On 18/07/18 15:20, Rob Herring wrote:
On Wed, Jul 18, 2018 at 4:50 AM Sebastian Huber
<sebastian.huber@xxxxxxxxxxxxxxxxxx> wrote:
Make the default cells compatible with Linux
(OF_ROOT_NODE_ADDR_CELLS_DEFAULT and OF_ROOT_NODE_SIZE_CELLS_DEFAULT)
which is one cell (except on SPARC, here the default address cells are
two).
The kernel supports a default to avoid breaking old DTs (or perhaps
just OpenFirmware based platforms) which didn't set them. dtc will
throw a warning or error if they are not set. So what platform do we
need to support this on with libfdt?
These two functions had already a default value (2), however, it was
different to the default values chosen by the Linux kernel. This makes
no sense from my point of view since Linux is probably the largest
consumer of device trees.
It is good that the dtc issues warnings and errors in case of malformed
device tree sources. However, the libfdt should be able to deal with all
sorts of already existing device trees. I would like to use these
functions for the real-time operating system RTEMS.
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Sebastian Huber, embedded brains GmbH
Address : Dornierstr. 4, D-82178 Puchheim, Germany
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