On 09/05/2011 07:35 PM, Willy Lambert wrote:
> 2011/9/5 Wolfgang Grandegger <[email protected]>
> 
>> On 09/04/2011 09:09 PM, Willy Lambert wrote:
>>> 2011/9/3 Wolfgang Grandegger <[email protected]>
>> ...
>>>> What CAN hardware are you using?
>>>
>>>
>>> Motherboad and CAN stack :
>>>
>> http://www.advantech.com/products/PCM-3362/mod_2B69DA4C-D506-4AEA-8CC3-F6E58E3CBC87.aspx
>>> http://www.ixxat.com/pc_i_04_104_en.html
>>
>> OK...
>>
>>>> And what bus is it
>>>> connected to? Why do I ask? In "arch/x86/Kconfig" there is:
>>>>
>>>>  # x86_64 have no ISA slots, but can have ISA-style DMA.
>>>>  config ISA_DMA_API
>>>>        bool "ISA-style DMA support" if (X86_64 && EXPERT)
>>>>        default y
>>>>        help
>>>>          Enables ISA-style DMA support for devices requiring such
>>>> controllers.
>>>>          If unsure, say Y.
>>>>
>>>>  if X86_32
>>>>
>>>>  config ISA
>>>>        bool "ISA support"
>>>>        ---help---
>>>>          Find out whether you have ISA slots on your motherboard.  ISA
>> is
>>>> the
>>>>          name of a bus system, i.e. the way the CPU talks to the other
>>>> stuff
>>>>          inside your box.  Other bus systems are PCI, EISA, MicroChannel
>>>>          (MCA) or VESA.  ISA is an older system, now being displaced by
>>>> PCI;
>>>>          newer boards don't support it.  If you have ISA, say Y,
>> otherwise
>>>> N.
>>>>
>>>>
>>>> Maybe the assumption that the x86_64 does not have ISA slots is wrong
>> and
>>>> we
>>>> should fix that instead of moving to a platform driver like Oliver
>>>> suggested.
>>
>> Intel Atom N450 on that board supports the PC/104-Plus bus, which is PCI
>> (not ISA) based, therefore a SJA1000-PCI-driver seems more appropriate.
>> Do you find the SJA1000 device with "lspci -vv"?

Ah, at a closer look, the PC/104-Plus is an extension of the PC/104 from
factor with an additional connector for PCI. It therefore still supports
ISA bus communication, which the IXXAT PC-I 04/104 board uses.

Therefore I'm going to prepare a patch removing the "X86_32" restriction
for CONFIG_ISA above. Sorry for confusion.

Wolfgang.
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