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Date: Thu, 28 Apr 2005 22:24:50 -0600
From: Scott Long <scottl@samsco.org>
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To: Julian Elischer <julian@elischer.org>
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cc: Scott Long <scottl@FreeBSD.org>
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Subject: Re: cvs commit: src/sys/i386/conf PAE
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Julian Elischer wrote:
> Scott Long wrote:
> 
>> scottl      2005-04-29 02:59:19 UTC
>>
>>   FreeBSD src repository
>>
>>   Modified files:
>>     sys/i386/conf        PAE   Log:
>>   For whatever reason, we don't allow USB on PAE.  Since it's a 
>> dependency
>>   for EHCI, exclude that driver also.
>>     Revision  Changes    Path
>>   1.15      +1 -0      src/sys/i386/conf/PAE
> 
> 
> EHCI can actually support 64 bit physical addresses.
> We haven't doen it yet but it will probably happen.
> of course with bus-dma specifying addresses < 4G, it should still work
> with > 32 bit memory addresses (bounce buffering).
> 
> 

Yeah, I can't think of a good reason why the USB stack shouldn't
work on PAE since it does work on real 64-bit platforms.  Maybe
there are some 'sizeof(void*) != sizeof(bus_addr_t)' spots in it?  My
only concern was making the tree build, though.  Feel free to correct
it.  I can probably make a PAE system available if you'd like.

Scott