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Re: PCI-card memory not mapped

On Saturday, Feb 22, 2003, at 03:00 Europe/Paris, Amanda Walker wrote:


The configuration has not failed. Your driver is responsible for creating the mappings.

I more or less worked around by creating two IOMemoryDescriptors with physical address as read from bar0 and bar1 and sizes of 0x800 and 0x4000 as read out from IORegistry, and call IOMemoryDescriptor's map method which returns an IOMemoryMap. As far as I am today it seems I can talk to the card but I do not know whether am I living dangerously or not... Will my code break when interrupts come into play or DMA?

I would look at an example PCI driver. The "AppleIntel8255x" driver (which you can check out from the Darwin CVS repository) is a good example, since it also shows how to set up DMA and interrupts. Basically, in your start routine you will want to make one or more calls of the form:

IOMemoryMap *map0;
map0 = nub->mapDeviceMemoryWithRegister(kIOPCIConfigBaseAddress0);


I'm afraid you missed my previous mail. In fact the call above returns NULL!! To be more precise:

mapReg0 = fPCIDevice->mapDeviceMemoryWithRegister( kIOPCIConfigBaseAddress0 );
//returns with mapReg0 = NULL

Than if I try:
base0 = fPCIDevice->configRead32(kIOPCIConfigBaseAddress0);
// ok base0 is a valid address, the same that I can see in IORegistry...
IOMemoryDescriptor* memDesc0 = IOMemoryDescriptor::withPhysicalAddress(
(IOPhysicalAddress) base0,
(IOByteCount) 0x800,
kIODirectionOutIn);
// returns a valid memDesc0
if ( memDesc0 != NULL) {
mapReg0 = memDesc0->map(kernel_task,0,(kIOMapAnywhere | kIOMapDefaultCache),0,0);
mapReg0->retain();
}

and bingo I have a valid mapReg0 and my code works. The question is how or why possibly
fPCIDevice->mapDeviceMemoryWithRegister( kIOPCIConfigBaseAddress0 )
fails?


_/ _/ _/ Bela Farago "Hi-Yo c'est l'echo"
_/ _/ _/ mailto:email@hidden
_/ _/ _/ Institut Laue-Langevin
_/ _/ _/ BP:156, 38042 Grenoble Cedex 9, France
_/ _/_/_/_/ _/_/_/_/ tel:(33)(0)4.76.20.73.47 fax:(33)(0)4.76.48.39.06


_/ _/ _/ Bela Farago "Hi-Yo c'est l'echo"
_/ _/ _/ mailto:email@hidden
_/ _/ _/ Institut Laue-Langevin
_/ _/ _/ BP:156, 38042 Grenoble Cedex 9, France
_/ _/_/_/_/ _/_/_/_/ tel:(33)(0)4.76.20.73.47 fax:(33)(0)4.76.48.39.06
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References: 
 >Re: PCI-card memory not mapped (From: Amanda Walker <email@hidden>)



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