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spl: document 'chosen/u-boot, spl-boot-device'

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To let the full U-Boot know where it was booted from (i.e. which of
the entries in /chosen/u-boot,spl-boot-order' contained a valid
image), we define (and document) /chosen/u-boot,spl-boot-device as the
property that could/should automatically be injected by SPL.

This commit only contains a documentation change, which documents the
new property and the intended usage.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Tested-by: Klaus Goger <klaus.goger@theobroma-systems.com>
This commit is contained in:
Philipp Tomsich 2018-05-24 17:15:51 +02:00
parent de5dd4c4e3
commit 2aa4abc1bd
1 changed files with 10 additions and 0 deletions
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10
doc/device-tree-bindings/chosen.txt
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@ -73,3 +73,13 @@ Example
u-boot,spl-boot-order = "same-as-spl", &sdmmc, "/sdhci@fe330000";
};
};
u-boot,spl-boot-device property
-------------------------------
This property is a companion-property to the u-boot,spl-boot-order and
will be injected automatically by the SPL stage to notify a later stage
of where said later stage was booted from.
You should not define this property yourself in the device-tree, as it
may be overwritten without warning.