Ingo Molnar schrieb:
> * Stefan Richter <stefanr@s5r6.in-berlin.de> wrote:
>
>   
>> On my x86-32 test system, none of the devices gets an MMIO region 
>> above the 4G map.  (Reconfigured with CONFIG_RESOURCES_64BIT=y while 
>> having CONFIG_HIGHMEM4G=y, like in Thomas M's .config.)
>>     
>
> 64-bit ioremap on x86 never worked AFAIK, the whole API is using 32-bit 
> physical addresses which is limited to 4GB. But ... this bug does have 
> the feeling of the wrong IO side physical memory being mapped. (0xff 
> data means there's no device there - typical of non-existent RAM/IO)
>
> could you please pull the x86/latest tree to do a kernel pagetable dump 
> for us? You can pull it via the instructions here:
>
>    http://people.redhat.com/mingo/x86.git/README
>
> then enable CONFIG_DEBUG_KERNEL=y and CONFIG_X86_PTDUMP=y boot the 
> kernel so that ohci1394 doesnt work. Then dump the pagetables and other 
> hw info via:
>
>    http://people.redhat.com/mingo/cfs-scheduler/tools/cfs-debug-info.sh
>
> send us the cfs-debug-info file that gets generated. We'll be able to 
> tell from that whether your ioremap's are OK. (x86/latest will also 
> printk all ioremap()s and results that are done)
>
>   
See attached file.