Re: [Xen-devel] [PATCH] xen/serial: setup UART idle mode for OMAP

[Oleksandr Dmytryshyn <oleksandr.dmytryshyn@xxxxxxxxxxxxxxx>]

In our case We've added an additional fake node to the device tree with
UART MMIO range for Xen and Xen mapped this MMIO range
for the Kernel 3.8. By default UART has wrong configuration in OMAP.

Oleksandr Dmytryshyn | Product Engineering and Development
GlobalLogic
M +38.067.382.2525
www.globallogic.com

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On Fri, Dec 5, 2014 at 4:20 PM, Julien Grall <julien.grall@xxxxxxxxxx> wrote:
> Hi Oleksandr,
>
> On 05/12/14 13:46, Oleksandr Dmytryshyn wrote:
>> UART is not able to receive bytes when idle mode is not
>> configured properly. When we use Xen with old Linux
>> Kernel (for example 3.8) this kernel configures UART
>> idle mode even if the UART node in device tree is absent.
>
> I don't understand how the kernel can configure the UART as the MMIO
> range is not mapped. Is there another way to set the idle mode?
>
> Regards,
>
> --
> Julien Grall

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