Hello Joel,
Am 17.05.21 um 14:04 schrieb Joel Sherrill:
On Mon, May 17, 2021, 2:35 AM Christian Mauderer
<christian.maude...@embedded-brains.de
<mailto:christian.maude...@embedded-brains.de>> wrote:
The -@ option adds symbols that are used when applying an overlay. RTEMS
doesn't support overlays or re-parsing of device trees. So the symbols
only increase the size of the binary.
The same is true for the padding. It would be useful if the device tree
is changed during run time which is not supported in RTEMS.
Update #4180
---
user/bsps/arm/imxrt.rst | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/user/bsps/arm/imxrt.rst b/user/bsps/arm/imxrt.rst
index 1bce6d7..c60b51d 100644
--- a/user/bsps/arm/imxrt.rst
+++ b/user/bsps/arm/imxrt.rst
@@ -118,7 +118,7 @@ with your FDT source names)::
sh> arm-rtems6-cpp -P -x assembler-with-cpp \
-I ${PREFIX}/arm-rtems6/imxrt1052/lib/include \
-include "YOUR.dts" /dev/null | \
- dtc -@ -O dtb -o "YOUR.dtb" -b 0 -p 1024
+ dtc -O dtb -o "YOUR.dtb" -b 0 -p 64
sh> rtems-bin2c -C -N imxrt_dtb "YOUR.dtb" "YOUR.c"
Make sure that your new c file is compiled and linked into the
application.
C should be capitalized.
I'll create an extra commit for that because it's an unrelated change.
Do you think the command should be explained in the docs like you did in
the comment?
From my point of view that is not necessary. I don't see a use case of
the -@ or a bigger padding in the near or even not so near future.
Therefore I don't think it's useful to describe options that are _not_
used for this BSP.
I start to think that we sooner or later will have to add some general
device-tree information to our manual. But I'm not sure yet what and
where. Basically stuff like:
- What is a device tree. What are the file endings dts and dtb.
- What is a good source for a device tree (most of the time FreeBSD in
our case).
- How to handle it with U-Boot.
- How to apply overlays with U-Boot.
- How to replace it with a device tree that is compiled into the
application and why it will infect the code with GPL in most cases.
I think we already start to duplicate some of that stuff in the BSP
documentation. Do you have a suggestion where we could put such a chapter?
Best regards
Christian
--
2.26.2
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