Yocto and Build Linux

According to the docs:

http://www.rocketboards.org/foswiki/documentation/alterasocdevelopmentboardyoctogettingstarted

bitbake virtual/kernel and bitbake linux-altera are identical. For me the first command works but the second

does not. I get this error when running linux-altera

ERROR: Function failed: Fetcher failure for URL: 'git://git.rocketboards.org/linux-socfpga.git;protocol=http;branch=socfpga-3.11-rel'. The command git ls-remote http://git.rocketboards.org/linux-socfpga.git socfpga-3.11-rel gave empty output unexpectedly

Anyhow, the second works but then I get no socfpga_cyclone5.dtb after a call to bitbake altera-image.

Any ideas what to do?

EDIT:

Actually, this is the error:

ERROR: Multiple .bb files are due to be built which each provide virtual/kernel (/home/bobo/yocto/meta-altera/recipes-kernel/linux/linux-altera_3.11.bb /home/bobo/yocto/meta-altera/recipes-kernel/linux/linux-altera-dist.bb).
 This usually means one provides something the other doesn't and should.