Enable basic device tree support on 11.05 supported boards
Improve SoC coverage of Device Tree
NO SESSION REQUIRED
Blueprint information
- Status:
- Complete
- Approver:
- Paul McKenney
- Priority:
- Essential
- Drafter:
- Paul McKenney
- Direction:
- Needs approval
- Assignee:
- Grant Likely
- Definition:
- Approved
- Series goal:
- None
- Implementation:
-
Implemented
- Milestone target:
- None
- Started by
- Mounir Bsaibes
- Completed by
- Mounir Bsaibes
Whiteboard
Specification shared with https:/
For the 11.05 release, all of the kernel working group hwpacks will have device tree support enabled in U-Boot and the kernel, and passing a device tree instead of ATAGs will be supported. To compete this work, the following tasks need to be completed for each of the hwpacks:
1) Enable CONFIG_OF_LIBFDT and CONFIG_
u-boot tree.
2) Enable CONFIG_OF and CONFIG_
3) Add something like the following to the *existing* machine
definition. For initial basic support, you don't need to create a
separate <soc>-dt.c board support file yet.
+static const char *omap4_
+ "ti,omap4-panda",
+ NULL
+};
+
MACHINE_
[...]
+ .dt_compat = omap4_panda_
MACHINE_END
The string in the match table should be in the form "<vendor>
4) Add a template .dts file for the board in
arch/arm/
/dts-v1/;
/include/ "skeleton.dtsi"
/ {
model = "TI Panda Board";
compatible = "ti,omap4-panda";
memory {
reg = <0x80000000 0x08000000>;
};
};
You can see other examples in the arch/arm/boot/dts directory.
5) test it :-)
6) send patches to me for inclusion in the Linaro U-Boot and Kernel
trees. I'll collect them to start and ask John and Nicolas to pull
them into their trees when they're ready.
7) Update the image tools to copy .dtb files onto the boot media and to pass the device tree to the kernel at boot time.
Enable and test basic DT on u8500 has a blueprint to handle separately.
Work Items
Work items:
[r64343] Enable and test basid DT on efikamx: DONE
[glikely] Enable and test basic DT on igep: DONE
[r64343] Enable and test basic DT on imx51: DONE
[r64343] Enable and test basic DT on imx53: DONE
[tixy] Enable and test basic DT on omap3 and omap3-x11-base: DONE
[doanac] Enable and test basic DT on overo: DONE
[glikely] Enable and test basic DT on panda: DONE
[thomas-ab] Enable and test basic DT on s5pv310: DONE
Enable and test basic DT on vexpress: DONE
[shawnguo] Update kernel packaging to include .dtb files: DONE
Dependency tree
* Blueprints in grey have been implemented.
