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| author | Philipp Tomsich <philipp.tomsich@theobroma-systems.com> | 2017-09-29 19:27:57 +0200 |
|---|---|---|
| committer | Philipp Tomsich <philipp.tomsich@theobroma-systems.com> | 2017-10-01 00:33:34 +0200 |
| commit | 80e9f88e67398ae65c89af3bace59e7e14debd33 (patch) | |
| tree | 90ab8a48996c395091e57c18a76f2919e920cbe9 /doc | |
| parent | dbad01cab576c12852931c6bf22361b5234c506a (diff) | |
| download | u-boot-80e9f88e67398ae65c89af3bace59e7e14debd33.tar.gz | |
rockchip: spl: support a 'same-as-spl'-specifier in the spl-boot-order
It is often desirable to configure the spl-boot-order (i.e. the order
that SPL probes devices to find the FIT image containing a full U-Boot)
such that it contains 'the same device the SPL stage was booted from'
early on. To support this, we introduce the 'same-as-spl' specifier
for the spl-boot-order property.
This commit adds:
- documentation for the new board_spl_was_booted_from() function that
individual SoCs/boards should provide, if they can determine where
the SPL was booted from
- implements the new board_spl_was_booted_from() stub function
- adds support for handling the 'same-as-spl' specifier and calling
into the per-SoC/per-board support code.
This also updates the documentation for the 'u-boot,spl-boot-order'
property.
Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/device-tree-bindings/chosen.txt | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/doc/device-tree-bindings/chosen.txt b/doc/device-tree-bindings/chosen.txt index 5625d210e8..c96b8f7109 100644 --- a/doc/device-tree-bindings/chosen.txt +++ b/doc/device-tree-bindings/chosen.txt @@ -56,10 +56,20 @@ Each list element of the property should specify a device to be probed in the order they are listed: references (i.e. implicit paths), a full path or an alias is expected for each entry. +A special specifier "same-as-spl" can be used at any position in the +boot-order to direct U-Boot to insert the device the SPL was booted +from there. Whether this is indeed inserted or silently ignored (if +it is not supported on any given SoC/board or if the boot-device is +not available to continue booting from) is implementation-defined. +Note that if "same-as-spl" expands to an actual node for a given +board, the corresponding node may appear multiple times in the +boot-order (as there currently exists no mechanism to suppress +duplicates from the list). + Example ------- / { chosen { - u-boot,spl-boot-order = &sdmmc, "/sdhci@fe330000"; + u-boot,spl-boot-order = "same-as-spl", &sdmmc, "/sdhci@fe330000"; }; }; |