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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