Add a compatible string for binman, so we can extend fixed-partitions
in various ways.
Signed-off-by: Simon Glass <[email protected]>
---
Changes in v4:
- Change subject line
Changes in v3:
- Drop fixed-partition additional compatible string
- Drop fixed-partitions from the example
- Mention use of compatible instead of label
Changes in v2:
- Drop mention of 'enhanced features' in fixed-partitions.yaml
- Mention Binman input and output properties
- Use plain partition@xxx for the node name
.../bindings/mtd/partitions/binman.yaml | 63 +++++++++++++++++++
.../bindings/mtd/partitions/partitions.yaml | 1 +
MAINTAINERS | 5 ++
3 files changed, 69 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mtd/partitions/binman.yaml
diff --git a/Documentation/devicetree/bindings/mtd/partitions/binman.yaml b/Documentation/devicetree/bindings/mtd/partitions/binman.yaml
new file mode 100644
index 000000000000..7d6c8bd738f5
--- /dev/null
+++ b/Documentation/devicetree/bindings/mtd/partitions/binman.yaml
@@ -0,0 +1,63 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright 2023 Google LLC
+
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mtd/partitions/binman.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Binman firmware layout
+
+maintainers:
+ - Simon Glass <[email protected]>
+
+select: false
+
+description: |
+ The binman node provides a layout for firmware, used when packaging firmware
+ from multiple projects. It is based on fixed-partitions, with some
+ extensions, but uses 'compatible' to indicate the contents of the node, to
+ avoid perturbing or confusing existing installations which use 'label' for a
+ particular purpose.
+
+ Binman supports properties used as inputs to the firmware-packaging process,
+ such as those which control alignment of partitions. This binding addresses
+ these 'input' properties. For example, it is common for the 'reg' property
+ (an 'output' property) to be set by Binman, based on the alignment requested
+ in the input.
+
+ Once processing is complete, input properties have mostly served their
+ purpose, at least until the firmware is repacked later, e.g. due to a
+ firmware update. The 'fixed-partitions' binding should provide enough
+ information to read the firmware at runtime, including decompression if
+ needed.
+
+ Documentation for Binman is available at:
+
+ https://u-boot.readthedocs.io/en/latest/develop/package/binman.html
+
+ with the current image-description format at:
+
+ https://u-boot.readthedocs.io/en/latest/develop/package/binman.html#image-description-format
+
+allOf:
+ - $ref: /schemas/mtd/partitions/fixed-partitions.yaml#
+
+properties:
+ compatible:
+ const: binman
+
+additionalProperties: false
+
+examples:
+ - |
+ partitions {
+ compatible = "binman";
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ partition@100000 {
+ label = "u-boot";
+ reg = <0x100000 0xf00000>;
+ };
+ };
diff --git a/Documentation/devicetree/bindings/mtd/partitions/partitions.yaml b/Documentation/devicetree/bindings/mtd/partitions/partitions.yaml
index 1dda2c80747b..849fd15d085c 100644
--- a/Documentation/devicetree/bindings/mtd/partitions/partitions.yaml
+++ b/Documentation/devicetree/bindings/mtd/partitions/partitions.yaml
@@ -15,6 +15,7 @@ maintainers:
oneOf:
- $ref: arm,arm-firmware-suite.yaml
+ - $ref: binman.yaml
- $ref: brcm,bcm4908-partitions.yaml
- $ref: brcm,bcm947xx-cfe-partitions.yaml
- $ref: fixed-partitions.yaml
diff --git a/MAINTAINERS b/MAINTAINERS
index c934244acc31..ebc8158fe67d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3536,6 +3536,11 @@ F: Documentation/filesystems/bfs.rst
F: fs/bfs/
F: include/uapi/linux/bfs_fs.h
+BINMAN
+M: Simon Glass <[email protected]>
+S: Supported
+F: Documentation/devicetree/bindings/mtd/partitions/binman*
+
BITMAP API
M: Yury Norov <[email protected]>
R: Andy Shevchenko <[email protected]>
--
2.42.0.609.gbb76f46606-goog
Add two compatible for binman entries, as a starting point for the
schema.
Note that, after discussion on v2, we decided to keep the existing
meaning of label so as not to require changes to existing userspace
software when moving to use binman nodes to specify the firmware
layout.
Signed-off-by: Simon Glass <[email protected]>
---
Changes in v4:
- Correct selection of multiple compatible strings
Changes in v3:
- Drop fixed-partitions from the example
- Use compatible instead of label
Changes in v2:
- Use plain partition@xxx for the node name
.../mtd/partitions/binman-partition.yaml | 49 +++++++++++++++++++
1 file changed, 49 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mtd/partitions/binman-partition.yaml
diff --git a/Documentation/devicetree/bindings/mtd/partitions/binman-partition.yaml b/Documentation/devicetree/bindings/mtd/partitions/binman-partition.yaml
new file mode 100644
index 000000000000..35a320359ec1
--- /dev/null
+++ b/Documentation/devicetree/bindings/mtd/partitions/binman-partition.yaml
@@ -0,0 +1,49 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright 2023 Google LLC
+
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mtd/partitions/binman-partition.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Binman partition
+
+maintainers:
+ - Simon Glass <[email protected]>
+
+select: false
+
+description: |
+ This corresponds to a binman 'entry'. It is a single partition which holds
+ data of a defined type.
+
+allOf:
+ - $ref: /schemas/mtd/partitions/partition.yaml#
+
+properties:
+ compatible:
+ oneOf:
+ - const: binman,entry # generic binman entry
+ - items:
+ - const: u-boot # u-boot.bin from U-Boot project
+ - const: atf-bl31 # bl31.bin or bl31.elf from TF-A project
+
+additionalProperties: false
+
+examples:
+ - |
+ partitions {
+ compatible = "binman";
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ partition@100000 {
+ compatible = "u-boot";
+ reg = <0x100000 0xf00000>;
+ };
+
+ partition@200000 {
+ compatible = "atf-bl31";
+ reg = <0x200000 0x100000>;
+ };
+ };
--
2.42.0.609.gbb76f46606-goog
Add three properties for controlling alignment of partitions, aka
'entries' in binman.
For now there is no explicit mention of hierarchy, so a 'section' is
just the 'binman' node.
These new properties are inputs to the packaging process, but are also
needed if the firmware is repacked, to ensure that alignment
constraints are not violated. Therefore they are provided as part of
the schema.
Signed-off-by: Simon Glass <[email protected]>
---
(no changes since v2)
Changes in v2:
- Fix 'a' typo in commit message
.../mtd/partitions/binman-partition.yaml | 39 +++++++++++++++++++
1 file changed, 39 insertions(+)
diff --git a/Documentation/devicetree/bindings/mtd/partitions/binman-partition.yaml b/Documentation/devicetree/bindings/mtd/partitions/binman-partition.yaml
index 35a320359ec1..8e8a3b6d4d14 100644
--- a/Documentation/devicetree/bindings/mtd/partitions/binman-partition.yaml
+++ b/Documentation/devicetree/bindings/mtd/partitions/binman-partition.yaml
@@ -28,6 +28,42 @@ properties:
- const: u-boot # u-boot.bin from U-Boot project
- const: atf-bl31 # bl31.bin or bl31.elf from TF-A project
+ align:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ This sets the alignment of the entry. The entry offset is adjusted
+ so that the entry starts on an aligned boundary within the containing
+ section or image. For example ‘align = <16>’ means that the entry will
+ start on a 16-byte boundary. This may mean that padding is added before
+ the entry. The padding is part of the containing section but is not
+ included in the entry, meaning that an empty space may be created before
+ the entry starts. Alignment should be a power of 2. If ‘align’ is not
+ provided, no alignment is performed.
+
+ align-size:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ This sets the alignment of the entry size. For example, to ensure
+ that the size of an entry is a multiple of 64 bytes, set this to 64.
+ While this does not affect the contents of the entry within binman
+ itself (the padding is performed only when its parent section is
+ assembled), the end result is that the entry ends with the padding
+ bytes, so may grow. If ‘align-size’ is not provided, no alignment is
+ performed.
+
+ align-end:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ This sets the alignment of the end of an entry with respect to the
+ containing section. Some entries require that they end on an alignment
+ boundary, regardless of where they start. This does not move the start
+ of the entry, so the contents of the entry will still start at the
+ beginning. But there may be padding at the end. While this does not
+ affect the contents of the entry within binman itself (the padding is
+ performed only when its parent section is assembled), the end result is
+ that the entry ends with the padding bytes, so may grow. If ‘align-end’
+ is not provided, no alignment is performed.
+
additionalProperties: false
examples:
@@ -40,10 +76,13 @@ examples:
partition@100000 {
compatible = "u-boot";
reg = <0x100000 0xf00000>;
+ align-size = <0x1000>;
+ align-end = <0x10000>;
};
partition@200000 {
compatible = "atf-bl31";
reg = <0x200000 0x100000>;
+ align = <0x4000>;
};
};
--
2.42.0.609.gbb76f46606-goog
On Mon, Oct 09, 2023 at 04:04:13PM -0600, Simon Glass wrote:
> Add a compatible string for binman, so we can extend fixed-partitions
> in various ways.
>
> Signed-off-by: Simon Glass <[email protected]>
> ---
>
> Changes in v4:
> - Change subject line
>
> Changes in v3:
> - Drop fixed-partition additional compatible string
> - Drop fixed-partitions from the example
> - Mention use of compatible instead of label
>
> Changes in v2:
> - Drop mention of 'enhanced features' in fixed-partitions.yaml
> - Mention Binman input and output properties
> - Use plain partition@xxx for the node name
>
> .../bindings/mtd/partitions/binman.yaml | 63 +++++++++++++++++++
> .../bindings/mtd/partitions/partitions.yaml | 1 +
> MAINTAINERS | 5 ++
> 3 files changed, 69 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/mtd/partitions/binman.yaml
>
> diff --git a/Documentation/devicetree/bindings/mtd/partitions/binman.yaml b/Documentation/devicetree/bindings/mtd/partitions/binman.yaml
> new file mode 100644
> index 000000000000..7d6c8bd738f5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mtd/partitions/binman.yaml
> @@ -0,0 +1,63 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright 2023 Google LLC
> +
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mtd/partitions/binman.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Binman firmware layout
> +
> +maintainers:
> + - Simon Glass <[email protected]>
> +
> +select: false
> +
> +description: |
> + The binman node provides a layout for firmware, used when packaging firmware
> + from multiple projects. It is based on fixed-partitions, with some
> + extensions, but uses 'compatible' to indicate the contents of the node, to
> + avoid perturbing or confusing existing installations which use 'label' for a
> + particular purpose.
> +
> + Binman supports properties used as inputs to the firmware-packaging process,
> + such as those which control alignment of partitions. This binding addresses
> + these 'input' properties. For example, it is common for the 'reg' property
> + (an 'output' property) to be set by Binman, based on the alignment requested
> + in the input.
> +
> + Once processing is complete, input properties have mostly served their
> + purpose, at least until the firmware is repacked later, e.g. due to a
> + firmware update. The 'fixed-partitions' binding should provide enough
> + information to read the firmware at runtime, including decompression if
> + needed.
> +
> + Documentation for Binman is available at:
> +
> + https://u-boot.readthedocs.io/en/latest/develop/package/binman.html
> +
> + with the current image-description format at:
> +
> + https://u-boot.readthedocs.io/en/latest/develop/package/binman.html#image-description-format
> +
> +allOf:
> + - $ref: /schemas/mtd/partitions/fixed-partitions.yaml#
> +
> +properties:
> + compatible:
> + const: binman
This couldn't possibly pass validation. Including fixed-partitions.yaml
says the compatible must be one thing and this says something else.
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + partitions {
> + compatible = "binman";
> + #address-cells = <1>;
> + #size-cells = <1>;
> +
> + partition@100000 {
> + label = "u-boot";
> + reg = <0x100000 0xf00000>;
> + };
> + };
> diff --git a/Documentation/devicetree/bindings/mtd/partitions/partitions.yaml b/Documentation/devicetree/bindings/mtd/partitions/partitions.yaml
> index 1dda2c80747b..849fd15d085c 100644
> --- a/Documentation/devicetree/bindings/mtd/partitions/partitions.yaml
> +++ b/Documentation/devicetree/bindings/mtd/partitions/partitions.yaml
> @@ -15,6 +15,7 @@ maintainers:
>
> oneOf:
> - $ref: arm,arm-firmware-suite.yaml
> + - $ref: binman.yaml
> - $ref: brcm,bcm4908-partitions.yaml
> - $ref: brcm,bcm947xx-cfe-partitions.yaml
> - $ref: fixed-partitions.yaml
> diff --git a/MAINTAINERS b/MAINTAINERS
> index c934244acc31..ebc8158fe67d 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -3536,6 +3536,11 @@ F: Documentation/filesystems/bfs.rst
> F: fs/bfs/
> F: include/uapi/linux/bfs_fs.h
>
> +BINMAN
> +M: Simon Glass <[email protected]>
> +S: Supported
> +F: Documentation/devicetree/bindings/mtd/partitions/binman*
> +
> BITMAP API
> M: Yury Norov <[email protected]>
> R: Andy Shevchenko <[email protected]>
> --
> 2.42.0.609.gbb76f46606-goog
>
On Mon, Oct 09, 2023 at 04:04:14PM -0600, Simon Glass wrote:
> Add two compatible for binman entries, as a starting point for the
> schema.
>
> Note that, after discussion on v2, we decided to keep the existing
> meaning of label so as not to require changes to existing userspace
> software when moving to use binman nodes to specify the firmware
> layout.
>
> Signed-off-by: Simon Glass <[email protected]>
> ---
>
> Changes in v4:
> - Correct selection of multiple compatible strings
>
> Changes in v3:
> - Drop fixed-partitions from the example
> - Use compatible instead of label
>
> Changes in v2:
> - Use plain partition@xxx for the node name
>
> .../mtd/partitions/binman-partition.yaml | 49 +++++++++++++++++++
> 1 file changed, 49 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/mtd/partitions/binman-partition.yaml
>
> diff --git a/Documentation/devicetree/bindings/mtd/partitions/binman-partition.yaml b/Documentation/devicetree/bindings/mtd/partitions/binman-partition.yaml
> new file mode 100644
> index 000000000000..35a320359ec1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mtd/partitions/binman-partition.yaml
> @@ -0,0 +1,49 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright 2023 Google LLC
> +
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mtd/partitions/binman-partition.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Binman partition
> +
> +maintainers:
> + - Simon Glass <[email protected]>
> +
> +select: false
So this schema is never used. 'select: false' is only useful if
something else if referencing the schema.
> +
> +description: |
> + This corresponds to a binman 'entry'. It is a single partition which holds
> + data of a defined type.
> +
> +allOf:
> + - $ref: /schemas/mtd/partitions/partition.yaml#
> +
> +properties:
> + compatible:
> + oneOf:
> + - const: binman,entry # generic binman entry
'binman' is not a vendor. You could add it if you think that's useful.
Probably not with only 1 case...
> + - items:
> + - const: u-boot # u-boot.bin from U-Boot project
> + - const: atf-bl31 # bl31.bin or bl31.elf from TF-A project
Probably should use the new 'tfa' rather than old 'atf'. Is this the
only binary for TFA? The naming seems inconsistent in that every image
goes in (or can go in) a bl?? section. Why does TFA have it but u-boot
doesn't? Perhaps BL?? is orthogonal to defining what is in each
partition. Perhaps someone more familar with all this than I am can
comment.
Once you actually test this, you'll find you are specifying:
compatible = "u-boot", "atf-bl31";
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + partitions {
> + compatible = "binman";
> + #address-cells = <1>;
> + #size-cells = <1>;
> +
> + partition@100000 {
> + compatible = "u-boot";
> + reg = <0x100000 0xf00000>;
> + };
> +
> + partition@200000 {
> + compatible = "atf-bl31";
> + reg = <0x200000 0x100000>;
> + };
> + };
> --
> 2.42.0.609.gbb76f46606-goog
>
On Mon, Oct 09, 2023 at 04:04:15PM -0600, Simon Glass wrote:
> Add three properties for controlling alignment of partitions, aka
> 'entries' in binman.
>
> For now there is no explicit mention of hierarchy, so a 'section' is
> just the 'binman' node.
>
> These new properties are inputs to the packaging process, but are also
> needed if the firmware is repacked, to ensure that alignment
> constraints are not violated. Therefore they are provided as part of
> the schema.
>
> Signed-off-by: Simon Glass <[email protected]>
> ---
>
> (no changes since v2)
>
> Changes in v2:
> - Fix 'a' typo in commit message
>
> .../mtd/partitions/binman-partition.yaml | 39 +++++++++++++++++++
> 1 file changed, 39 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/mtd/partitions/binman-partition.yaml b/Documentation/devicetree/bindings/mtd/partitions/binman-partition.yaml
> index 35a320359ec1..8e8a3b6d4d14 100644
> --- a/Documentation/devicetree/bindings/mtd/partitions/binman-partition.yaml
> +++ b/Documentation/devicetree/bindings/mtd/partitions/binman-partition.yaml
> @@ -28,6 +28,42 @@ properties:
> - const: u-boot # u-boot.bin from U-Boot project
> - const: atf-bl31 # bl31.bin or bl31.elf from TF-A project
>
> + align:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description:
> + This sets the alignment of the entry. The entry offset is adjusted
> + so that the entry starts on an aligned boundary within the containing
> + section or image. For example ‘align = <16>’ means that the entry will
> + start on a 16-byte boundary. This may mean that padding is added before
Only your example defines that alignment is in bytes.
> + the entry. The padding is part of the containing section but is not
> + included in the entry, meaning that an empty space may be created before
> + the entry starts. Alignment should be a power of 2. If ‘align’ is not
> + provided, no alignment is performed.
Would be nice to have some constraints. Unfortunately, no way to say
'power of 2' in json-schema (we could add something possibly), so the
only way is:
enum: [ 2, 4, 8, 16, 32, 64, ... ]
Kind of verbose if we add all 31 possibilities...
Could also do this:
minium: 2
maximum: 0x80000000
multipleOf: 2
> +
> + align-size:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description:
> + This sets the alignment of the entry size. For example, to ensure
> + that the size of an entry is a multiple of 64 bytes, set this to 64.
> + While this does not affect the contents of the entry within binman
> + itself (the padding is performed only when its parent section is
> + assembled), the end result is that the entry ends with the padding
> + bytes, so may grow. If ‘align-size’ is not provided, no alignment is
> + performed.
> +
> + align-end:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description:
> + This sets the alignment of the end of an entry with respect to the
> + containing section. Some entries require that they end on an alignment
> + boundary, regardless of where they start. This does not move the start
> + of the entry, so the contents of the entry will still start at the
> + beginning. But there may be padding at the end. While this does not
> + affect the contents of the entry within binman itself (the padding is
> + performed only when its parent section is assembled), the end result is
> + that the entry ends with the padding bytes, so may grow. If ‘align-end’
> + is not provided, no alignment is performed.
> +
> additionalProperties: false
>
> examples:
> @@ -40,10 +76,13 @@ examples:
> partition@100000 {
> compatible = "u-boot";
> reg = <0x100000 0xf00000>;
> + align-size = <0x1000>;
> + align-end = <0x10000>;
> };
>
> partition@200000 {
> compatible = "atf-bl31";
> reg = <0x200000 0x100000>;
> + align = <0x4000>;
> };
> };
> --
> 2.42.0.609.gbb76f46606-goog
>
Hi Rob,
On Tue, 24 Oct 2023 at 09:16, Rob Herring <[email protected]> wrote:
>
> On Mon, Oct 09, 2023 at 04:04:14PM -0600, Simon Glass wrote:
> > Add two compatible for binman entries, as a starting point for the
> > schema.
> >
> > Note that, after discussion on v2, we decided to keep the existing
> > meaning of label so as not to require changes to existing userspace
> > software when moving to use binman nodes to specify the firmware
> > layout.
> >
> > Signed-off-by: Simon Glass <[email protected]>
> > ---
> >
> > Changes in v4:
> > - Correct selection of multiple compatible strings
> >
> > Changes in v3:
> > - Drop fixed-partitions from the example
> > - Use compatible instead of label
> >
> > Changes in v2:
> > - Use plain partition@xxx for the node name
> >
> > .../mtd/partitions/binman-partition.yaml | 49 +++++++++++++++++++
> > 1 file changed, 49 insertions(+)
> > create mode 100644 Documentation/devicetree/bindings/mtd/partitions/binman-partition.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/mtd/partitions/binman-partition.yaml b/Documentation/devicetree/bindings/mtd/partitions/binman-partition.yaml
> > new file mode 100644
> > index 000000000000..35a320359ec1
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/mtd/partitions/binman-partition.yaml
> > @@ -0,0 +1,49 @@
> > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> > +# Copyright 2023 Google LLC
> > +
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/mtd/partitions/binman-partition.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Binman partition
> > +
> > +maintainers:
> > + - Simon Glass <[email protected]>
> > +
> > +select: false
>
> So this schema is never used. 'select: false' is only useful if
> something else if referencing the schema.
OK. Is there a user guide to this somewhere? I really don't understand
it very well.
>
> > +
> > +description: |
> > + This corresponds to a binman 'entry'. It is a single partition which holds
> > + data of a defined type.
> > +
> > +allOf:
> > + - $ref: /schemas/mtd/partitions/partition.yaml#
> > +
> > +properties:
> > + compatible:
> > + oneOf:
> > + - const: binman,entry # generic binman entry
>
> 'binman' is not a vendor. You could add it if you think that's useful.
> Probably not with only 1 case...
I think it is best to use this for generic things implemented by
binman, rather than some other project. For example, binman supports a
'fill' region. It also supports sections which are groups of
sub-entries. So we will likely start with half a dozen of these and it
will likely grow: binman,fill, binman,section, binman,files
If we don't use 'binman', what do you suggest?
>
> > + - items:
> > + - const: u-boot # u-boot.bin from U-Boot project
> > + - const: atf-bl31 # bl31.bin or bl31.elf from TF-A project
>
> Probably should use the new 'tfa' rather than old 'atf'. Is this the
> only binary for TFA? The naming seems inconsistent in that every image
> goes in (or can go in) a bl?? section. Why does TFA have it but u-boot
> doesn't? Perhaps BL?? is orthogonal to defining what is in each
> partition. Perhaps someone more familar with all this than I am can
> comment.
From what I can tell TF-A can produce all sorts of binaries, of which
bl31 is one. U-Boot can also produce lots of binaries, but its naming
is different (u-boot, u-boot-spl, etc.). Bear in mind that U-Boot is
used on ARM, where this terminology is defined, and on x86 (for
example), where it is not.
>
> Once you actually test this, you'll find you are specifying:
>
> compatible = "u-boot", "atf-bl31";
I don't understand that, sorry. I'll send a v5 and see if the problem goes away.
>
>
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > + - |
> > + partitions {
> > + compatible = "binman";
> > + #address-cells = <1>;
> > + #size-cells = <1>;
> > +
> > + partition@100000 {
> > + compatible = "u-boot";
> > + reg = <0x100000 0xf00000>;
> > + };
> > +
> > + partition@200000 {
> > + compatible = "atf-bl31";
> > + reg = <0x200000 0x100000>;
> > + };
> > + };
> > --
> > 2.42.0.609.gbb76f46606-goog
> >
Regards,
Simon
Hi Simon,
[email protected] wrote on Tue, 24 Oct 2023 14:40:54 -0700:
> Hi Rob,
>
> On Tue, 24 Oct 2023 at 09:16, Rob Herring <[email protected]> wrote:
> >
> > On Mon, Oct 09, 2023 at 04:04:14PM -0600, Simon Glass wrote:
> > > Add two compatible for binman entries, as a starting point for the
> > > schema.
> > >
> > > Note that, after discussion on v2, we decided to keep the existing
> > > meaning of label so as not to require changes to existing userspace
> > > software when moving to use binman nodes to specify the firmware
> > > layout.
> > >
> > > Signed-off-by: Simon Glass <[email protected]>
> > > ---
> > >
> > > Changes in v4:
> > > - Correct selection of multiple compatible strings
> > >
> > > Changes in v3:
> > > - Drop fixed-partitions from the example
> > > - Use compatible instead of label
> > >
> > > Changes in v2:
> > > - Use plain partition@xxx for the node name
> > >
> > > .../mtd/partitions/binman-partition.yaml | 49 +++++++++++++++++++
> > > 1 file changed, 49 insertions(+)
> > > create mode 100644 Documentation/devicetree/bindings/mtd/partitions/binman-partition.yaml
> > >
> > > diff --git a/Documentation/devicetree/bindings/mtd/partitions/binman-partition.yaml b/Documentation/devicetree/bindings/mtd/partitions/binman-partition.yaml
> > > new file mode 100644
> > > index 000000000000..35a320359ec1
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/mtd/partitions/binman-partition.yaml
> > > @@ -0,0 +1,49 @@
> > > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> > > +# Copyright 2023 Google LLC
> > > +
> > > +%YAML 1.2
> > > +---
> > > +$id: http://devicetree.org/schemas/mtd/partitions/binman-partition.yaml#
> > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > +
> > > +title: Binman partition
> > > +
> > > +maintainers:
> > > + - Simon Glass <[email protected]>
> > > +
> > > +select: false
> >
> > So this schema is never used. 'select: false' is only useful if
> > something else if referencing the schema.
>
> OK. Is there a user guide to this somewhere? I really don't understand
> it very well.
The example-schema.yaml at the root of the dt-bindings directory is
well commented.
> > > +description: |
> > > + This corresponds to a binman 'entry'. It is a single partition which holds
> > > + data of a defined type.
> > > +
> > > +allOf:
> > > + - $ref: /schemas/mtd/partitions/partition.yaml#
> > > +
> > > +properties:
> > > + compatible:
> > > + oneOf:
> > > + - const: binman,entry # generic binman entry
> >
> > 'binman' is not a vendor. You could add it if you think that's useful.
> > Probably not with only 1 case...
>
> I think it is best to use this for generic things implemented by
> binman, rather than some other project. For example, binman supports a
> 'fill' region. It also supports sections which are groups of
> sub-entries. So we will likely start with half a dozen of these and it
> will likely grow: binman,fill, binman,section, binman,files
>
> If we don't use 'binman', what do you suggest?
>
> >
> > > + - items:
> > > + - const: u-boot # u-boot.bin from U-Boot project
> > > + - const: atf-bl31 # bl31.bin or bl31.elf from TF-A project
> >
> > Probably should use the new 'tfa' rather than old 'atf'. Is this the
> > only binary for TFA? The naming seems inconsistent in that every image
> > goes in (or can go in) a bl?? section. Why does TFA have it but u-boot
> > doesn't? Perhaps BL?? is orthogonal to defining what is in each
> > partition. Perhaps someone more familar with all this than I am can
> > comment.
>
> From what I can tell TF-A can produce all sorts of binaries, of which
> bl31 is one. U-Boot can also produce lots of binaries, but its naming
> is different (u-boot, u-boot-spl, etc.). Bear in mind that U-Boot is
> used on ARM, where this terminology is defined, and on x86 (for
> example), where it is not.
>
> >
> > Once you actually test this, you'll find you are specifying:
> >
> > compatible = "u-boot", "atf-bl31";
>
> I don't understand that, sorry. I'll send a v5 and see if the problem goes away.
For me this means the partition contains U-Boot and TF-A, which is
probably not what you want. I believe Rob is saying that how you define
the compatible property above does not match the examples below. Did
you run make dt_binding_check?
Also, do you really need to say which software project provides a
component? Would using "bl31", "bl33", etc be enough? Or maybe you
could have eg. "bl31-tf-a" and "bl31-u-boot-spl" (in this order) for
clarity? This way one knows which stage a partition contains and also
the software project which provided it.
To be honest I still don't fully get where you want to go and I believe
a more complete schema would probably help, with different examples, to
catch what you need and why.
> > > +additionalProperties: false
> > > +
> > > +examples:
> > > + - |
> > > + partitions {
> > > + compatible = "binman";
> > > + #address-cells = <1>;
> > > + #size-cells = <1>;
> > > +
> > > + partition@100000 {
> > > + compatible = "u-boot";
> > > + reg = <0x100000 0xf00000>;
> > > + };
> > > +
> > > + partition@200000 {
> > > + compatible = "atf-bl31";
> > > + reg = <0x200000 0x100000>;
> > > + };
> > > + };
> > > --
> > > 2.42.0.609.gbb76f46606-goog
> > >
>
> Regards,
> Simon
Thanks,
Miquèl
Hi Miquel,
On Wed, 25 Oct 2023 at 08:11, Miquel Raynal <[email protected]> wrote:
>
> Hi Simon,
>
> [email protected] wrote on Tue, 24 Oct 2023 14:40:54 -0700:
>
> > Hi Rob,
> >
> > On Tue, 24 Oct 2023 at 09:16, Rob Herring <[email protected]> wrote:
> > >
> > > On Mon, Oct 09, 2023 at 04:04:14PM -0600, Simon Glass wrote:
> > > > Add two compatible for binman entries, as a starting point for the
> > > > schema.
> > > >
> > > > Note that, after discussion on v2, we decided to keep the existing
> > > > meaning of label so as not to require changes to existing userspace
> > > > software when moving to use binman nodes to specify the firmware
> > > > layout.
> > > >
> > > > Signed-off-by: Simon Glass <[email protected]>
> > > > ---
> > > >
> > > > Changes in v4:
> > > > - Correct selection of multiple compatible strings
> > > >
> > > > Changes in v3:
> > > > - Drop fixed-partitions from the example
> > > > - Use compatible instead of label
> > > >
> > > > Changes in v2:
> > > > - Use plain partition@xxx for the node name
> > > >
> > > > .../mtd/partitions/binman-partition.yaml | 49 +++++++++++++++++++
> > > > 1 file changed, 49 insertions(+)
> > > > create mode 100644 Documentation/devicetree/bindings/mtd/partitions/binman-partition.yaml
> > > >
> > > > diff --git a/Documentation/devicetree/bindings/mtd/partitions/binman-partition.yaml b/Documentation/devicetree/bindings/mtd/partitions/binman-partition.yaml
> > > > new file mode 100644
> > > > index 000000000000..35a320359ec1
> > > > --- /dev/null
> > > > +++ b/Documentation/devicetree/bindings/mtd/partitions/binman-partition.yaml
> > > > @@ -0,0 +1,49 @@
> > > > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> > > > +# Copyright 2023 Google LLC
> > > > +
> > > > +%YAML 1.2
> > > > +---
> > > > +$id: http://devicetree.org/schemas/mtd/partitions/binman-partition.yaml#
> > > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > > +
> > > > +title: Binman partition
> > > > +
> > > > +maintainers:
> > > > + - Simon Glass <[email protected]>
> > > > +
> > > > +select: false
> > >
> > > So this schema is never used. 'select: false' is only useful if
> > > something else if referencing the schema.
> >
> > OK. Is there a user guide to this somewhere? I really don't understand
> > it very well.
>
> The example-schema.yaml at the root of the dt-bindings directory is
> well commented.
OK I had forgotten about that, thank you.
>
> > > > +description: |
> > > > + This corresponds to a binman 'entry'. It is a single partition which holds
> > > > + data of a defined type.
> > > > +
> > > > +allOf:
> > > > + - $ref: /schemas/mtd/partitions/partition.yaml#
> > > > +
> > > > +properties:
> > > > + compatible:
> > > > + oneOf:
> > > > + - const: binman,entry # generic binman entry
> > >
> > > 'binman' is not a vendor. You could add it if you think that's useful.
> > > Probably not with only 1 case...
> >
> > I think it is best to use this for generic things implemented by
> > binman, rather than some other project. For example, binman supports a
> > 'fill' region. It also supports sections which are groups of
> > sub-entries. So we will likely start with half a dozen of these and it
> > will likely grow: binman,fill, binman,section, binman,files
> >
> > If we don't use 'binman', what do you suggest?
> >
> > >
> > > > + - items:
> > > > + - const: u-boot # u-boot.bin from U-Boot project
> > > > + - const: atf-bl31 # bl31.bin or bl31.elf from TF-A project
> > >
> > > Probably should use the new 'tfa' rather than old 'atf'. Is this the
> > > only binary for TFA? The naming seems inconsistent in that every image
> > > goes in (or can go in) a bl?? section. Why does TFA have it but u-boot
> > > doesn't? Perhaps BL?? is orthogonal to defining what is in each
> > > partition. Perhaps someone more familar with all this than I am can
> > > comment.
> >
> > From what I can tell TF-A can produce all sorts of binaries, of which
> > bl31 is one. U-Boot can also produce lots of binaries, but its naming
> > is different (u-boot, u-boot-spl, etc.). Bear in mind that U-Boot is
> > used on ARM, where this terminology is defined, and on x86 (for
> > example), where it is not.
> >
> > >
> > > Once you actually test this, you'll find you are specifying:
> > >
> > > compatible = "u-boot", "atf-bl31";
> >
> > I don't understand that, sorry. I'll send a v5 and see if the problem goes away.
>
> For me this means the partition contains U-Boot and TF-A, which is
> probably not what you want. I believe Rob is saying that how you define
> the compatible property above does not match the examples below. Did
> you run make dt_binding_check?
Yes, but I have not been able to install the correct version with 'pip
install'. So the check about not being an object did not appear for
me.
I have now figured out how to run the latest version locally with the
Linux validation, so will fix these problems in v6.
>
> Also, do you really need to say which software project provides a
> component? Would using "bl31", "bl33", etc be enough? Or maybe you
> could have eg. "bl31-tf-a" and "bl31-u-boot-spl" (in this order) for
> clarity? This way one knows which stage a partition contains and also
> the software project which provided it.
The software project tells binman the filename to pick up and any
processing it might need to use. It is quite an important element of
this schema. Bear in mind that Binman assembles the image...so it must
read in the various files that are needed.
The bl31 terminology is used by ARM but not x86. So using bl31 in the
context of U-Boot would be quite confusing on non-ARM SoCs.
For the stage (or what I call Phase), I have not considered that yet.
The purpose of adding 'bl31' is because TF-A (like U-Boot) produces a
few binaries so we need to specify which one is wanted, which in turn
leads to the filename. We do have the concept of a boot phase in DT
(bootph-pre-ram for example), so I hope to integrate that at some
point, for runtime use. But for the purposes of assembling the image,
it doesn't matter when the phase runs...all that matters is being able
to read in the files which need to be assembled into the image.
>
> To be honest I still don't fully get where you want to go and I believe
> a more complete schema would probably help, with different examples, to
> catch what you need and why.
The full schema is described at [1] and [2]. Note that this may need
to change as I slowly upstream it. The top of [1] describes the
motivation for binman and there is a more detailed talk at [3].
So far I am just trying to describe two things:
- U-Boot (u-boot.bin)
- TF-A BL31 (bl31.elf)
I am doing things in baby steps because even that is quite a
challenge. But I think the linked docs should help explain where it is
heading.
>
> > > > +additionalProperties: false
> > > > +
> > > > +examples:
> > > > + - |
> > > > + partitions {
> > > > + compatible = "binman";
> > > > + #address-cells = <1>;
> > > > + #size-cells = <1>;
> > > > +
> > > > + partition@100000 {
> > > > + compatible = "u-boot";
> > > > + reg = <0x100000 0xf00000>;
> > > > + };
> > > > +
> > > > + partition@200000 {
> > > > + compatible = "atf-bl31";
> > > > + reg = <0x200000 0x100000>;
> > > > + };
> > > > + };
> > > > --
> > > > 2.42.0.609.gbb76f46606-goog
> > > >
Regards,
SImon
[1] https://u-boot.readthedocs.io/en/latest/develop/package/binman.html#image-description-format
[2] https://u-boot.readthedocs.io/en/latest/develop/package/binman.html#entry-documentation
[3] https://elinux.org/Boot_Loaders#U-Boot