Merge branch 'sandbox' of git://git.denx.de/u-boot-blackfin

* 'sandbox' of git://git.denx.de/u-boot-blackfin:
  sandbox: mark os_exit as noreturn
  sandbox: add getopt support
  sandbox: allow processing before main loop
  sandbox: add concept of sandbox state
  sandbox: disable fortification
  sandbox: u-boot.lds: tweak style
  sandbox: add get_{tbclk,ticks}
  sandbox: enable GPIO driver
  sandbox: gpio: add basic driver for simulating GPIOs
  sandbox: add flags for open() call
  sandbox: config: enable fdt and snprintf() options
  sandbox: fdt: add support for CONFIG_OF_CONTROL
  sandbox: add lseek helper
  sandbox: add ifdef protection to os.h
  sandbox: add required header to os.c
  sandbox: sort header files in os.c