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Date: Thu, 30 May 2013 05:49:48 -0700 (PDT)
From: wolfking <wolfking2000@msn.com>
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Subject: Re: can't access PCIe card under sbc8548
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tiejun.chen wrote
> On 05/30/2013 03:32 PM, wolfking wrote:
>> (continued)
>>    I traced the 8139too.c when it uses pci_iomap, the pci_iomap called
>> the
>> ioport_map. The difference between 8139 and my PCIe card lies in the
>> "port" value :
>> void __iomem *ioport_map(unsigned long port, unsigned int len)
>> {
>> 	return (void __iomem *) (port + _IO_BASE);
> 
> _IO_BASE is equal to isa_io_base. So if this is not zero, I think there's
> a isa 
> bridge in your platform. So you can access these I/O ports based on that
> isa 
> bridge/bus with ioreadx/iowritex.
> 
> I tried ioread8/iowriet8 after ioremap, it doesn't work
> 
>> }
>>    in 8139too.c, the "port" value is 0x1000; for my PCIe card, the "port"
>> value
>> is 0xfefff000. And the value is got from pci_resource_start. So you see,
>> the
> 
> But this means the port is as memory-mapped so ioremap() should be
> workable in 
> this case. Then out_bex/in_bex should be fine.
> 
> Tiejun
> 
> _______________________________________________
> Linuxppc-dev mailing list

> Linuxppc-dev@.ozlabs

> https://lists.ozlabs.org/listinfo/linuxppc-dev





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