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

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

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Commits on Sep 27, 2024

  1. drivers: flash: simulator: fix address resolution 

    The flash simulator assumes that flash is being addressed with absolute
addresses by clients. But this is not the case. Given addresses are
relative to the flash base address.

The existing code only worked because the base address was always zero.
Testing with non-zero base addresses caused a mem fault/page fault.

(Reproducible e.g. when using the NVS settings subsystem on QEMU x86
with a non-zero base address in the soc-nv-flash node.)

Fixes zephyrproject-rtos#79082

Signed-off-by: Florian Grandel <fgrandel@code-for-humans.de>
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    fgrandel committed Sep 27, 2024
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  2. arch: x86: ia32: linker.ld: add missing DT sections macro 

    Generating sections via DT memory attributes did not work for the
platform as only the memory region was created so far.

Signed-off-by: Florian Grandel <fgrandel@code-for-humans.de>
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    fgrandel committed Sep 27, 2024
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  3. 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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  4. 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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    fgrandel committed Sep 27, 2024
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  5. 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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    fgrandel committed Sep 27, 2024
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