As you may know, there’s a pretty big issue with importing drivers in Configuration Manager 2012 R2 after applying Service Pack 1. Importing drivers inexplicably increased the size of driver packages to the point of task sequences being unusable. There were some workarounds posted where you could import the drivers with PowerShell and avoid the issue, but a hotfix has been released to resolve the issue. You can download and install it here:
You may need to delete your driver packages and reimport your drivers to get them back down to a reasonable driver package size. Please note that Cumulative Update 1 for SCCM 2012 R2 SP1 must already be applied for this hotfix to install properly.