U-Boot配置MCU加载FPGA：MCBSP与AIS格式应用

1、修改交叉编译工具：u-boot\arch\arm\config.mk文件中将#CROSS_COMPILE ?= arm-linux- 改为CROSS_COMPILE ?= arm-arago-linux-gnueabi-
2、添加uart0作为boot串口：在文件u-boot\board\davinci\da8xxevm\omapl138_lcdk.c添加/*UART0 pin muxer settings*/
static const struct pinmux_config uart0_pins[] = {
{ pinmux(3), 2, 6 },
{ pinmux(3), 2, 7 },
{ pinmux(3), 2, 4 },
{ pinmux(3), 2, 5 }
};

在pinmux_resource结构中添加PINMUX_ITEM(uart0_pins),
在lpsc_resource结构中添加{ DAVINCI_LPSC_UART0 }, /* console */
int board_init(void)函数中writel(readl(&davinci_syscfg_regs->suspsrc) &
       ~(DAVINCI_SYSCFG_SUSPSRC_I2C |
 DAVINCI_SYSCFG_SUSPSRC_SPI1 | DAVINCI_SYSCFG_SUSPSRC_TIMER0 |
 DAVINCI_SYSCFG_SUSPSRC_UART0|DAVINCI_SYSCFG_SUSPSRC_MCBSP1),
       &davinci_syscfg_regs->suspsrc);
        和writel((DAVINCI_UART_PWREMU_MGMT_FREE | DAVINCI_UART_PWREMU_MGMT_URRST |
DAVINCI_UART_PWREMU_MGMT_UTRST),
       &davinci_uart0_ctrl_regs->pwremu_mgmt);
在u-boot\include\configs\omapl138_lcdk.h文件中  #define CONFIG_SYS_NS16550_COM1 DAVINCI_UART0_BASE /* Base address of UART2 */     

3、修改u-boot的时钟源：u-boot\include\configs\omapl138_lcdk.h文件中修改#define CONFIG_SYS_OSCIN_FREQ 20000000
4、修改环境变量的默认参数与命令行提示符：在u-boot\include\configs\omapl138_lcdk.h文件中修改#define CONFIG_SYS_PROMPT "PZ > " /* Command Prompt */
                #define CONFIG_BOOTCOMMAND "nand read 0xc0300000 0x500000 0x700000;nand read 0xc0a00000 0x300000 0x200000;bootm 0xc0a00000"
5、修改nandflash相关参数：在u-boot\drivers\mtd\nand\davinci_nand.c文件中修改#ifdef CONFIG_SYS_NAND_HW_ECC
nand->ecc.mode = NAND_ECC_HW;
nand->ecc.size = 2048;
nand->ecc.bytes = 16;
和
#if 1

.eccpos = {
24, 25, 26, 27, 28,
29, 30, 31, 32, 33, 34, 35, 36, 37, 38,
39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
49, 50, 51, 52, 53, 54, 55, 56, 57, 58,
59, 60, 61, 62, 63,
},
.oobfree = {
{.offset = 2, .length = 22, },
},
在文件u-boot\board\davinci\da8xxevm\omapl138_lcdk.c中修改writel((DAVINCI_ABCR_WSETUP(3) |
DAVINCI_ABCR_WSTROBE(15) |
DAVINCI_ABCR_WHOLD(1) |
DAVINCI_ABCR_RSETUP(3) |
DAVINCI_ABCR_RSTROBE(15) |
DAVINCI_ABCR_RHOLD(1) |
DAVINCI_ABCR_TA(1) |
DAVINCI_ABCR_ASIZE_16BIT),
       &davinci_emif_regs->ab2cr); /* CS3 */读写时序。
6、加载自定义的app的bin文件。在u-boot\common\cmd_bootm.c文件中重写函数
    #ifdef CONFIG_ARM_APP
int do_bootm (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{

ulong       iflag;
ulong  app_addr;
ulong       load_end = 0;
int     ret;
unsigned int *data;
uint32_t *fpga_data;