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Xilinx User Community Forums :
Embedded Solutions :
Embedded Linux :
Using Xilinx Open Source Linux with EDK 11.1, device trees
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Using Xilinx Open Source Linux with EDK 11.1, device trees
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linnj
Expert Contributor
Posts: 354
Registered: 09-10-2008
Message 1 of 1
Viewed 1,258 times
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There are new core versions in EDK 11.1 and a new device tree generator is needed to deal with them. The drivers in the kernel have versions in them to say what h/w they are compatible with. We changed the device tree generator so that it would deal with some backward compatibility so we don't have to change the drivers every time there's new h/w. Since some drivers are in the mainline kernel changing them often is not a quick and painless task. Thanks, John git.xilinx.com Git - device-tree.git/commit
device-tree: Enhancement: "compatible = " is now a list
To avoid having to update the linux kernel every time a Xilinx core changes
it's version string, with this change, the generator now generates
"compatible=" lines with:
1) the core's actual version
2) the oldest core version that is software compatible with the core's
actual version.
Example:
compatible = "xlnx,xps-intc-2.00.a", "xlnx,xps-intc-1.00.a";
There are a few rules that go with this:
1) The oldest core version listed must be a version that is already supported
by the linux kernel, or this change doesn't help.
2) The versions are considered compatible if the driver/kernel code made for
the older version will work with the core's actual version. What this means
is that the newer core might have additional features, but the core must
be operable by the driver/kernel using only the older feature set.
This feature is implemented by using a static table in the tcl script. At this
time there does not seem to be a good method for determining this using
automation.
Signed-off-by: John Bonesio
<john.bonesio@xilinx.com>
John Linn
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04-10-2009 03:13 PM
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