[yocto] Checksum of an external file

[Anton Gerasimov]

> I don't think so. You need to write an external script that copies the
> file into the layer, then runs bitbake. The recipe should simply refer
> to the file via SRC_URI file fetcher.

Thank you a lot, that actually works without copying: SRC_URI works with
absolute pathes as well. Such a straightworward solution has never
occured to me for some reason.

- Anton