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commit ce604692dbaf2176939774ddfec0f696fc722553 Author: Adam Feuer <[email protected]> AuthorDate: Fri Sep 4 15:55:09 2020 -0700 deleted section on copying driver code - changed to "use for inspiration only" --- Documentation/guides/drivers.rst | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) diff --git a/Documentation/guides/drivers.rst b/Documentation/guides/drivers.rst index 9d77be8..d458ed8 100644 --- a/Documentation/guides/drivers.rst +++ b/Documentation/guides/drivers.rst @@ -22,17 +22,15 @@ modification. * Note that you'll have to compare the datasheet to the header and code files to see if there are differences; there will usually be some differences between architectures, and they can be significant. -* Find a similar driver in U-Boot source code: +* Find a similar driver in U-Boot, Zephyr or BSD Unix (OpenBSD, FreeBSD, NetBSD) source code: - * Only for inspiration, you can't copy code because of license incompatibility. + * Only for inspiration, you can't copy code because of license incompatibility and Apache Foundation restrictions. + (Apache License 2.0 and BSD code can come in with a software grant agreement from the original authors; this can + sometimes be hard to get. Ask on the mailing list if you're unsure.) * But you can debug to see how the driver works. * `U-Boot <https://www.denx.de/wiki/U-Boot>`_ drivers are often easier to understand than BSD Unix drivers because U-Boot is simpler. -* Find a similar driver in Zephyr or BSD Unix (OpenBSD, FreeBSD, NetBSD): - - * If you find one, you can borrow code directly (Apache 2.0 and BSD licenses are compatible). - * Understanding how the driver works Here are a couple of techniques that helped me.
