git.linaro.org supports scalable git clones over HTTP. This was done to eliminate huge resources consumption by clones over GIT and "smart" HTTP protocols by serving files directly with Apache server. To clone read-only git tree use following link:
git clone http://git.linaro.org/*git-ro*/people/<username>/<gitproject>.git
Your own tree is accessible over "dumb" HTTP protocol by default after creation and you need additional steps to setup only if you are using objects/info/alternates mechanism to borrow objects from other object stores. Then you have to setup objects/info/http-alternates file with appropriate contents (links to remote repositories) and ensure that alternate repository is also accessible over HTTP protocol.
Please refer to https://wiki.linaro.org/Process/GitHostingAccounts for more information.