Measure boot time using ttyUSBx on host mach?

[Phil Vandry]

On Fri, Nov 26, 2010 at 08:01:39AM +0530, Ranjit Pillai wrote:
> Can access uboot using ttyACM* but would love to have an output like
> http://lists.openmoko.org/nabble.html#nabble-td4204941 with ttyUSBx on
> host mach using terminal program like neocon/picocom. Is it really
> possible to have ttyUSB enabled all the time of so how to acheive
> that?

I do not think that you will be able to do that.

By default with Qi, the Freerunner's console output appears both on
the touchscreen and on the real serial port (accessible with a debug
board).  In order for the Freerunner's console boot-time console
output to be visible through a virtual serial port on the host,
you would have to use the USB Gadget serial driver (/dev/ttyGS*)
as a console device on the Freerunner. I believe that this driver
does not work without help from userspace. Even if you can do that,
it will not work until the whole USB system on the Freerunner has been
initialized so you would miss all the messages that come before that.

-Phil