Andre Albsmeier wrote:
[CC'ing this to Rui Paulo since he tried to help me a while ago]I have written a driver that is a child of hostb (similar to agp) for RELENG_7. However, on some chipsets (e.g. i975) it has to read some memory locations (not pci configuration space) which were registered by acpi as system resources. Since my driver is a child of hostb0, I have no idea of how to access this memory area. Here is a devinfo -r to make things clear: nexus0 acpi0 Interrupt request lines: 9 I/O ports: 0x10-0x1f 0x22-0x3f ... 0x800-0x87f I/O memory addresses: 0xc0000-0xdffff 0xe0000-0xfffff 0xf0000000-0xf3ffffff 0xfec00000-0xfec00fff 0xfed13000-0xfed19fff <--- the memory needed 0xfed1c000-0xfed1ffff .... 0xfed20000-0xfed3ffff 0xfff00000-0xffffffff cpu0 coretemp0 acpi_throttle0 ACPI I/O ports: 0x810-0x813 cpufreq0 cpu1 coretemp1 pcib0 pci0 I/O ports: 0x170-0x177 0x376 hostb0 I/O memory addresses: 0xe4000000-0xe7ffffff MYDRIVER0 <--- my driver agp0 pcib1 pci7 vgapci0 Interrupt request lines: 16 I had the same problem under RELENG_6 six month ago which could be solved by a bus_set_resource() but since the driver now attaches to hostb, this is not possible anymore. Earlier, I was given the hint to attach as a child of acpi (see the old mail attached below) but in this case I didn't have access to the hostb registers which I need as well. The only thing I see is: Attach two drivers -- one as child of acpi and another as child of hostb and let them communicate somehow (no idea how to do this). I have also done crazy things like searching for acpi0 and trying to bus_alloc_resource() the memory I am interested in but this also failed. Or is it possible to free(!) somehow the address space from acpi0 and pass it to hostb0 so I can bus_alloc_resource() it? Thanks a lot for all ideas, -Andre
You can probably make two drivers in one which cooperate to allow access to both sets of resources.
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