On Wed, Aug 04, 2010 at 12:33:18PM +0100, Richard W.M. Jones wrote: > On Wed, Aug 04, 2010 at 12:52:23PM +0300, Avi Kivity wrote: > > On 08/04/2010 12:24 PM, Richard W.M. Jones wrote: > > >>> > > >>>Just like the initrd? > > >>There isn't enough address space for a 100MB initrd in ROM. > > >Because of limits of the original PC, sure, where you had to fit > > >everything in 0xa0000-0xfffff or whatever it was. > > > > > >But this isn't a real PC. > > > > > >You can map the read-only memory anywhere you want. > > > > I wasn't talking about the 1MB limit, rather the 4GB limit. Of > > that, 3-3.5GB are reserved for RAM, 0.5-1GB for PCI. Putting large > > amounts of ROM in that space will cost us PCI space. > > I'm only allocating 500MB of RAM, so there's easily enough space to > put a large ROM, with tons of room for growth (of both RAM and ROM). > Yes, even real hardware has done this. The Weitek math copro mapped > itself in at physical memory addresses c0000000 (a 32 MB window IIRC). > c0000000 is 3G. This is where PCI windows starts usually (configurable in the chipset). Don't see anything unusual in this particular HW. -- Gleb. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
