Re: Re: kernel crash in fault.c

Hi Raj,
Thanks for your response.
The problem is solved after converting the bus address to virtual 
address using bus_to_virt () function.
Thanks again for ur replies.
with best regards,
Nanda

On Mon, 29 Jul 2002 S Rajkumar wrote :
>Nandakumar NarayanaSwamy wrote:
>
>>Hi Raj,
>>Thanks for ur immediate response.
>>
>>There are about three PCI devices in the board. When the linux 
>>boots up, it detects all the three devices and allocates memory. 
>>The driver for other 2 devices is built with the kernel. I am 
>>trying to load  the driver for the third device.
>>
>>I am trying to use the memory that is already allocated to this 
>>device during bootup. When i try to write a word in this address 
>>space, the system crashes. Am i missing somewhere?
>
>
>
>    Probably yes ;)... The PCI address allocated by the boot 
>loader will be within the
>range which is hardwired or routed by the system controller to 
>the PCI controller.
>If the value is proper you would not get a page fault. There are 
>two possibilities
>
>1)  The address assigned by the boot loader to your device might 
>be outside the
>PCI address window.  Do a cat /proc/pci and see what is the 
>address range allocated for your device.
>
>2) You are doing something wrong when you ioremap the PCI IO 
>address range to
>KSEG2 space.  Try using the memory address range.
>
>I believe you wouldn't get a page fault if the problem was just 
>not enabling PCI IO or MEM
>access.
>
>BTW what is the badvaddr when the system faults ?
>
>>>The PCI address you accessed doesn't seem to be within the PCI 
>>>address window.
>>>Check the address range setup in your systems PCI controller. 
>>>Or you might be
>>>facing problems in the ioremap of the PCI address. So check 
>>>both the ioremap'ed
>>>address and the PCI address and see if they are OK.
>>>
>
>

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