[yocto] [meta-raspberrypi][PATCH v2 0/1] Support for .dtbo files for dtb overlays, required by firmware after 2016/04/12

[Herve Jourdain]

Hi,

Sorry, it seems there has been some mismatch in my test setup...
So while .dtbo are required for 4.4.9+, there NOT to be used for 4.1.21 it
seems...
I will therefore send soon a v3 patchset, that will work fine for 4.4
(what's laid out here is needed for 4.4) without breaking overlay support
for 4.1.

Best regards,

Hervé

-----Original Message-----
From: Herve Jourdain [mailto:herve.jourdain at neuf.fr] 
Sent: samedi 14 mai 2016 12:16
To: yocto at yoctoproject.org
Cc: Herve Jourdain <herve.jourdain at neuf.fr>
Subject: [yocto][meta-raspberrypi][PATCH v2 0/1] Support for .dtbo files for
dtb overlays, required by firmware after 2016/04/12

Please disregard v1, there was 1 patch missing for 4.4 kernel...

The firmware after 2016/04/12 () seems to have altered the behavior of
device tree loading on RaspberryPi: for overlays, it loads only .dtbo files,
not .dtb anymore.
Also, it does not check for -overlay extension, so the name of the overlay
that is placed in the "overlays" directory must be <overlay_name>.dtbo,
instead of <overlay_name>-overlay.dtb.

This patch tries to address this issue for 4.4 and 4.1 kernels.
It must be used in conjunction with another patch to
meta/recipes-kernel/linux-dtb.inc, which will allow the processing of .dtbo
files, instead of only .dtb.

.dtb are still used, but only for the "real" device trees (not the
overlays).

This is in line with the behavior of kernels 4.4.6+

Herve Jourdain (1):
  Support for .dtbo files for dtb overlays, required by firmware after
    2016/04/12

 classes/linux-raspberrypi-base.bbclass             |  4 +--
 classes/sdcard_image-rpi.bbclass                   |  6 ++--
 conf/machine/include/rpi-base.inc                  | 30 +++++++++----------
 .../0002-fix-dtbo-rules.patch                      | 35
++++++++++++++++++++++
 .../0001-fix-dtbo-rules.patch                      | 13 ++++++++
 recipes-kernel/linux/linux-raspberrypi_4.1.bb      |  1 +
 recipes-kernel/linux/linux-raspberrypi_4.4.bb      |  1 +
 7 files changed, 70 insertions(+), 20 deletions(-)  create mode 100644
recipes-kernel/linux/linux-raspberrypi-4.1/0002-fix-dtbo-rules.patch
 create mode 100644
recipes-kernel/linux/linux-raspberrypi-4.4/0001-fix-dtbo-rules.patch

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