I am running a simple test with a software initiated DMA transfer from one bigphysarea allocated buffer to another bigphysarea allocated buffer. The destination buffer shows no data changes once the transfer is done.
However, I perform the same simple test using __get_dma_pages() rather then the bigphysarea_alloc_pages() and the destination does get the data transfer. Is there a reason this should fail for bigphysarea? I understand the low memory addresses needed for the DMA controller on some platforms, but I didnt think that limitation existed on the PPC. Besides that, the bigphysarea returns low memory address anyway. Anyone have an idea why? An old archive email had someone with a similar problem, but there were no follow-ups to the message. I have linux 2.4.27-pre3 patched, ppc-linux-gcc (GCC) 3.3.3 (DENX ELDK 3.1.1 3.3.3-9), U-Boot 1.1.2, and GMS 440gx board. thanks, Kevin
