> On 19 Jul 2018, at 19:46, Mathias Kresin <[email protected]> wrote:
>
>
> To get the dt compiler accepting the overlapping partitions without a
> warning, a style was chosen completely different from all other dts
> files in the target [maintenance reason]. Furthermore, nodes sharing
> the same reg are usually (always?) expressed as child nodes in the
> devicetree similar to [technical reason]:
>
> partitions {
> compatible = "fixed-partitions";
>
> partition@0 {
> reg = <0 0x3000>;
>
> subpartition@0 {
> reg = <0 0x1000>;
> };
>
> subpartition@1000 {
> reg = <0x1000 0x2000>;
> };
> };
>
> partition@3000 {
> reg = <0x3000 0x10000>;
> };
> };
>
> To my knowledge, the above isn't possible with fixed-partitions.
I don’t see why. AIUI DTS syntax is respected, all nodes have a unique name and
all nodes refer to their top boundary as the unit address.
> Which
> either means fixed-partitions misses a feature or someone tries to use
> it in a way not intended.
The above is in line with the canonical way to define partitions in DTS, as
documented in Documentation/devicetree/bindings/mtd/partition.txt
This method is apparently used in all bcm targets, as well as ath79, ipq and
lantiq. I’d suggest that _not_ using this method is a bug, and not the correct
way to go, as evidenced by the aforementioned documentation. Quoting:
For backwards compatibility partitions as direct subnodes of the flash
device are
supported. This use is discouraged.
T.
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