On 2011-09-14 10:17, Avi Kivity wrote: > On 09/14/2011 10:42 AM, Alexander Graf wrote: >> On 14.09.2011, at 09:11, Avi Kivity wrote: >> >>> On 09/13/2011 10:39 PM, Blue Swirl wrote: >>>> > >>>> > Here is the problem: Both the vram and the ISA range get mapped into >>>> > system address space, but the former eclipses the latter as it shows >>>> up >>>> > earlier in the list and has the same priority. This picture changes >>>> with >>>> > the chain-4 alias which has prio 2, thus maps over the vram. >>>> > >>>> > It looks to me like the ISA address space is either misplaced at >>>> > 0x80000000 or is not supposed to be mapped at all on PPC. Comments? >>>> >>>> Since there is no PCI-ISA bridge, ISA address space shouldn't exist. >>> >>> Where does the vga device sit then? >> >> On the PCI bus? :) >> > > I thought it was std vga, which is an ISA device.
There are both types (ISA-only and PCI). > > Anyway PCI supports the vga region at 0xa0000-0xc0000. Where is it > supposed to be mapped? ...but not all PCI bridges make use of this feature / forward legacy requests. Jan -- Siemens AG, Corporate Technology, CT T DE IT 1 Corporate Competence Center Embedded Linux
