On Mon, Nov 02, 2009 at 03:56:08PM +0200, Avi Kivity wrote: > On 11/02/2009 03:51 PM, Kevin O'Connor wrote: >> On Mon, Nov 02, 2009 at 03:32:54PM +0200, Avi Kivity wrote: >>> Is seabios clobbering memory? Gleb/Kevin? >> I have not tested with the -kernel option before. I believe you may >> be running into the clearing of memory that PMM does - see >> malloc_finalize() in src/pmm.c. The PMM spec requires that low memory >> be cleared before starting the boot process. > Likely. Alex, does -kernel use memory below 1MB? Can it be moved > elsewhere?
I've confirmed that commenting out the memset in malloc_finalize() fixes the reported problem. Removing the memset is probably okay for the short-term, but it would contradict the PMM spec, so we'll need some kind of long-term solution. Also, SeaBIOS wont clear high-memory, but nothing stops SeaBIOS from using high memory for scratch space during init. > If not, we probably need a protocol where the option rom loads the > kernel from qemu, rather than qemu poking the kernel into memory. Yes, I'd prefer to see this. In earlier emails, Gleb made a reference to a qemu-cfg "stream" interface that is used for acpi tables - maybe the kernel could be put in one of the streams and the rom could copy it into ram on boot. Let me know what you wish to do. -Kevin
