upstream u-boot with additional patches for our devices/boards: https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ; Gbit ethernet patch for some LIME2 revisions ; with SPI flash support
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u-boot/doc/device-tree-bindings/mailbox/mailbox.txt

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* Generic Mailbox Controller and client driver bindings
Generic binding to provide a way for Mailbox controller drivers to
assign appropriate mailbox channel to client drivers.
* Mailbox Controller
Required property:
- #mbox-cells: Must be at least 1. Number of cells in a mailbox
specifier.
Example:
mailbox: mailbox {
...
#mbox-cells = <1>;
};
* Mailbox Client
Required property:
- mboxes: List of phandle and mailbox channel specifiers.
Optional property:
- mbox-names: List of identifier strings for each mailbox channel.
Example:
pwr_cntrl: power {
...
mbox-names = "pwr-ctrl", "rpc";
mboxes = <&mailbox 0 &mailbox 1>;
};