In the debug_ll_outc_a0 macro, a0 is written to the uart data register many times in a delay slot when the uart is not ready to send data. insert a nop to avoid this.
Signed-off-by: Du Huanpeng <[email protected]> --- arch/mips/include/asm/debug_ll_ns16550.h | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/mips/include/asm/debug_ll_ns16550.h b/arch/mips/include/asm/debug_ll_ns16550.h index df58c4c..cf666d1 100644 --- a/arch/mips/include/asm/debug_ll_ns16550.h +++ b/arch/mips/include/asm/debug_ll_ns16550.h @@ -88,6 +88,7 @@ static inline void PUTC_LL(char ch) 201: lbu t1, UART_LSR(t0) /* get line status */ andi t1, t1, UART_LSR_THRE /* check for transmitter empty */ beqz t1, 201b /* try again */ + nop sb a0, UART_THR(t0) /* write the character */ -- 2.7.4 _______________________________________________ barebox mailing list [email protected] http://lists.infradead.org/mailman/listinfo/barebox
