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annotate packages/redboot/current/src/flash_load.c @ 2863:7d8c61e6225c default tip

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* Added execute permissions to files missed in conversion from CVS
author alexs
date Thu, 26 Mar 2009 20:39:18 +0000
parents 74dbf4c3f2e1
children
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1 //==========================================================================
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2 //
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3 // flash_load.c
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4 //
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5 // RedBoot file/image loader into flash
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6 //
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7 //==========================================================================
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8 // ####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 2006 Free Software Foundation, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later
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16 // version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT
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19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 // for more details.
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22 //
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23 // You should have received a copy of the GNU General Public License
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24 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use
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28 // macros or inline functions from this file, or you compile this file
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29 // and link it with other works to produce a work based on this file,
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30 // this file does not by itself cause the resulting work to be covered by
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31 // the GNU General Public License. However the source code for this file
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32 // must still be made available in accordance with section (3) of the GNU
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33 // General Public License v2.
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34 //
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35 // This exception does not invalidate any other reasons why a work based
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36 // on this file might be covered by the GNU General Public License.
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37 // -------------------------------------------
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38 // ####ECOSGPLCOPYRIGHTEND####
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39 //==========================================================================
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40 //#####DESCRIPTIONBEGIN####
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41 //
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42 // Author(s): Oliver Munz
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43 // Contributors: om, asl
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44 // Date: 2006-02-21
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45 // Purpose:
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46 // Description:
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47 //
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48 // This code is part of RedBoot (tm).
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49 //
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50 //####DESCRIPTIONEND####
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51 //
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52 //==========================================================================
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53
36bfd6474600 * src/xyzModem.c (xyzModem_stream_open): Fix compiler warnings.
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54 #include <redboot.h>
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55 #include <flash_load.h>
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56
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57 #include <cyg/io/flash.h>
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58 #include <cyg/infra/cyg_ass.h>
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59
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60 static int flash_block_size;
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61
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62 static cyg_uint8 * current_flash_page;
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63
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64 /* Allocation of the flash-sector size RAM-buffer is done */
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65 static bool init_done = false;
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66
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67 /* We have initialized the current page ready for writing */
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68 static bool flash_page_init = false;
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69
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70 static cyg_uint8 *flash_buffer;
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71
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72 // If the io flash code outputs when erasing/writing it will upset the
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73 // download over the communications channel. So we install a dummy
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74 // print function.
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75 static int dummy_printf(const char *fmt, ...){
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76 return 0;
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77 }
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78
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79 // Calculate the address of the first byte in a flash block
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80 static cyg_uint8 * flash_block_begin(cyg_uint32 addr)
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81 {
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82 return (cyg_uint8 *)
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83 ((addr / flash_block_size) * flash_block_size);
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84 }
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85
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86 // Initialize the loading process
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87 void flash_load_start(void)
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88 {
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89 flash_init(dummy_printf);
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90
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91 init_done = true;
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92 flash_page_init = false;
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93 }
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94
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95 // Write a byte into flash. We maintain a copy in RAM of the FLASH
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96 // page we are currently "writing" into. This copy is loaded with the
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97 // current contents of the FLASH page when the first byte is "written"
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98 // to the page. The "writes" are then made into the RAM copy. We only
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99 // write to FLASH when there is a "write" outside of the current page,
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100 // or the flash_load_finish function is called.
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101 void flash_load_write(cyg_uint8 *flash_addr, cyg_uint8 value)
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102 {
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103
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104 cyg_uint32 retcode = FLASH_ERR_OK;
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105 void * err_addr;
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106 cyg_uint32 addr = (cyg_uint32)flash_addr;
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107 cyg_uint32 offset;
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108
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109 if (!flash_page_init) {
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110 /* First Byte for the current flash block. Read the current contents */
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111 current_flash_page = flash_block_begin(addr);
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112 flash_read(flash_buffer, current_flash_page, flash_block_size, &err_addr);
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113 flash_page_init = true;
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114 }
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115 if (flash_block_begin(addr) != current_flash_page) {
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116 /* We have moved into the next flash page. Write the current
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117 page so we can move on */
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118 retcode = flash_erase(current_flash_page, flash_block_size, &err_addr);
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119 if (retcode != FLASH_ERR_OK){ /* Flash ERROR */
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120 diag_printf("Error erase at %p: %s\n", err_addr, flash_errmsg(retcode));
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121 return;
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122 }
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123
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124 retcode = flash_program(current_flash_page, flash_buffer,
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125 flash_block_size, &err_addr);
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126 if (retcode != FLASH_ERR_OK){
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127 diag_printf("Error writing at %p: %s\n",
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128 err_addr, flash_errmsg(retcode));
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129 return;
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130 }
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131 current_flash_page = flash_block_begin(addr);
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132 flash_read(flash_buffer, current_flash_page, flash_block_size, &err_addr);
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133 }
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134
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135 offset = flash_addr - current_flash_page;
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136 CYG_ASSERT(offset < flash_block_size, "offset not inside flash block");
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137
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138 flash_buffer[offset] = value;
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139 }
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140
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141 // Program the current page into flash.
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142 void flash_load_finish(void)
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143 {
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144 cyg_uint32 retcode = FLASH_ERR_OK;
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145 void * err_addr;
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146
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147 if (init_done && flash_page_init) {
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148 flash_page_init = false;
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149
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150 retcode = flash_erase(current_flash_page, flash_block_size, &err_addr);
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151 if (retcode != FLASH_ERR_OK){
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152 diag_printf("Error erase at %p: %s\n", err_addr, flash_errmsg(retcode));
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153 } else {
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154 retcode = flash_program(current_flash_page, flash_buffer,
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155 flash_block_size, &err_addr);
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156 if (retcode != FLASH_ERR_OK){
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157 diag_printf("Error writing at %p: %s\n",
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158 err_addr, flash_errmsg(retcode));
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159 }
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160 }
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161 }
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162 flash_init(diag_printf);
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163 }
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164
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165 // This is called during redboot start up. We allocate a buffer the
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166 // size of the flash page.
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167 void
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168 flash_load_init(void)
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169 {
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170 int flash_blocks;
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171
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172 flash_get_block_info(&flash_block_size, &flash_blocks);
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173 workspace_end -= flash_block_size;
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174
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175 flash_buffer = workspace_end;
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176 }
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177
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178 // Register this initialization function in the table
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179 RedBoot_init(flash_load_init, RedBoot_INIT_LAST);
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180
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181
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182