On Fri, Sep 30, 2005 at 12:15:04PM +0200, GaLi wrote: > In the IDE BusMaster DMA specification : > > "The control registers for the controller are allocated via the > devices Base Address register at offset 0x20 in PCI configuration > space." > > If I read the word at offset 0x20 in the PCI configuration space, I get > 0xc001. But if I boot qemu with a linux live-cd, it tells me that BM-DMA > is at 0xc000
If the least significant bit in a BAR is 1, it means that you're dealing with I/O space (as opposed to memory space.) For BARs referencing I/O space, the upper 30 bits encode the address, and for memory space BARs, the upper 28 bits encode the address. So, 0xc001 means "I/O space BAR, base address 0xc000." --L _______________________________________________ Qemu-devel mailing list Qemu-devel@nongnu.org http://lists.nongnu.org/mailman/listinfo/qemu-devel
