Hi All,
I'am porting eCos/RedBoot to Versatile/ARM926EJ-S with
Integrator/ARM966E as baseline. Thanks to this Saturday. It's the first time my
HyperTerminal got characters came from RedBoot. They were showed belowing.
RedBoot(tm)
Only 12 characters! I debug it and found that it got into a loop in
hal_diag.c:cyg_hal_plf_serial_putc().
After transmit the first 12 characters, the value of AMBA_UARTFR
register changed from 0x18 to 0x38.
So it cann't get out of the loop.
The Release version of UART is PL011 r1p3. The flowing is the relevant
code.
--------------------------------------------------------
#define AMBA_UARTFR_TXFF 0x20
#define AMBA_UARTFR_RXFE 0x10
#define AMBA_UARTFR_BUSY 0x08
// AMBA uart access macros
#define GET_STATUS(p) (IO_READ((p) + AMBA_UARTFR))
#define TX_READY(s) (((s) & AMBA_UARTFR_TXFF) == 0)
void
cyg_hal_plf_serial_putc(void *__ch_data, char c)
{
...
do {
status = GET_STATUS(base);
} while (!TX_READY(status)); // wait until ready
PUT_CHAR(base, c);
...
}
--------------------------------------------------------
Any help about this?
Best regards,
Tim
