On Fri, May 7, 2010 at 6:26 PM, Artyom Tarasenko <atar4q...@googlemail.com> wrote: > phys_page_find (exec.c) returns sometimes a page for addresses where > nothing is connected. > > One example, done with qemu-system-sparc -M SS-20 > > ok f13ffff0 2f spacec@ . > > // The address translates correctly, in cpu_physical_memory_rw > // addr== 0xff13ffff0 (where nothing is connected) > // but then phys_page_find returns a nonzero and produces > > Unassigned mem read access of 1 byte to 0000000ff15ffff0 from xxxxx > > (note the "5" in the line above where "3" is expected) > > I wonder if this is only true for non-wired addresses, or whether > phys_page_find can also > find wrong pages for the addresses where something is connected? > > Or is my assumption is wrong and phys_page_find can return a page for > not-connected > addresses and the bug is actually in cpu_physical_memory_rw ? > > Is the qemu algorithm of working with the physical address space > described somewhere?
I tried to switch devices off and found that the bug is triggered by registering escc. It's harder to debug without escc, so I can't tell whether something else is causing the problem too. Is escc addressing somehow special? >Is the qemu algorithm of working with the physical address space described >somewhere? I guess no one knows it anymore, since no-one cared to answer within a half year :-/. -- Regards, Artyom Tarasenko solaris/sparc under qemu blog: http://tyom.blogspot.com/
