[PATCH] ARM: boards: Fix beaglebone enviroment

[Sascha Hauer]

On Thu, Sep 03, 2015 at 09:17:29AM +0200, Daniel Schultz wrote:
> This patch adds missing enviroment files to boot from different sources.
> Also adds the handling of default bootsources.
> 
> Signed-off-by: Daniel Schultz <d.schultz at phytec.de>
> ---
>  .../arm/boards/beaglebone/defaultenv-beaglebone/boot/emmc |  6 ++++++
>  arch/arm/boards/beaglebone/defaultenv-beaglebone/boot/mmc |  6 ++++++
>  arch/arm/boards/beaglebone/defaultenv-beaglebone/boot/net | 15 +++++++++++++++
>  .../beaglebone/defaultenv-beaglebone/init/bootsource      | 13 +++++++++++++
>  4 files changed, 40 insertions(+)
>  create mode 100644 arch/arm/boards/beaglebone/defaultenv-beaglebone/boot/emmc
>  create mode 100644 arch/arm/boards/beaglebone/defaultenv-beaglebone/boot/mmc
>  create mode 100644 arch/arm/boards/beaglebone/defaultenv-beaglebone/boot/net
>  create mode 100644 arch/arm/boards/beaglebone/defaultenv-beaglebone/init/bootsource
> 
> diff --git a/arch/arm/boards/beaglebone/defaultenv-beaglebone/boot/emmc b/arch/arm/boards/beaglebone/defaultenv-beaglebone/boot/emmc
> new file mode 100644
> index 0000000..cc2bea2
> --- /dev/null
> +++ b/arch/arm/boards/beaglebone/defaultenv-beaglebone/boot/emmc
> @@ -0,0 +1,6 @@
> +#!/bin/sh
> +
> +mount /dev/mmc1.0 /mnt/
> +global.bootm.image=/mnt/linuximage
> +global.bootm.oftree=/mnt/oftree
> +global.linux.bootargs.dyn.root="root=/dev/mmcblk1p2 rootwait rw"
> diff --git a/arch/arm/boards/beaglebone/defaultenv-beaglebone/boot/mmc b/arch/arm/boards/beaglebone/defaultenv-beaglebone/boot/mmc
> new file mode 100644
> index 0000000..96255d5
> --- /dev/null
> +++ b/arch/arm/boards/beaglebone/defaultenv-beaglebone/boot/mmc
> @@ -0,0 +1,6 @@
> +#!/bin/sh
> +
> +mount /dev/mmc0.0 /mnt/
> +global.bootm.image=/mnt/linuximage
> +global.bootm.oftree=/mnt/oftree
> +global.linux.bootargs.dyn.root="root=/dev/mmcblk0p2 rootwait rw"

This assumes a specific probe order of devices in Linux. What for
example when the external SD card is not plugged in? The eMMC will
become mmcblk0p2 then. Also we assume a very specific layout of the SD
card which is not documented (separate boot partition, root partition
right after that). Could you have a look at bootloader spec which solves
all these problems?

The short version is: Put your rootfs into a partition on the SD card.
In the same filesystem put a file /loader/entries/jessie.conf:

title			Debian Jessy
version			4.2
options			rootwait
linux-appendroot	true
linux			/boot/zImage
devicetree		/boot/am335x-boneblack.dtb

Put the kernel/devicetree to the specified paths in the same filesystem.

In barebox you only have to type 'boot mmc0' or 'boot mmc1' depending
where your rootfs is, or create a nv.boot.default variable containing
the mmc0/1 device.

The appropriate root= option for the kernel will be appended
automatically by barebox when the 'linux-appendroot' option is set to
true in the bootloader spec entry.

> diff --git a/arch/arm/boards/beaglebone/defaultenv-beaglebone/boot/net b/arch/arm/boards/beaglebone/defaultenv-beaglebone/boot/net
> new file mode 100644
> index 0000000..5ca4bad
> --- /dev/null
> +++ b/arch/arm/boards/beaglebone/defaultenv-beaglebone/boot/net
> @@ -0,0 +1,15 @@
> +#!/bin/sh
> +
> +path="/mnt/tftp"
> +
> +global.bootm.image="${path}/${global.user}-linux-${global.hostname}"
> +
> +oftree="${path}/${global.user}-oftree-${global.hostname}"
> +if [ -f "${oftree}" ]; then
> +        global.bootm.oftree="$oftree"
> +fi
> +
> +nfsroot="/nfsroot/${global.hostname}"
> +bootargs-ip
> +/env/config-expansions
> +global.linux.bootargs.dyn.root="root=/dev/nfs nfsroot=$nfsroot,vers=3,udp rw"

except for the /env/config-expansions which does not exist in mainline
this should be the same as in mainline, right?

Sascha

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