Messages in this thread | | | Date | Wed, 02 Jun 2004 10:59:15 +0200 | From | Markus Lidel <> | Subject | Re: Problem with ioremap which returns NULL in 2.6 kernel |
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Hello,
Davide Rossetti 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 > I saw the same problem on a PCI card with a 128MB BAR. it is triggered > on an Tyan opteron mobo, while on a old Dell P4 mobo it is ok. I
Ah, so it could maybe a mainboard problem?
> followed a bit the source code for ioremap and found two places in which > it can fail, > area = get_vm_area(size, VM_IOREMAP); > if (!area) > return NULL; > addr = area->addr; > if (remap_area_pages(VMALLOC_VMADDR(addr), phys_addr, size, flags)) { > vfree(addr); > return NULL; > } > I had not time to add debug printk and recompila the kernel to check > which one is faulty... > The strange thing is that the BARs seems to be laid out correctly, so it > does not look like a bios bug...
But even if it's not a bug, maybe a BIOS update would help...
I'll check this out too...
>>> 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? > we tried with half and it was ok, then we moved up a bit and found the > maximum around 80MB I think...
Okay, i'll let try it out with only 64MB.
Thanks for your help!
Best regards,
Markus Lidel ------------------------------------------ Markus Lidel (Senior IT Consultant)
Shadow Connect GmbH Carl-Reisch-Weg 12 D-86381 Krumbach Germany
Phone: +49 82 82/99 51-0 Fax: +49 82 82/99 51-11
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