Closer to home - the Broadcom code for the Raspberry Pi.
Do you mean the code that has been open source for 3 years now? I do believe the broadcom blob also executes under the vpu not the cpu. It sets up hardware that calls the kernel/the kernel calls. Not code running under the kernel. Any actual modifications to the kernel must be gpl'd. You can't just pre-compile the parts you don't want to open source and never distribute them. This has been discussed to death at length.