Hello
I am using imx257
I want to add support for programming the spi flash m25p64 for imx257 .
I use the device program of atk source . I use the cygwin to compile it .
but ,I have no way to debug it ,then I add the following code in channel.c ,
I want to print something using uart5
void serial_setbrg(void)
{
//u32 clk = 33250000;
u32 clk = 49875000;
__REG(UART5_PHYS + UFCR) = 4 << 7; /* divide input clock by 2 */
__REG(UART5_PHYS + UBIR) = 0xf;
__REG(UART5_PHYS + UBMR) = clk / (2 * 115200);
}
void serial_putc(const char c)
{
__REG(UART5_PHYS + UTXD) = c;
/* wait for transmitter to be ready */
while (!(__REG(UART5_PHYS + UTS) & UTS_TXEMPTY))
;
/* If \n, also do \r */
if (c == '\n')
serial_putc('\r');
}
void serial_puts(const char *s)
{
while (*s)
serial_putc(*s++);
}
static int serial_init(void)
{
__writel(0x3, IOMUXC_BASE_ADDR + 0x060);//uart5_txd mux
__writel(0x3, IOMUXC_BASE_ADDR + 0x064);//uart5_rxd mux
__writel(0x80, IOMUXC_BASE_ADDR + 0x274);//uart5 RXD pad ctl
__writel(0x80, IOMUXC_BASE_ADDR + 0x270);//uart5 TXD pad ctl
__REG(UART5_PHYS + UCR1) = 0x0;
__REG(UART5_PHYS + UCR2) = 0x0;
while (!(__REG(UART5_PHYS + UCR2) & UCR2_SRST))
;
__REG(UART5_PHYS + UCR3) = 0x0704;
__REG(UART5_PHYS + UCR4) = 0x8000;
__REG(UART5_PHYS + UESC) = 0x002b;
__REG(UART5_PHYS + UTIM) = 0x0;
__REG(UART5_PHYS + UTS) = 0x0;
serial_setbrg();
__REG(UART5_PHYS + UCR2) = UCR2_WS | UCR2_IRTS | UCR2_RXEN |
UCR2_TXEN | UCR2_SRST;
__REG(UART5_PHYS + UCR1) = UCR1_UARTEN;
return 0;
}
I add the serail init in
atk_channel_init() function in channel.c like this:
case CHAN_UART:
/* service watchdog */
watchdog_service();
serial_init();
serial_puts("uart5 inited\n");
When I use the atk tool with my mx25_spi.bin using uart1.
The atk tool show ram kernel downloading fine,but it can not print the ("uart5 inited\n");
But when I add this code to the uboot,it work fine ,uart1 and uart5 can work at same time.
What is wrong?When the boot rom jump to mx25_spi.bin ,why uart5 can not work?
