On Wed, 2008-05-07 at 23:31 -0700, Spence Nick wrote: > > In our case the memory area is reserved so that the main processor will > not touch it except when mapped by the mem driver.
Then you should completely carve it out of the LMB's which will ensure it's not seen as RAM by /dev/mem and not mapped by the linear mapping (well, the later depends ... if it's carved out of the top of RAM it should work fine, if it's a hole, I'm not sure we handle holes in the linear mapping on 32 bits). > Alternative solutions are to modify the user space code to flush out the > caches by reading a large area, or to implement a board specific > ppc_md.phys_mem_access_prot() function to do this. > > Either of these will meet my needs, but this will leave the O_SYNC flag > ignored on the PowerPC architecture in 2.6, but honored by Linux 2.4 and > other architectures. Probably not a problem for most people. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
