mbr/mbr.c

   1 /*
   2     e07 bootloader suite
   3     Copyright (c) 2008 Daniel Mack <daniel@caiaq.de>
   4     Copyright (c) 2009 Christopher Hall <hsw@openmoko.com>
   5
   6     This program is free software: you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation, either version 3 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "regs.h"
  21 #include "types.h"
  22 #include "wikireader.h"
  23 #include "eeprom.h"
  24
  25 #define APPLICATION_TITLE "mbr"
  26 #include "application.h"
  27
  28
  29 #define RAM_SIZE           8192
  30 #define RAM_LOAD_ADDRESS   0x200
  31 #define EEPROM_CODE_OFFSET 0x300
  32
  33 #define EEPROM_PAYLOAD_SIZE (RAM_SIZE - EEPROM_CODE_OFFSET)
  34
  35 #define DEST ((u8 *)RAM_LOAD_ADDRESS)
  36 #define APPLICATION ((application *)RAM_LOAD_ADDRESS)
  37
  38 #define PRINT_CHAR(c)                                           \
  39         do {                                                    \
  40                 do {                                            \
  41                 } while (0 == (REG_EFSIF0_STATUS & TDBEx));     \
  42                 REG_EFSIF0_TXD = c;                             \
  43         } while (0)
  44
  45
  46 // this defines the entry points to the MBR code
  47 //__attribute__ ((noreturn))
  48 void start(void)
  49 {
  50         asm volatile (
  51                 "\tjp\tmaster_boot\n"   // location 0 - boot
  52                 "\t.extern\teeprom_load\n"
  53                 "\txjp\teeprom_load\n"  // location 2 - so eeprom_load can be re-used
  54                 );
  55 }
  56
  57
  58 __attribute__ ((noreturn))
  59 void master_boot(void)
  60 {
  61         asm volatile ("xld.w   %r15, __dp");
  62         {
  63                 register ReturnType rc = { 0, 0xffffffff };
  64
  65                 for (;;) {
  66                         asm volatile ("xld.w   %r15, __dp");
  67                         init_pins();
  68                         init_rs232_ch0();
  69                         //init_ram(); // but will be too big
  70
  71                         // enable SPI: master mode, no DMA, 8 bit transfers
  72                         REG_SPI_CTL1 = 0x03 | (7 << 10);
  73
  74                         //PRINT_CHAR('>');
  75                         PRINT_CHAR('\r');
  76                         PRINT_CHAR('\n');
  77                         eeprom_load((rc.block << 13) | EEPROM_CODE_OFFSET, DEST, EEPROM_PAYLOAD_SIZE);
  78
  79                         rc = (APPLICATION)(rc.block, rc.status);
  80                         //PRINT_CHAR('<');
  81                 }
  82         }
  83 }