IssueTracker

We would like to have something like this for the image description:

        ec-rw {
                compatible = "cros-ec,flash-layout";
                type = "section";
                offset = <0x40000>;
                size = <0x40000>;
                rw_fw: rw-fw {
                        type = "blob";
                        filename = "zephyr_rw.bin";
                        rw-fwid {
                                offset-from-sym = <&zephyr>, "current_image_data", <4>;
                                type = "text";
                                size = <32>;
                                text-label = "version";
                        };
                };
        };

The offset-from-sym provides three parameters:

- phandle of the entry to look at (containing ELF file)
- symbol table to look up in that ELF file (to get the offset)
- value to add to that offset (here, 4)

So rw-fwid is located *within* the zephyr_rw.bin blob at that position ((char *)&current_image_data + 4).

This means that binman grabs that blob but then overwrites 32 bytes of it with the version string.

Finally, that rw-fwid needs to appear in the FMAP produced by the image, if that is not automatic.