[Qemu-discuss] phys_page_find() returning &sections[PHYS_SECTION_UNASSIGNED]

[Programmingkid]

I'm having problems with the pci_dma_read() function. When using a Mac OS X 
guest, the data that this function returns is all zeros. After doing a lot of 
instruction tracing, I tracked the problem to a function called 
phys_page_find(). It always returns &sections[PHYS_SECTION_UNASSIGNED]. What I 
would like to know is what is an unassigned section? How is memory suppose to 
be assigned? 

The pci_dma_read() function call I'm tracking takes place in rtl8139.c in case 
anyone would like to know.