From 994852966d2e6cf98c1dbeea8ee62c233b305ffb Mon Sep 17 00:00:00 2001 From: Thomas Chou Date: Wed, 31 Mar 2010 08:30:08 +0800 Subject: [PATCH] altera_jtag_uart: bypass when no jtag connection This patch adds an option to bypass output waiting when there is no jtag connection. This allows the jtag uart work similar to a serial uart, ie, boot even without connection. This option is enabled with CONFIG_ALTERA_JTAG_UART_BYPASS Signed-off-by: Thomas Chou Signed-off-by: Scott McNutt --- drivers/serial/altera_jtag_uart.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/serial/altera_jtag_uart.c b/drivers/serial/altera_jtag_uart.c index fb28aa9eb9..2980e4d07c 100644 --- a/drivers/serial/altera_jtag_uart.c +++ b/drivers/serial/altera_jtag_uart.c @@ -38,8 +38,16 @@ int serial_init( void ) { return(0);} void serial_putc (char c) { - while (NIOS_JTAG_WSPACE ( readl (&jtag->control)) == 0) - WATCHDOG_RESET (); + while (1) { + unsigned st = readl(&jtag->control); + if (NIOS_JTAG_WSPACE(st)) + break; +#ifdef CONFIG_ALTERA_JTAG_UART_BYPASS + if (!(st & NIOS_JTAG_AC)) /* no connection */ + return; +#endif + WATCHDOG_RESET(); + } writel ((unsigned char)c, &jtag->data); } -- 2.25.1