must have its first partition using fat32 and with
> bootable flags.
> +It should also have another partition which will contain your
> rootfs, it should
> +be partitioned as ext4.

I don't think ext4 is a requirement here, ext2 also works well.

> +
> +Boot partition
> +~~~~~~~~~~~~
> +
> +The first partition will contain everything used to boot the
> RaspberryPi.
> +You must copy theses files at the root of partition:
> +
> + * bootcode.bin
> + * config.txt
> + * fixup_cd.dat
> + * fixup.dat
> + * start_cd.elf
> + * start.elf
> + * zImage

The information in the README file is a bit redundant (especially
commands, output/images and 3rd party files listings). It could be
more concise, with just a note at the end for the non-persistent
config (with initramfs).


It may also be nice to have a simple script to create the sdcard
in the board directory, such as the one provided by OpenELEC:

https://github.com/OpenELEC/OpenELEC.tv/blob/master/packages/tools/bcm2835-bootloader/files/create_sdcard

What do you think?

Cheers,
Vivien