On 02.05.24 09:18, Pere Garcia wrote:
Hi Jon,
SystemReady IR owner here at ATG. May I ask, what would be the purpose
of DTB provided by the OS? The primary function (not only one) of DTB
from a SystemReady perspective is for the Platform (fw) advertise to the
OS what's in there, there are other secondary functions and some
vendors use DTB to store FW-only information or proprietary data
structures that do not break the interoperability to OSes.
Is such OS DTB containing platform information, or is this DTB
containing data useful for the OS or meaningful to be originated from
the OS ? can you please elaborate a bit?
Thanks in advance,
Pere
Device-trees are a mixture of hardware description and operating
instructions for the kernel (e.g. baudrate of the UART, driver or host
operating mode of a USB port).
Device-tree overlays may be needed for optional hardware (e.g. Raspberry
hats).
Linux device-trees evolve over time. Full board support cannot be
expected with an outdated device-tree provided by firmware. Furthermore
both backward and forward incompatibilities occur from time to time.
Using the device-tree matching the booted kernel typically provides the
best user experience.
Best regards
Heinrich
_______________________________________________
boot-architecture mailing list -- boot-architecture@lists.linaro.org
To unsubscribe send an email to boot-architecture-le...@lists.linaro.org
