实现了uboot对非linux kernel的引导。虽然有一个IH_TYPE_STANDALONE，但是没有实现。nnd.只能自己想办法。实现详细见下面。
1、两个命令
set bootcmd tftp 84000000 uImage\；bootm 84000000
set bootdelay 1
2、非linux kernel的引导实现方法：
一共三个函数： jump，selectboot 和 system_boot
把jump放在需要跳转的地方，参数就是要跳转的地址。然后返回，重启系统。select放在main的开头。通过判断ram的特定地址的特定信息实现跳转。
system_boot实现系统的重新启动
| #define FDMA_SRAM_TOP_ADDRESS 0xB9229800 #define MAGIC_NUM 0x71097100 #define DEAD_PATTERN 0xBAD0BADF #define ST40_CPG_REGS_BASE 0xFFC00000#define ST40_CPG_WTCNT (ST40_CPG_REGS_BASE + 0x08) #define ST40_CPG_WTCSR (ST40_CPG_REGS_BASE + 0x0C) #define ST40_CPG_WTCSR2 (ST40_CPG_REGS_BASE + 0x1C) void Jump(unsigned int address) { STSYS_WriteRegDev32LE(FDMA_SRAM_TOP_ADDRESS - 4*1, MAGIC_NUM); STSYS_WriteRegDev32LE(FDMA_SRAM_TOP_ADDRESS - 4*2, address); STSYS_WriteRegDev32LE(FDMA_SRAM_TOP_ADDRESS - 4*3, ~address); STSYS_WriteRegDev32LE(FDMA_SRAM_TOP_ADDRESS - 4*4, ~MAGIC_NUM); STSYS_WriteRegDev16LE(ST40_CPG_WTCNT, 0x5AF0); /*Watchdog counter*/ STSYS_WriteRegDev16LE(ST40_CPG_WTCSR, 0xA547); /*Watchdog control*/ STSYS_WriteRegDev16LE(ST40_CPG_WTCSR2, 0xAA00); /*Watchdog control2*/ STSYS_WriteRegDev16LE(ST40_CPG_WTCSR, 0xA5C7); /*Start watchdog counter*/ for(;;); } void SelectBoot(void) { unsigned int MagicNum = 0; unsigned int NotMagicNum = 0; unsigned int JumpAddress = 0; unsigned int NotJumpAddress = 0; void (*entry)(void); /* entry=0xa0100000; entry();*/ //if((STSYS_ReadRegDev16LE(ST40_CPG_WTCSR2) & 0xFF) != 0x0) { MagicNum = STSYS_ReadRegDev32LE(FDMA_SRAM_TOP_ADDRESS - 4*1); JumpAddress = STSYS_ReadRegDev32LE(FDMA_SRAM_TOP_ADDRESS - 4*2); NotJumpAddress = STSYS_ReadRegDev32LE(FDMA_SRAM_TOP_ADDRESS - 4*3); NotMagicNum = STSYS_ReadRegDev32LE(FDMA_SRAM_TOP_ADDRESS - 4*4); if((MagicNum == MAGIC_NUM) && (MagicNum == (~NotMagicNum)) && (JumpAddress == (~NotJumpAddress))) { entry = (void (*)(void))JumpAddress; STSYS_WriteRegDev32LE(FDMA_SRAM_TOP_ADDRESS - 4*1, DEAD_PATTERN); STSYS_WriteRegDev32LE(FDMA_SRAM_TOP_ADDRESS - 4*2, DEAD_PATTERN); STSYS_WriteRegDev32LE(FDMA_SRAM_TOP_ADDRESS - 4*3, DEAD_PATTERN); STSYS_WriteRegDev32LE(FDMA_SRAM_TOP_ADDRESS - 4*4, DEAD_PATTERN); #if 0/*Setup For watchdog in case jump failed.*/ STSYS_WriteRegDev16LE(ST40_CPG_WTCNT, 0x5AF0); STSYS_WriteRegDev16LE(ST40_CPG_WTCSR, 0xA543); STSYS_WriteRegDev16LE(ST40_CPG_WTCSR2, 0xAA01); STSYS_WriteRegDev16LE(ST40_CPG_WTCSR, 0xA5C7); #endif entry(); while(1); } } }void system_reboot(void) { ulong sr; asm ("stc sr, %0":"=r" (sr)); sr |= (1 <<28); /* set block bit */ asm ("ldc %0, sr": :"r" (sr)); asm volatile ("trapa #0"); } |
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