Sometimes fetch error occurs because of the network or third party website issues.
Kindly try cleaning the package and try re-compiling:
$ bitbake -c cleanall <package_name>
ex:
$ bitbake -c cleanall libdrm
$ bitbake -k core-image-minimal -c populate_sdk
For further inquiries, please get in touch with mktg@iwave-global.com
Please find the detailed G40M product information in the below link,