[coreboot] SeaBIOS wit USB3.0 hub and USB3.0 devide behind the hub

Martin Roth gaumless at gmail.com
Wed Jan 28 04:36:41 CET 2015

Hi May,
   I just wanted to expand on your finding.  On Rangeley, the USB 
buffers MUST be pushed low because the USB controller isn't allowed to 
write into the 0xe0000 - 0xfffff area.  The processor is the only device 
that can write to that area.  The restricted area might be larger - I 
can't recall.  This restriction on Rangeley is the main reason that the 
MALLOC_UPPERMEMORY option exists in SeaBIOS.  (Thanks Kevin.)


On 01/13/2015 06:21 PM, May Park wrote:
> Hey Werner,
> Thanks for the reply.
> I found what's wrong with my build for my Rangeley CRB, the usb issue 
> is caused by memory allocation, have to disable
> in SeaBIOS .config file.
> all the USB devices work.
> And also thanks to Kuzmichev Viktor, for his long log in which I found 
> this little clue.
> thank you all :)
> May
> ------------------------------------------------------------------------

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