serial tty name
liu.h.jason at gmail.com
Sun Dec 18 23:49:11 EST 2011
2011/12/19 Shawn Guo <shawn.guo at freescale.com>:
> On Wed, Dec 14, 2011 at 09:31:59AM -0600, Rob Herring wrote:
>> On 12/14/2011 08:43 AM, Richard Zhao wrote:
>> > How to map different uart port to ttymxc0 (take imx for example)?
>> > In rootfs, it usually "getty ttymxc0" to get
>> > serial console. And the rootfs may be shared by different boards.
>> > Traditionaly way is to set right platform device ID.
>> > But with DT, UART2 always generate ttymxc1, UART3 for ttymxc2. You
>> > always needs to modify the getty command when your change another board.
>> > Is there a way to fix it?
>> That's what the aliases are for.
> I understand it differently. The aliases was introduced to help
> tty/serial driver identify the correct hardware port for given serial
> node from device tree. (Ab)using it to fool 'console' setting may
> eventually confuse users, saying they will think the uart port on his
> board is UART0.
We absolutely need document this in detail to avoid confusion. Otherwise,
the ARM DT support will also mess up in the end.
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