Messages in this thread | | | Date | Tue, 01 Jun 2004 19:32:33 -0400 | From | Jeff Garzik <> | Subject | Re: Problem with ioremap which returns NULL in 2.6 kernel |
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Markus Lidel wrote: > Hello, > > Jeff Garzik wrote: > >>> could someone help me with a ioremap problem. If there are two >>> controllers plugged in, the ioremap request for the first controller >>> is successfull, but the second returns NULL. Here is the output of >>> the driver: >>> i2o: Checking for PCI I2O controllers... >>> i2o: I2O controller on bus 0 at 72. >>> i2o: PCI I2O controller at 0xD0000000 size=134217728 >>> I2O: MTRR workaround for Intel i960 processor >>> i2o/iop0: Installed at IRQ17 >>> i2o: I2O controller on bus 0 at 96. >>> i2o: PCI I2O controller at 0xD8000000 size=134217728 >>> i2o: Unable to map controller. >> >> If "size=xxxx" indicates the size you are remapping, then that's > > > Yep, it is... > >> probably too large an area to be remapping. Try remapping only the >> memory area needed, and not the entire area. > > > Is there a way, to increase the size, which could be remapped, or is > there a way, to find out what is the maximum size which could be remapped?
My preferred approach would be: consider that the hardware does not need the entire 0x8000000-byte area mapped. Plain and simple.
This is a "don't do that" situation, and that renders the other questions moot :) You should only be mapping what you need to map.
Jeff
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