uboot_mt7620對SPI flash操作的分析

mrjbydd 2014-01-13

展開全文

接上篇文章，AR9331系統(tǒng)與mt7620系統(tǒng)對flash的劃分是不一樣的，AR系統(tǒng)劃分為Flash（可能是作為NAND來處理），而mt7620（mips）系統(tǒng)則劃分的比較明確，用的是SPI_FLASH。

在uboot的啟動(dòng)界面上，可以看到這樣一些信息：

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Please choose the operation:
1: Load system code to SDRAM via TFTP.
2: Load system code then write to Flash via TFTP.
3: Boot system code via Flash (default).
4: Entr boot command line interface.
7: Load Boot Loader code then write to Flash via Serial.
9: Load Boot Loader code then write to Flash via TFTP.

于是，

[plain] view plain copy print ?

grep 'write to Flash via TFTP' -r .

找到：

[cpp] view plain copy print ?

./lib_mips/board.c: printf(" %d: Load system code then write to Flash via TFTP. \n", SEL_LOAD_LINUX_WRITE_FLASH);
./lib_mips/board.c: printf(" %d: Load Boot Loader code then write to Flash via TFTP. \n", SEL_LOAD_BOOT_WRITE_FLASH);
./lib_mips/board.c: printf(" \n%d: System Load Linux Kernel then write to Flash via TFTP. \n", SEL_LOAD_LINUX_WRITE_FLASH);
./lib_mips/board.c: printf(" \n%d: System Load Boot Loader then write to Flash via TFTP. (.bin)\n", SEL_LOAD_BOOT_WRITE_FLASH);

打開board.c一看究竟。

[cpp] view plain copy print ?

void OperationSelect(void)
{
printf("\nPlease choose the operation: \n");
printf(" %d: Load system code then write to Flash via Serial. \n", SEL_LOAD_LINUX_WRITE_FLASH_BY_SERIAL);
printf(" %d: Load system code to SDRAM via TFTP. \n", SEL_LOAD_LINUX_SDRAM);
printf(" %d: Load system code then write to Flash via TFTP. \n", SEL_LOAD_LINUX_WRITE_FLASH);
printf(" %d: Boot system code via Flash (default).\n", SEL_BOOT_FLASH);
#ifdef RALINK_CMDLINE
printf(" %d: Entr boot command line interface.\n", SEL_ENTER_CLI);
#endif // RALINK_CMDLINE //
#if defined(ASUS_RTN14U)
printf(" %d: Load Boot Loader code to SDRAM via Serial. \n", SEL_LOAD_BOOT_SDRAM_VIA_SERIAL);
#endif
#ifdef RALINK_UPGRADE_BY_SERIAL
printf(" %d: Load Boot Loader code then write to Flash via Serial. \n", SEL_LOAD_BOOT_WRITE_FLASH_BY_SERIAL);
#endif // RALINK_UPGRADE_BY_SERIAL //
#if defined(ASUS_RTN14U)
printf(" %d: Load Boot Loader code to SDRAM via TFTP. \n", SEL_LOAD_BOOT_SDRAM);
#endif
printf(" %d: Load Boot Loader code then write to Flash via TFTP. \n", SEL_LOAD_BOOT_WRITE_FLASH);
}

調(diào)用層次為：【./cpu/ralink_soc/start.S: la t9, board_init_r】→【board_init_r】→【OperationSelect】

[cpp] view plain copy print ?

case '2':
printf(" \n%d: System Load Linux Kernel then write to Flash via TFTP. \n", SEL_LOAD_LINUX_WRITE_FLASH);
printf(" Warning!! Erase Linux in Flash then burn new one. Are you sure?(Y/N)\n");
confirm = getc();
if (confirm != 'y' && confirm != 'Y') {
printf(" Operation terminated\n");
break;
}
tftp_config(SEL_LOAD_LINUX_WRITE_FLASH, argv);
argc= 3;
setenv("autostart", "no");
do_tftpb(cmdtp, 0, argc, argv);
#if defined (CFG_ENV_IS_IN_NAND)
if (1) {
unsigned int load_address = simple_strtoul(argv[1], NULL, 16);
ranand_erase_write((u8 *)load_address, CFG_KERN_ADDR-CFG_FLASH_BASE, NetBootFileXferSize);
}
#elif defined (CFG_ENV_IS_IN_SPI)
if (1) {
unsigned int load_address = simple_strtoul(argv[1], NULL, 16);
raspi_erase_write((u8 *)load_address, CFG_KERN_ADDR-CFG_FLASH_BASE, NetBootFileXferSize);
}
#else //CFG_ENV_IS_IN_FLASH
#if (defined (ON_BOARD_8M_FLASH_COMPONENT) || defined (ON_BOARD_16M_FLASH_COMPONENT)) && (defined (RT2880_ASIC_BOARD) || defined (RT2880_FPGA_BOARD) || defined (RT3052_MP1))
//erase linux
if (NetBootFileXferSize <= (0x400000 - (CFG_BOOTLOADER_SIZE + CFG_CONFIG_SIZE + CFG_FACTORY_SIZE))) {
e_end = CFG_KERN_ADDR + NetBootFileXferSize;
if (0 != get_addr_boundary(&e_end))
break;
printf("Erase linux kernel block !!\n");
printf("From 0x%X To 0x%X\n", CFG_KERN_ADDR, e_end);
flash_sect_erase(CFG_KERN_ADDR, e_end);
}
else if (NetBootFileXferSize <= CFG_KERN_SIZE) {
e_end = PHYS_FLASH_2 + NetBootFileXferSize - (0x400000 - (CFG_BOOTLOADER_SIZE + CFG_CONFIG_SIZE + CFG_FACTORY_SIZE));
if (0 != get_addr_boundary(&e_end))
break;
printf("Erase linux kernel block !!\n");
printf("From 0x%X To 0x%X\n", CFG_KERN_ADDR, CFG_FLASH_BASE+0x3FFFFF);
flash_sect_erase(CFG_KERN_ADDR, CFG_FLASH_BASE+0x3FFFFF);
printf("Erase linux file system block !!\n");
printf("From 0x%X To 0x%X\n", PHYS_FLASH_2, e_end);
flash_sect_erase(PHYS_FLASH_2, e_end);
}
#else
if (NetBootFileXferSize <= (bd->bi_flashsize - (CFG_BOOTLOADER_SIZE + CFG_CONFIG_SIZE + CFG_FACTORY_SIZE))) {
e_end = CFG_KERN_ADDR + NetBootFileXferSize;
if (0 != get_addr_boundary(&e_end))
break;
printf("Erase linux kernel block !!\n");
printf("From 0x%X To 0x%X\n", CFG_KERN_ADDR, e_end);
flash_sect_erase(CFG_KERN_ADDR, e_end);
}
#endif
else {
printf("***********************************\n");
printf("The Linux Image size is too big !! \n");
printf("***********************************\n");
break;
}
//cp.linux
argc = 4;
argv[0]= "cp.linux";
do_mem_cp(cmdtp, 0, argc, argv);
#endif //CFG_ENV_IS_IN_FLASH
#ifdef DUAL_IMAGE_SUPPORT
/* Don't do anything to the firmware upgraded in Uboot, since it may be used for testing */
setenv("Image1Stable", "1");
saveenv();
#endif
//bootm bc050000
argc= 2;
sprintf(addr_str, "0x%X", CFG_KERN_ADDR);
argv[1] = &addr_str[0];
do_bootm(cmdtp, 0, argc, argv);
break;

調(diào)用的是 raspi_erase_write 方法來對spi flash進(jìn)行擦除和寫入。

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來自： mrjbydd > 《arm》

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