Re: [Xen-devel] xen/arm: How to hide console UART from dom0?

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2013-05-31 at 13:50 +0100, Julien Grall wrote:
> > I tried seeing if I could remember the name of the console DT device but
> > in dt_uart_init I get:
> >         dt_node_full_name
> >         => /smb/motherboard/iofpga@3,00000000/uart@0c000
> >         dt_node_name => uart
> > Neither of which match the required "uart@0c000" which
> > fdt_next_dom0_node has in its hand.
> 
> By default, the part after @ is removed. If needed, it's easily to
> provide a pointer to "uart@0c000" but I'm not sure it's usefull for us.

Other than for this purpose I expect not, lets not worry about it.

> > Julien, I know you have longer term plans to create dom0's device tree
> > from Xen's unflattened device tree using the used_by field but I suppose
> > that won't be happening for 4.3 at this stage? Is there a better short
> > term hack we can make here? How do you work around this issue?
> 
> 
> Right. It's possible to add a property: status = "disabled"; on the
> specific node (here the UART). Linux will interpret this property and
> won't use the node.
> For the moment, this property is not used by Xen so you can directly add
> it on your DTS.

Thanks, this will suffice as long as we do proper construction of the
dom0 fdt before making Xen obey this property ;-)

Ian.




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