I've allocated a 16k chunk of system isa memory at the bridge level. From time to time children need a hunk of this memory to map in their attribute memory. The attribute memory has various config registers in it as well as the CIS. My thinking on the matter was that I'd allocate the 16k chunk at bridge attach time, and then just give it out to the children who are requesting a memory area be mapped in as the default. However, when I go to do this, the allocation fails because the bridge is holding the allocation.