after relcate code and jump into board_init_r()

1.if i use printf to output string, it never put, but serial_puts is ok, and printf in board_init_f is ok.

2. and also in board_init_r(), the serial_puts sometimes put correctly, sometimes not. and in board_init_f, it's fine for every time.

as flollow is my serial.c functions

int serial_init (void) { volatile u32 *uart0_config = (volatile u32*)(UART0_ADDR + UART0_CTL);

/* Set parity, stop bits and word length to 8N1 */ *uart0_config = UART0_CONFIG_VAL; // serial_setbrg(); /*in our fpga board, baurate is fixed at 57600 */

return 0; }

void serial_setbrg (void) { volatile u32 *uart0_clk = (volatile u32*)(ACTIONS_CMUHOSC_ADDR + UART0_CLK_CON);

/* Set uart0_clk_con */ *uart0_clk = (((CORE_CLK_HZ/(CONFIG_BAUDRATE * 8))&0x0000FFFF) | (UART0_50DIV_SEL&0x00070000) | (UART0_CLK_EN&0x00080000));

}

void serial_putc (const char c) { volatile u32 *uart0_stat = (volatile u32*)(UART0_ADDR + UART0_STAT); volatile u32 *uart0_txdata = (volatile u32*)(UART0_ADDR + UART0_TXDATA);

if (c == '\n') serial_putc ('\r');

/* Wait for fifo to shift out some bytes */ while((*uart0_stat&UART0_STAT_TXFULL)); // the tx full bit means the fifo is full *uart0_txdata = (u32)c; }

void serial_puts (const char *s) { while (*s) { serial_putc (*s++); } }