Fix the options and protocols used by the loadx command. ...

From 3cd9702 Mon Sep 17 00:00:00 2001
From: Owen Kirby <osk@exegin.com>
Date: Thu, 8 May 2014 13:27:11 -0700
Subject: [PATCH] Fix the options and protocols used by the loadx command.

It seems like the loadx command was improperly copy/pasted from the loady
implementation, and was trying to load files using the ymodem protocol. This
patch should fix the command so that it uses xmodem, implements the -t option
and outputs the correct baudrate being used.

Signed-off-by: Owen Kirby <osk@exegin.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

commands: loady: fix Y-Modem/G option name in help message ...

Actually loady command uses '-g' option for Y-Modem/G mode
selection; see loady() function:

    while ((opt = getopt(argc, argv, "b:t:g")) > 0) {
        switch (opt) {
    ...
        case 'g':
            is_ymodemg = 1;
            break;

By mistake help message show '-y' option for Y-Modem/G mode
selection.

This patch fixes the problem.

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

console: factorise function to get the first enabled console ...

rename it to console_get_first_active

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

commands: remove old Y-Modem implementation ...

As a new implementation of Y-Modem protocol is available,
switch from old implementation to the new one :
 - remove old xyzModem* files
 - remove old command loady2
 - rename command loady2 to loady

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Tested-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

commands: change Y-Modem implementation ...

The current Y-Modem implementation has some limitations:
 - Y-Modem/G protocol is not supported
 - Multiple files (aka. batch) transfers are not supported
 - Transfer speed over fast lines (USB console) is slow
 - Code is not trivial to maintain (personnal opinion)

This implementation tries to address all these points by
introducing loady2 command.

The effects are :
 - transfer speed for Y-Modem over USB jumps from 2kBytes/s
   to 180kBytes/s
 - transfer speed for Y-Modem/G jumps to 200kBytes/s
 - multiple file transfers are possible

This command was tested on a USB console and UART 9600bps
serial line :
 - NAKs (and retransmissions) were tested for faulty
   serial lines
 - multiple file transfers were tested
 - Y-Modem, Y-Modem/G and X-Modem transfers were tested

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Tested-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>