state/bootchoser and sdhci/sdhost switchover

state/bootchoser and sdhci/sdhost switchover

[Moritz Augsburger]

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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Re: state/bootchoser and sdhci/sdhost switchover

[Sascha Hauer]

On Thu, Apr 25, 2019 at 08:46:13PM +0200, Moritz Augsburger wrote:
> 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.

How about porting the sdhost driver from U-Boot to barebox? This is
probably not what you wanted to hear, but I think porting the driver
mainly requires changing the boilerplate code which shouldn't be too
much effort.

The other solutions I can think of are crude hacks, like sneaking in
the correct device node by adjusting state->of_path in the state code.

Sascha

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