forked from raspberrypi/linux
-
Notifications
You must be signed in to change notification settings - Fork 24
Device Tree on ARCH_BCM2708
notro edited this page Jul 21, 2014
·
3 revisions
This page details the work getting Device Tree support on ARCH_BCM2708 (used in the official RPi kernel).
The work is done in parallel with the Upstreaming (ARCH_BCM2835) effort.
Moving to ARCH_BCM2835 can take some time, so this aims at giving Device Tree support sooner.
Basic Device Tree support is added.
Devices that can be added: platform_device
These drivers are needed to give full Device Tree support for the end user
| ARCH_BCM2708 | ARCH_BCM2835 | Status |
|---|---|---|
| bcm2708_gpio | pinctrl-bcm2835 | pinctrl-bcm2708 is added |
| spi-bcm2708 | spi-bcm2835 | Work in progress |
| i2c-bcm2708 | i2c-bcm2835 | Work in progress |
| ARCH_BCM2708 | ARCH_BCM2835 | Status |
|---|---|---|
| bcm2708_wdog | bcm2835_wdt | |
| bcm2708-rng | bcm2835-rng | |
| bcm2708-i2s | bcm2835-i2s |
How to build: http://elinux.org/RPi_Kernel_Compilation
Enable Device Tree
ARCH=arm make bcmrpi_defconfig
ARCH=arm make menuconfig
# System Type ---> Broadcom BCM2708 Implementations ---> [*] BCM2708 Device Tree support
The quick way including debug option
ARCH=arm make bcmrpi_defconfig
scripts/config --enable BCM2708_DT
# Device Tree contents in /proc/device-tree/
scripts/config --enable PROC_DEVICETREE
yes "" | ARCH=arm make oldconfig
Add to /boot/config.txt
device_tree=bcm2708-rpi-b.dtb
device_tree_address=0x100
kernel_address=0x8000
disable_commandline_tags=2