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