[bl] removing useless old file

bootloaders/zero/board_init.c.old

-/*
-  Copyright (c) 2015 Arduino LLC.  All right reserved.
-
-  This library is free software; you can redistribute it and/or
-  modify it under the terms of the GNU Lesser General Public
-  License as published by the Free Software Foundation; either
-  version 2.1 of the License, or (at your option) any later version.
-
-  This library is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
-  See the GNU Lesser General Public License for more details.
-
-  You should have received a copy of the GNU Lesser General Public
-  License along with this library; if not, write to the Free Software
-  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
-*/
-
-void system_init(void)
-{
-  /* Configure flash wait states */
-  NVMCTRL->CTRLB.bit.RWS = FLASH_WAIT_STATES;
-
-  /* Set OSC8M prescalar to divide by 1 */
-  SYSCTRL->OSC8M.bit.PRESC = 0;
-
-  /* Configure OSC8M as source for GCLK_GEN0 */
-  GCLK_GENCTRL_Type genctrl={0};
-  uint32_t temp_genctrl;
-  GCLK->GENCTRL.bit.ID = 0; /* GENERATOR_ID - GCLK_GEN_0 */
-  while(GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY);
-  temp_genctrl = GCLK->GENCTRL.reg;
-  genctrl.bit.SRC = GCLK_GENCTRL_SRC_OSC8M_Val;
-  genctrl.bit.GENEN = true;
-  genctrl.bit.RUNSTDBY = false;
-  GCLK->GENCTRL.reg = (genctrl.reg | temp_genctrl);
-  while(GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY);
-
-#if SAM_BA_INTERFACE == SAM_BA_USBCDC_ONLY  ||  SAM_BA_INTERFACE == SAM_BA_BOTH_INTERFACES
-  SYSCTRL_DFLLCTRL_Type dfllctrl_conf = {0};
-  SYSCTRL_DFLLVAL_Type dfllval_conf = {0};
-  uint32_t coarse =( *((uint32_t *)(NVMCTRL_OTP4)
-                    + (NVM_SW_CALIB_DFLL48M_COARSE_VAL / 32))
-                    >> (NVM_SW_CALIB_DFLL48M_COARSE_VAL % 32))
-                    & ((1 << 6) - 1);
-  if (coarse == 0x3f) {
-    coarse = 0x1f;
-  }
-  uint32_t fine =( *((uint32_t *)(NVMCTRL_OTP4)
-                  + (NVM_SW_CALIB_DFLL48M_FINE_VAL / 32))
-                  >> (NVM_SW_CALIB_DFLL48M_FINE_VAL % 32))
-                  & ((1 << 10) - 1);
-  if (fine == 0x3ff) {
-    fine = 0x1ff;
-  }
-  dfllval_conf.bit.COARSE  = coarse;
-  dfllval_conf.bit.FINE    = fine;
-  dfllctrl_conf.bit.USBCRM = true;
-  dfllctrl_conf.bit.BPLCKC = false;
-  dfllctrl_conf.bit.QLDIS  = false;
-  dfllctrl_conf.bit.CCDIS  = true;
-  dfllctrl_conf.bit.ENABLE = true;
-
-  SYSCTRL->DFLLCTRL.bit.ONDEMAND = false;
-  while (!(SYSCTRL->PCLKSR.reg & SYSCTRL_PCLKSR_DFLLRDY));
-  SYSCTRL->DFLLMUL.reg = 48000;
-  SYSCTRL->DFLLVAL.reg = dfllval_conf.reg;
-  SYSCTRL->DFLLCTRL.reg = dfllctrl_conf.reg;
-
-  GCLK_CLKCTRL_Type clkctrl={0};
-  uint16_t temp;
-  GCLK->CLKCTRL.bit.ID = 0; /* GCLK_ID - DFLL48M Reference */
-  temp = GCLK->CLKCTRL.reg;
-  clkctrl.bit.CLKEN = true;
-  clkctrl.bit.WRTLOCK = false;
-  clkctrl.bit.GEN = GCLK_CLKCTRL_GEN_GCLK0_Val;
-  GCLK->CLKCTRL.reg = (clkctrl.reg | temp);
-
-  /* Configure DFLL48M as source for GCLK_GEN1 */
-  GCLK->GENCTRL.bit.ID = 1; /* GENERATOR_ID - GCLK_GEN_1 */
-  while(GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY);
-  temp_genctrl = GCLK->GENCTRL.reg;
-  genctrl.bit.SRC = GCLK_GENCTRL_SRC_DFLL48M_Val;
-  genctrl.bit.GENEN = true;
-  genctrl.bit.RUNSTDBY = false;
-  GCLK->GENCTRL.reg = (genctrl.reg | temp_genctrl);
-  while(GCLK->STATUS.reg & GCLK_STATUS_SYNCBUSY);
-#endif
-}