hello,
it looks that function serial_putc() is called before serial_init() (file cpu/arm920t/at91rm9200/serial.c. Function serial_putc() enters loop forever.
Suggested quick patch
static int initialized = 0;
/* bring flag initialized up in the end of the function serial_init() */
int serial_init (void)
{
/* make any port initializations specific to this port */
#ifdef CONFIG_DBGU
*AT91C_PIOA_PDR = AT91C_PA31_DTXD | AT91C_PA30_DRXD; /* PA 31 & 30 */
*AT91C_PMC_PCER = 1 << AT91C_ID_SYS; /* enable clock */
#endif
#ifdef CONFIG_USART0
*AT91C_PIOA_PDR = AT91C_PA17_TXD0 | AT91C_PA18_RXD0;
*AT91C_PMC_PCER |= 1 << AT91C_ID_USART0; /* enable clock */
#endif
#ifdef CONFIG_USART1
*AT91C_PIOB_PDR = AT91C_PB21_TXD1 | AT91C_PB20_RXD1;
/* arkady - this is not enough to write PDR
i want to make sure, that alternative function A is set */
*AT91C_PIOB_ASR = AT91C_PB21_TXD1 | AT91C_PB20_RXD1;
*AT91C_PMC_PCER |= 1 << AT91C_ID_USART1; /* enable clock */
/* arkady - i am not sure, that port B is enabled in the PCER */
*AT91C_PMC_PCER |= 1 << AT91C_ID_PIOB; /* enable PIOB */
#endif
serial_setbrg ();
us->US_CR = AT91C_US_RSTRX | AT91C_US_RSTTX;
us->US_CR = AT91C_US_RXEN | AT91C_US_TXEN;
us->US_MR =
(AT91C_US_CLKS_CLOCK | AT91C_US_CHRL_8_BITS |
AT91C_US_PAR_NONE | AT91C_US_NBSTOP_1_BIT);
us->US_IMR = ~0ul;
initialized = 1;
return (0);
}
void serial_putc (const char c)
{
if (!initialized) return;
if (c == '\n')
serial_putc ('\r');
while ((us->US_CSR & AT91C_US_TXRDY) == 0);
us->US_THR = c;
}