17twenty

So the Beaglebone uses the file uEnv.txt to store settings as it doesn't have any NAND allocated to do it with, by 
default the file is pretty empty save from the line:

optargs=run_hardware_tests quiet

You may have read a number of things about boot.scr etc  - ignore it, it's not correct.
The bootcmd is hardwired in uboot to do the following (i've seperated it all out to make things clearer) - you can see it by 
interrupting the bootsequence and performing a 'printenv'.

bootcmd=

rajabishek

/**
    Handle multiple socket connections with select and fd_set on Linux
    Raj Abishek <rajabishek@hotmail.com>
*/
  
#include <stdio.h>
#include <string.h>   //strlen
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>   //close

MightyPork

/**
 * USB HID Keyboard scan codes as per USB spec 1.11
 * plus some additional codes
 * 
 * Created by MightyPork, 2016
 * Public domain
 * 
 * Adapted from:
 * https://source.android.com/devices/input/keyboard-devices.html
 */

MightyPork

use std::io;
use std::io::Write;

fn fibo(n:u32) -> u32 {
  if n <= 2 {
    1
  } else {
    let mut prev1 = 1;
    let mut prev2 = 1;
    for _n in 2..n {

MightyPork

----- NEW GAME -----
Secret animal is: duck
What animal is it?
> duck
Game ended.

----- NEW GAME -----
Secret animal is: dog
Is it a duck?
> no

MightyPork

/**
 * Weekday calculation utils.
 *
 * Month and weekday are 1-based, 1 is Monday. 
 * The enums may be replaced by ints at the expense of clarity.
 *
 * Released to the public domain
 */

#include <stdint.h>

MightyPork

Dec  Hex  Char                          Dec  Hex  Char   Dec  Hex  Char   Dec  Hex  Char
--------------                          --------------   --------------   --------------
  0  00h  NUL (null)                     32  20h  SP      64  40h  @       96  60h  `
  1  01h  SOH (start of heading)         33  21h  !       65  41h  A       97  61h  a
  2  02h  STX (start of text)            34  22h  "       66  42h  B       98  62h  b
  3  03h  ETX (end of text)              35  23h  #       67  43h  C       99  63h  c
  4  04h  EOT (end of transmission)      36  24h  $       68  44h  D      100  64h  d
  5  05h  ENQ (enquiry)                  37  25h  %       69  45h  E      101  65h  e
  6  06h  ACK (acknowledge)              38  26h  &       70  46h  F      102  66h  f
  7  07h  BEL (bell)                     39  27h  '       71  47h  G      103  67h  g