Hi All, I am trying to add a GPU as PCI device in full system. The kernel expects the shadowed ROM for vga devices to be at 0xc0000, and would attempt to read the ROM from there. However, we start mapping the memory range from address 0x0, and that would result in any accesses to vga ROM to go through the memory and not the device itself.
As a workaround, we can check for this particular address range before dispatching the incoming request and send it to pio instead of memory. However, this would be more of a hack, and would not solve the issue for KVM cpu. I was wondering if anyone faced similar issues, or have any feedback on how to properly handle this. Looking at how this is handled in real systems, is seems like DRAM is often not mapped starting from address 0x0. Other than simplicity, is there any particular reason for mapping DRAM starting from address zero? Best, -- Pouya Fotouhi PhD Candidate Department of Electrical and Computer Engineering University of California, Davis _______________________________________________ gem5-dev mailing list gem5-dev@gem5.org http://m5sim.org/mailman/listinfo/gem5-dev
