[PATCH v2 2/2] schemas: Add a schema for binman
Alper Nebi Yasak
alpernebiyasak at gmail.com
Thu Aug 3 22:29:38 CEST 2023
On 2023-07-20 22:56 +03:00, Simon Glass wrote:
> With this version I have done with a generic name, in this case 'data',
> as suggested by Alper Nebi Yasak. This may be controversial, but we may
> as well have the dicussion now. I assume that there are no other
> ongoing attempts to define the layout of firmware in devicetree.
>
> Signed-off-by: Simon Glass <sjg at chromium.org>
> ---
>
> Changes in v2:
> - Reworked significantly based on Alper's comments
>
> dtschema/schemas/firmware/binman/entry.yaml | 80 +++++++++++++++++++++
> dtschema/schemas/firmware/image.yaml | 77 ++++++++++++++++++++
> 2 files changed, 157 insertions(+)
> create mode 100644 dtschema/schemas/firmware/binman/entry.yaml
> create mode 100644 dtschema/schemas/firmware/image.yaml
>
> diff --git a/dtschema/schemas/firmware/binman/entry.yaml b/dtschema/schemas/firmware/binman/entry.yaml
> new file mode 100644
> index 0000000..d50f96d
> --- /dev/null
> +++ b/dtschema/schemas/firmware/binman/entry.yaml
> @@ -0,0 +1,80 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright 2023 Google LLC
> +
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/firmware/image/entry.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Image entry
> +
> +maintainers:
> + - Simon Glass <sjg at chromium.org>
> +
> +description: |
> + The entry node specifies a single entry in the firmware image.
> +
> + Entries have a specific type, such as "u-boot" or "atf-bl31". This is provided
> + using compatible = "data,<type>".
> +
> + Note: This definition is intended to be hierarchical, so that entries can
> + appear in other entries. Schema for that is TBD.
> +
> +properties:
> + $nodename:
> + pattern: "^[-a-z]+(-[0-9]+)?$"
> +
> + compatible:
> + $ref: /schemas/types.yaml#/definitions/string
> +
> + offset:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: |
> + Provides the offset of this entry from the start of its parent section.
> +
> + This may be omitted in the description provided by Binman, in which case
> + the value is calculated as part of image packing.
> +
> + size:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description: |
> + Provides the size of this entry in bytes.
> +
> + This may be omitted in the description provided by Binman, in which case
> + the value is calculated as part of image packing.
So AFAIU, binman will take none/one/both of "offset" and "size" as
inputs and will pass them to the output unmodified, instead adding a
"reg" pair of their calculated final values?
Is there a schema-computational way to ensure that "reg" has to contain
the same values as "offset" and "size"? Or is that not a restriction at
all and "reg" overrides the others?
> +
> + reg:
> + description: |
> + Defines the offset and size of this entry, with reference to its parent
> + image / section.
> +
> + Note This is typically omitted in the description provided to Binman,
> + since the value is calculated as part of image packing. Separate
> + properties are provided for the size and offset of an entry, so that it is
> + easy to specify none, one or both. The `reg` property is the only one that
> + needs to be looked at once the image has been built.
> +
Do we not need a $ref for "reg"? Is there anything applicable?
BTW, I'm not that familiar with device-tree interpretation, I
occasionally saw 'reg' being used as an <offset size> pair, and was
mostly just asking if it's appropriate.
(Also TIL "ranges", and I'm imagining ranges = <0 $size 4G-$size 4G>; as
an end-at-4gb replacement/generalization :P, but I know, later, later.)
> +required:
> + - compatible
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + firmware {
> + image {
> + compatible = "data,image";
> + #address-cells = <1>;
> + $size-cells = <1>;
> +
> + u-boot at 0 {
> + compatible = "data,u-boot";
> + reg = <0 0xa0000>;
> + };
> +
> + atf-bl31 at 0x100000 {
> + compatible = "data,atf-bl31";
> + reg = <0x100000 0x20000>;
> + };
> + };
> + };
> diff --git a/dtschema/schemas/firmware/image.yaml b/dtschema/schemas/firmware/image.yaml
> new file mode 100644
> index 0000000..949b067
> --- /dev/null
> +++ b/dtschema/schemas/firmware/image.yaml
> @@ -0,0 +1,77 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright 2023 Google LLC
> +
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/firmware/image.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Binman firmware layout
> +
> +maintainers:
> + - Simon Glass <sjg at chromium.org>
> +
> +description: |
> + The image node provides a layout for firmware, used when packaging firmware
> + from multiple projects. For now it just supports a very simple set of
> + features, as a starting point for discussion.
> +
> + The Binman tool processes this node to produce a final image which can be
> + loaded into suitable storage device. Documentation is at:
> +
> + https://u-boot.readthedocs.io/en/latest/develop/package/binman.html
> +
> + The current image-description format is here:
> +
> + https://u-boot.readthedocs.io/en/latest/develop/package/binman.html#image-description-format
> +
> + It is desirable to reference the image from the storage-device node, perhaps
> + using an image-desc property:
> +
> + spiflash at 0 {
> + compatible = "spidev", "jedec,spi-nor";
> + image-desc = <&image>;
Bikeshedding, but maybe "layout" or "data,layout" would be nicer.
> + };
> +
> + Note that the intention is to change Binman to use whatever schema is agreed
> + here.
> +
> +properties:
> + $nodename:
> + const: binman
Doesn't match the example, and I guess you mean "^[-a-z]+(-[0-9]+)?$"
like the entry one.
> +
> + compatible:
> + const: data,image
> +
> + "#address-cells":
> + const: 1
> +
> + "#size-cells":
> + const: 1
> +
> +required:
> + - compatible
> + - "#address-cell"
> + - "#size-cells"
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + firmware {
> + image {
> + compatible = "data,image";
> + #address-cells = <1>;
> + $size-cells = <1>;
> +
> + u-boot at 0 {
> + compatible = "data,u-boot";
> + reg = <0 0xa0000>;
> + };
> +
> + atf-bl31 at 0x100000 {
> + compatible = "data,atf-bl31";
> + reg = <0x100000 0x20000>;
> + };
> + };
> + };
More information about the U-Boot
mailing list