Hello,
I tried to get further acquainted with the new build system and how the spec
files work.
Following a previous discussion
(https://lists.rtems.org/pipermail/users/2020-November/067971.html) I thought
adding support for the 4 kB MMU pages to the xilinx_zynq_* BSPs might be a
small task to check things out.
Unfortunately, I still ran in some problems.
What I essentially have to do is:
1. Add the option ARM_MMU_USE_SMALL_PAGES to the xilinx_zynq BSPs.
2. Update the linker script to reserve enough space for the small table
descriptors.
1.) was pretty straight forward. I just added the a link to optmmusmallpages to
the xilinx-zynq/grp.yml of the BSP family.
For 2.) I essentially only have to update the ARM_MMU_TRANSLATION_TABLE_SIZE to
the right value.
The default value of 16kiB is set in arm/optmmusz.yml. For option
ARM_MMU_USE_SMALL_PAGES enabled this would need to be 4MiB+16kiB.
How would I achieve to set the MMU table size dependent on the
ARM_MMU_USE_SMALL_PAGES option?
Would it be somewhere in xilinx-zynq/grp.yml?
Or in the arm/optmmusz.yml somehow with the "default-by-variant" mechanism.
Or would I create an new xilinx-zynq/optmmusz.yml and define it there?
Or something else?
Best regards,
Jan
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
German Aerospace Center
Institute for Software Technology | Software for Space Systems and Interactive
Visualization | Lilienthalplatz 7 | 38108 Braunschweig | Germany
Jan Sommer
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