am335x BOOT_DEVICE不正确的原因

xiaoxia jiang

两块板子，BOOT_DEVICE 都是不正确的，一块的rom_params是0x4030CFD8,对应的BOOT_DEVICE是0x58,另外一块rom_params是0x40301ecc,对应的BOOT_DEVICE是0xb2,这是参数都不对，是什么原因导致的？

9 年多前

0 Steven Liu1 9 年多前

TI__Mastermind 25020 points

跟下代码，BOOT_DEVICE这个值是怎么得到的呢？是通过control module的sysboot值得到的吗？

你说的两个都不对，那么正确的应该是啥，应该会有个switch分支来辨识走哪个启动方式吧？

如果这里走错了，是读进来的boot_device值就错了，还是在某个逻辑判断的地方就错了？

0 xiaoxia jiang 9 年多前回复 Steven Liu1

Prodigy 190 points

1.boot_device是由boot-common.c里的rom_params确定的

void save_omap_boot_params(void)
{
   u32 rom_params = *((u32 *)OMAP_SRAM_SCRATCH_BOOT_PARAMS);
   u8 boot_device;
   u32 dev_desc, dev_data;

   if ((rom_params < NON_SECURE_SRAM_START) ||
        (rom_params > NON_SECURE_SRAM_END))
       return;

gd->arch.omap_boot_params.omap_bootdevice = boot_device =
*((u8 *)(rom_params + BOOT_DEVICE_OFFSET));

~~~~~~~~

2.确实是有个SWITCH分支来辨别走哪个启动方式的，是读进来的值就是错的。

在spl.h中对BOOT_DEVICE的值进行了定义

#if defined(CONFIG_TI816X)
#define BOOT_DEVICE_XIP       2
#define BOOT_DEVICE_NAND   3
#define BOOT_DEVICE_MMC1   6
#define BOOT_DEVICE_MMC2   5
#define BOOT_DEVICE_UART   0x43
#elif defined(CONFIG_AM43XX)
#define BOOT_DEVICE_NOR       1
#define BOOT_DEVICE_NAND   5
#define BOOT_DEVICE_MMC1   7
#define BOOT_DEVICE_MMC2   8
#define BOOT_DEVICE_SPI       10
#define BOOT_DEVICE_USB     13
#define BOOT_DEVICE_UART   65
#define BOOT_DEVICE_USBETH   69
#define BOOT_DEVICE_CPGMAC   71
#else
#define BOOT_DEVICE_XIP          2
#define BOOT_DEVICE_NAND   5
#if defined(CONFIG_AM33XX)
#define BOOT_DEVICE_MMC1   8
#define BOOT_DEVICE_MMC2   9   /* eMMC or daughter card */
#elif defined(CONFIG_TI814X)
#define BOOT_DEVICE_MMC1   9
#define BOOT_DEVICE_MMC2   8   /* ROM only supports 2nd instance */
#endif
#define BOOT_DEVICE_SPI       11
#define BOOT_DEVICE_UART   65
#define BOOT_DEVICE_USBETH   68
#define BOOT_DEVICE_CPGMAC   70
#endif
#define BOOT_DEVICE_MMC2_2      0xFF

#if defined(CONFIG_AM33XX)
#define MMC_BOOT_DEVICES_START BOOT_DEVICE_MMC1
#define MMC_BOOT_DEVICES_END   BOOT_DEVICE_MMC2
#elif defined(CONFIG_AM43XX)
#define MMC_BOOT_DEVICES_START BOOT_DEVICE_MMC1
#ifdef CONFIG_SPL_USB_SUPPORT
#define MMC_BOOT_DEVICES_END   BOOT_DEVICE_USB
#else
#define MMC_BOOT_DEVICES_END   BOOT_DEVICE_MMC2
#endif
#elif defined(CONFIG_TI81XX)
#define MMC_BOOT_DEVICES_START   BOOT_DEVICE_MMC2
#define MMC_BOOT_DEVICES_END   BOOT_DEVICE_MMC1
#endif
#endif

switch函数在spl.c中

boot_device = spl_boot_device();
   debug("boot device - %d\n", boot_device);
   switch (boot_device) {
#ifdef CONFIG_SPL_RAM_DEVICE
   case BOOT_DEVICE_RAM:
       spl_ram_load_image();
       break;
#endif
#ifdef CONFIG_SPL_MMC_SUPPORT
   case BOOT_DEVICE_MMC1:
   case BOOT_DEVICE_MMC2:
   case BOOT_DEVICE_MMC2_2:
                puts("hello");
       spl_mmc_load_image();
       break;
#endif
#ifdef CONFIG_SPL_NAND_SUPPORT
   case BOOT_DEVICE_NAND:
       spl_nand_load_image();
       break;
#endif
#ifdef CONFIG_SPL_ONENAND_SUPPORT
   case BOOT_DEVICE_ONENAND:
       spl_onenand_load_image();
       break;
#endif
#ifdef CONFIG_SPL_NOR_SUPPORT
   case BOOT_DEVICE_NOR:
       spl_nor_load_image();
       break;
#endif
#ifdef CONFIG_SPL_YMODEM_SUPPORT
   case BOOT_DEVICE_UART:
       spl_ymodem_load_image();
       break;
#endif
#ifdef CONFIG_SPL_SPI_SUPPORT
   case BOOT_DEVICE_SPI:
       spl_spi_load_image();
       break;
#endif
#ifdef CONFIG_SPL_ETH_SUPPORT
   case BOOT_DEVICE_CPGMAC:
#ifdef CONFIG_SPL_ETH_DEVICE
       spl_net_load_image(CONFIG_SPL_ETH_DEVICE);
#else
       spl_net_load_image(NULL);
#endif
       break;
#endif
#ifdef CONFIG_SPL_USBETH_SUPPORT
   case BOOT_DEVICE_USBETH:
       spl_net_load_image("usb_ether");
       break;
#endif
#ifdef CONFIG_SPL_USB_SUPPORT
   case BOOT_DEVICE_USB:
       spl_usb_load_image();
       break;
#endif
#ifdef CONFIG_SPL_SATA_SUPPORT
   case BOOT_DEVICE_SATA:
       spl_sata_load_image();
       break;
#endif
   default:
       debug("SPL: Un-supported Boot Device\n");
                hang();
   }