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From: Moritz Augsburger <ml+barebox@moritz.augsburger.name>
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Date: Thu, 25 Apr 2019 20:46:13 +0200
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Subject: state/bootchoser and sdhci/sdhost switchover
To: "barebox@lists.infradead.org" <barebox@lists.infradead.org>

Hey,

I'm a bit clueless about using bootchooser/state (together with rauc) on 
raspberry pi.

Inside barebox itself, everything works fine. I defined a state backend 
inside the dt, and I can set/update/read values:

     state: state {
         magic = <0x4d433230>;
         compatible = "barebox,state";
         backend-type = "raw";
         backend = <&backend_state_sd>;
         backend-storage-type = "circular";
         backend-stridesize = <0x800>;
[...]
     };
&sdhci { // extended the original entry
         pinctrl-0 = <&emmc_gpio48>;
         no-sd;
         non-removable;
         status = "okay";
         partitions {
                 compatible = "fixed-partitions";
                 #size-cells = <1>;
                 #address-cells = <1>;
                 backend_state_sd: part@200000 {
                         label = "state_sd";
                         reg = <0x200000 0x200000>;
                 };
         };
};

Linux uses &sdhost, barebox switched to &sdhci in 
ed5d970c16d14aa24edc20b8a096f230a398f7be as it has no driver for the 
sdhost interface. barebox-state doesn't find the storage, as expected:

# barebox-state
of_get_devicepath: cannot find device from node /soc/mmc@7e300000
state: state failed to parse path to backend: No such device
unable to initialize state: Unknown error -19

I would need some way to switch the backend for the state variable to 
the sdhost interface when it is copied into the device tree used for 
booting - or any other good proposal how to deal with the problem.

Best regards
Moritz

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