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RFC: memory regions from devicetree & explicit code locations #33656

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RFC: memory regions from devicetree & explicit code locations #33656

wants to merge 6 commits into from

Commits on Apr 1, 2021

  1. cmake: boilerplate: add BOARD_LAYOUT parsing 

    Add a second modifier to the board string that allows for specifying a
code layout. Both board revision and board layout can be specified
independently, or together. If specified together, the layout must
follow the revision.

A board indicates that it supports multiple code layouts by the presence
of the `layouts` folder in the board folder. If this folder exists and
no layout is specified, the `default` layout is selected. The selected
layout must exactly match an overlay file in that folder.

An optional Kconfig configuration file may also exist.

For example, for a layout of `mcuboot` on board `test`:
```
test
 - layouts
   - default.overlay
   - mcuboot.overlay
   - mcuboot.conf
  -test.dts
  -...
```

The valid board specifiers are now:
`board`
`board@revision`
`board%layout`
`board@revision%layout`

Signed-off-by: Jordan Yates <jordan.yates@data61.csiro.au>
    Jordan Yates committed Apr 1, 2021
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  2. cmake: apply layout overlays and configuration 

    Apply board dts overlays and kconfig configurations when `BOARD_LAYOUT`
is specified.

Fixes #31487.

Signed-off-by: Jordan Yates <jordan.yates@data61.csiro.au>
    Jordan Yates committed Apr 1, 2021
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  3. boards: nrf52840dk_nrf52840: convert to layouts 

    Convert the nrf52840dk_nrf52840 board to use the new board layouts as
a demonstration of the changes required.

Signed-off-by: Jordan Yates <jordan.yates@data61.csiro.au>
    Jordan Yates committed Apr 1, 2021
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  4. linker: macros for memory regions from devicetree 

    Adds a public macro for creating memory regions from devicetree
partitions. All partitions under `chosen/zephyr,flash` result in an
output region.

`DT_PARTITION_REGIONS` declares the memory regions for consumption by
ld. While macro limitations mean that region names are quoted and there
are no seperators between regions, ld appears to handle this fine.

Signed-off-by: Jordan Yates <jordan.yates@data61.csiro.au>
    Jordan Yates committed Apr 1, 2021
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  5. linker: arm: generate memory regions from dt 

    Generate linker memory regions from flash partitions that exist under
the chosen node `zephyr,flash`. This makes the linker aware of the
various flash memory regions. If code overflows from one region to
another, the linker will complain. This additionally enables variables
to be placed at absolute memory addresses by placing sections inside
the generated memory regions.

Fixes #31073, #27471.

Signed-off-by: Jordan Yates <jordan.yates@data61.csiro.au>
    Jordan Yates committed Apr 1, 2021
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  6. linker: arm: simplify region definitions 

    Simplify bespoke memory region definitions by declaring the regions
directly from devicetree nodes.

Signed-off-by: Jordan Yates <jordan.yates@data61.csiro.au>
    Jordan Yates committed Apr 1, 2021
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