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subsys: settings: nvs: provisioning of settings images #79130

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Closed

subsys: settings: nvs: provisioning of settings images #79130

wants to merge 8 commits into from
+4,437 −217

Commits on Oct 6, 2024

  1. tests: flash_simulator: support non-zero offset 

    The flash simulator tests were still assuming that the base memory
offset of the flash buffer is zero, see #79082.

As we'll introduce non-zero base addresses in the next change of this
change set, we need to fix it now.

Signed-off-by: Florian Grandel <fgrandel@code-for-humans.de>
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    fg-cfh committed Oct 6, 2024
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  2. arch: x86: intel64: add missing dt sections macro 

    The LINKER_DT_SECTIONS macro is being added to the x86/intel64 platform
to support memory attributes.

Signed-off-by: Florian Grandel <fgrandel@code-for-humans.de>
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  3. boards: qemu: x86: rename sim flash node 

    The flash simulator node is renamed for compatibility with other boards.

This is required to access simulated flash under a single name in DTS
(e.g. for samples or tests).

Signed-off-by: Florian Grandel <fgrandel@code-for-humans.de>
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  4. qemu: x86: support memory-mapped flash simulator 

    This change adds a reserved mapped memory region to the QEMU x86 board
and places fixed simulated flash partitions inside that region mapped to
its own linker section in the final ELF file. The section is then added
to the pagetable to support access even if memory protection is active.

The change places the simulated flash at a well-defined memory address
rather than in the common .bss section.

The rationale behind this approach is, that then the contents of the
simulated flash can be pre-provisioned via a separate raw binary or
Intel hex image to qemu (or any other application using simulated flash)
independently from the kernel image.

This will be used in a later PR to exemplify pre-provisioned settings
partitions with the NVS settings backend.

Signed-off-by: Florian Grandel <fgrandel@code-for-humans.de>
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  5. drivers: flash: simulator: simulate pre-provisioned flash 

    Enables the flash simulator to simulate pre-provisioned flash with QEMU
(or any other application using the flash simulator).

Signed-off-by: Florian Grandel <fgrandel@code-for-humans.de>
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  6. samples: settings: make private functions static 

    Makes all private functions static and fixes a minor typo.

Signed-off-by: Florian Grandel <fgrandel@code-for-humans.de>
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  7. samples: settings: mask result values 

    Values may be compressed in the settings storage to reduce memory
footprint. Therefore the read length may be shorter than the target
variable's size. We need to mask the result to zero bits that may remain
from earlier values assigned to the internal variables.

We rename the variable containing the length of data read from "rc" to
"bytes_read" to make this intent clear as we believe that samples should
be as self-documenting as possible.

Signed-off-by: Florian Grandel <fgrandel@code-for-humans.de>
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  8. samples: settings: provisioned flash 

    Adds an overlay, code and documentation to the sample that allows user
to test an independently provisioned settings partition on QEMU.

Also provides instructions how to achieve the same on real devices.

Signed-off-by: Florian Grandel <fgrandel@code-for-humans.de>
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