启动uboot的时候总是出现
*** Warning - bad CRC, using default environment
不知到怎么回事，检查一下于那代码看看
236 void start_armboot (void)
237 {
238 init_fnc_t **init_fnc_ptr;
239 char *s;
240 #ifndef CFG_NO_FLASH
241 ulong size;
242 #endif
243 #if defined(CONFIG_VFD) || defined(CONFIG_LCD)
244 unsigned long addr;
245 #endif
246
247 /* Pointer is writable since we allocated a register for it */
248 gd = (gd_t*)(_armboot_start - CFG_MALLOC_LEN - sizeof(gd_t));
249 /* compiler optimization barrier needed for GCC >= 3.4 */
250 __asm__ __volatile__("": : :"memory");
251
252 memset ((void*)gd, 0, sizeof (gd_t));
253 gd->bd = (bd_t*)((char*)gd - sizeof(bd_t));
254 memset (gd->bd, 0, sizeof (bd_t));
255
256 monitor_flash_len = _bss_start - _armboot_start;
257
258 for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
259 if ((*init_fnc_ptr)() != 0) {
260 hang ();
261 }
262 }
263
264 #ifndef CFG_NO_FLASH
265 /* configure available FLASH banks */
266 size = flash_init ();
267 display_flash_config (size);
268 #endif /* CFG_NO_FLASH */
269
270 #ifdef CONFIG_VFD
271 # ifndef PAGE_SIZE
272 # define PAGE_SIZE 4096
273 # endif
274 /*
275 * reserve memory for VFD display (always full pages)
276 */
277 /* bss_end is defined in the board-specific linker script */
278 addr = (_bss_end + (PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1);
279 size = vfd_setmem (addr);
280 gd->fb_base = addr;
281 #endif /* CONFIG_VFD */
282
283 #ifdef CONFIG_LCD
284 # ifndef PAGE_SIZE
285 # define PAGE_SIZE 4096
286 # endif
287 /*
288 * reserve memory for LCD display (always full pages)
289 */
290 /* bss_end is defined in the board-specific linker script */
291 addr = (_bss_end + (PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1);
292 size = lcd_setmem (addr);
293 gd->fb_base = addr;
294 #endif /* CONFIG_LCD */
295
296 /* armboot_start is defined in the board-specific linker script */
297 mem_malloc_init (_armboot_start - CFG_MALLOC_LEN);
298
299 #if (CONFIG_COMMANDS & CFG_CMD_NAND)
300 puts ("NAND: ");
301 nand_init(); /* go init the NAND */
302 #endif
303
304 #ifdef CONFIG_HAS_DATAFLASH
305 AT91F_DataflashInit();
306 dataflash_print_info();
307 #endif
308
309 /* initialize environment */
310 env_relocate ();
311
312 #ifdef CONFIG_VFD
313 /* must do this after the framebuffer is allocated */
314 drv_vfd_init();
315 #endif /* CONFIG_VFD */
316
317 /* IP Address */
318 gd->bd->bi_ip_addr = getenv_IPaddr ("ipaddr");
319
320 /* MAC Address */
321 {
322 int i;
323 ulong reg;
324 char *s, *e;
325 char tmp[64];
326
327 i = getenv_r ("ethaddr", tmp, sizeof (tmp));
328 s = (i > 0) ? tmp : NULL;
329
330 for (reg = 0; reg < 6; ++reg) {
331 gd->bd->bi_enetaddr[reg] = s ? simple_strtoul (s, &e, 16) : 0;
332 if (s)
333 s = (*e) ? e + 1 : e;
334 }
335
336 #ifdef CONFIG_HAS_ETH1
337 i = getenv_r ("eth1addr", tmp, sizeof (tmp));
338 s = (i > 0) ? tmp : NULL;
339
340 for (reg = 0; reg < 6; ++reg) {
341 gd->bd->bi_enet1addr[reg] = s ? simple_strtoul (s, &e, 16) : 0;
342 if (s)
343 s = (*e) ? e + 1 : e;
344 }
345 #endif
346 }
347
348 devices_init (); /* get the devices list going. */
349
350 #ifdef CONFIG_CMC_PU2
351 load_sernum_ethaddr ();
352 #endif /* CONFIG_CMC_PU2 */
353
354 jumptable_init ();
355
356 console_init_r (); /* fully init console as a device */
357
358 #if defined(CONFIG_MISC_INIT_R)
359 /* miscellaneous platform dependent initialisations */
360 misc_init_r ();
361 #endif
362
363 /* enable exceptions */
364 enable_interrupts ();
366 /* Perform network card initialisation if necessary */
367 #ifdef CONFIG_DRIVER_CS8900
368 cs8900_get_enetaddr (gd->bd->bi_enetaddr);
369 #endif
370
371 #if defined(CONFIG_DRIVER_SMC91111) || defined (CONFIG_DRIVER_LAN91C96)
372 if (getenv ("ethaddr")) {
373 smc_set_mac_addr(gd->bd->bi_enetaddr);
374 }
375 #endif /* CONFIG_DRIVER_SMC91111 || CONFIG_DRIVER_LAN91C96 */
376
377 /* Initialize from environment */
378 if ((s = getenv ("loadaddr")) != NULL) {
379 load_addr = simple_strtoul (s, NULL, 16);
380 }
381 #if (CONFIG_COMMANDS & CFG_CMD_NET)
382 if ((s = getenv ("bootfile")) != NULL) {
383 copy_filename (BootFile, s, sizeof (BootFile));
384 }
385 #endif /* CFG_CMD_NET */
386
387 #ifdef BOARD_LATE_INIT
388 board_late_init ();
389 #endif
390 #if (CONFIG_COMMANDS & CFG_CMD_NET)
391 #if defined(CONFIG_NET_MULTI)
392 puts ("Net: ");
393 #endif
394 eth_initialize(gd->bd);
395 #endif
396 /* main_loop() can return to retry autoboot, if so just run it again. */
397 for (;;) {
398 main_loop ();
399 }
400
401 /* NOTREACHED - no way out of command loop except booting */
402 }
其中
258 for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
259 if ((*init_fnc_ptr)() != 0) {
260 hang ();
261 }
262 }
用来初始化
init_fnc_t *init_sequence[] = {
217 cpu_init, /* basic cpu dependent setup */
218 board_init, /* basic board dependent setup */
219 interrupt_init, /* set up exceptions */
220 env_init, /* initialize environment */
221 init_baudrate, /* initialze baudrate settings */
222 serial_init, /* serial communications setup */
223 console_init_f, /* stage 1 init of console */
224 display_banner, /* say that we are here */
225 #if defined(CONFIG_DISPLAY_CPUINFO)
226 print_cpuinfo, /* display cpu info (and speed) */
227 #endif
228 #if defined(CONFIG_DISPLAY_BOARDINFO)
229 checkboard, /* display board info */
230 #endif
231 dram_init, /* configure available RAM banks */
232 display_dram_config,
233 NULL,
234 };
env_init()用来初始华环境变量
102 int env_init(void)
103 { 如果环境变量是嵌入到目标代码中的时候
104 #if defined(ENV_IS_EMBEDDED)
105 ulong total;
106 int crc1_ok = 0, crc2_ok = 0;
107 env_t *tmp_env1, *tmp_env2;
108
109 total = CFG_ENV_SIZE;
110
111 tmp_env1 = env_ptr;
112 tmp_env2 = (env_t *)((ulong)env_ptr + CFG_ENV_SIZE);
113
114 crc1_ok = (crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc);
115 crc2_ok = (crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc);
116
117 if (!crc1_ok && !crc2_ok)
118 gd->env_valid = 0;
119 else if(crc1_ok && !crc2_ok)
120 gd->env_valid = 1;
121 else if(!crc1_ok && crc2_ok)
122 gd->env_valid = 2;
123 else {
124 /* both ok - check serial */
125 if(tmp_env1->flags == 255 && tmp_env2->flags == 0)
126 gd->env_valid = 2;
127 else if(tmp_env2->flags == 255 && tmp_env1->flags == 0)
128 gd->env_valid = 1;
129 else if(tmp_env1->flags > tmp_env2->flags)
130 gd->env_valid = 1;
131 else if(tmp_env2->flags > tmp_env1->flags)
132 gd->env_valid = 2;
133 else /* flags are equal - almost impossible */
134 gd->env_valid = 1;
135 }
136
137 if (gd->env_valid == 1)
138 env_ptr = tmp_env1;
139 else if (gd->env_valid == 2)
140 env_ptr = tmp_env2;
141 #else /* ENV_IS_EMBEDDED */
142 gd->env_addr = (ulong)&default_environment[0];
143 gd->env_valid = 1;
144 #endif /* ENV_IS_EMBEDDED */
145
146 return (0);
147 }
其中
／／8＊＊＊ extern uchar environment[]
／／＊＊＊＊＊＊ env_t *env_ptr = (env_t *)(&environment[0]);
追踪过去
／＊＊＊＊＊＊ struct partition_block
97 struct partition_block
98 {
99 u32 id;
100 u32 summed_longs;
101 s32 chk_sum;
102 u32 host_id;
103 u32 next;
104 u32 flags;
105 u32 reserved_1[2];
106 u32 dev_flags;
107 char drive_name[32];
108 u32 reserved_2[15];
109 u32 environment[17];
110 u32 reserved_3[15];
111 };
environment 是在上上面的函数定义的
如果初始化成功则 gd->env_valid = 1;
则后面不会出现 *** Warning - bad CRC, using default environment 可是我到现在还没找到初始化他的程序。
env_relocate (); 设置环境变量
194 void env_relocate (void)
195 {
196 DEBUGF ("%s[%d] offset = 0x%lx\n", __FUNCTION__,__LINE__,
197 gd->reloc_off);
198
199 #ifdef CONFIG_AMIGAONEG3SE
200 enable_nvram();
201 #endif
202
203 #ifdef ENV_IS_EMBEDDED
204 /*
205 * The environment buffer is embedded with the text segment,
206 * just relocate the environment pointer
207 */
208 env_ptr = (env_t *)((ulong)env_ptr + gd->reloc_off);
209 DEBUGF ("%s[%d] embedded ENV at %p\n", __FUNCTION__,__LINE__,env_ptr);
210 #else
211 /*
212 * We must allocate a buffer for the environment
213 */
214 env_ptr = (env_t *)malloc (CFG_ENV_SIZE);
215 DEBUGF ("%s[%d] malloced ENV at %p\n", __FUNCTION__,__LINE__,env_ptr);
216 #endif
217
218 /*
219 * After relocation to RAM, we can always use the "memory" functions
220 */
221 env_get_char = env_get_char_memory;
222
223 if (gd->env_valid == 0) {
224 #if defined(CONFIG_GTH) || defined(CFG_ENV_IS_NOWHERE) /* Environment not changable */
225 puts ("Using default environment\n\n");
226 #else
227 puts ("*** Warning - bad CRC, using default environment\n\n");
228 show_boot_progress (-60);
229 #endif
230
231 if (sizeof(default_environment) > ENV_SIZE)
232 {
233 puts ("*** Error - default environment is too large\n\n");
234 return;
235 }
236
237 memset (env_ptr, 0, sizeof(env_t));
238 memcpy (env_ptr->data,
239 default_environment,
240 sizeof(default_environment));
241 #ifdef CFG_REDUNDAND_ENVIRONMENT
242 env_ptr->flags = 0xFF;
243 #endif
244 env_crc_update ();
245 gd->env_valid = 1;
246 }
247 else {
248 env_relocate_spec ();
249 }
250 gd->env_addr = (ulong)&(env_ptr->data);
251
252 #ifdef CONFIG_AMIGAONEG3SE
2 #ifdef CONFIG_AMIGAONEG3SE
253 disable_nvram();
254 #endif
255 }
该程序的主要作用是将环境变量从 flash 转移到ram 中 来 并 gd->env_addr = (ulong)&(env_ptr->data); 赋值
暂时 分析到这里 ，有哪位 对这个问题 有独到的看法 ，请不吝赐教！
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