On Fri, Jan 09, 2009 at 02:39:31PM -0800, H. Peter Anvin wrote:Suresh Siddha wrote:Here X is trying to map first 8KB of memory using /dev/mem. ExistingWhy was 0-4 KB marked as non-RAM? It is most definitely RAM, and should
code treats first 0-4KB of memory as non-RAM and 4KB-8KB as RAM. Recent
code changes don't allow to map memory with different attributes
at the same time.
be WB.
While in reality it is RAM, we have CONFIG_STRICT_DEVMEM which doesn't allow
apps to map RAM pages using /dev/mem. And to allow app's to map the
legacy 0-4KB bios data page, we consider it as non-RAM.