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, #define CONFIG_ALTERA_JTAG_UART_BYPASS Signed-off-by: Thomas Chou <tho...@wytron.com.tw> --- drivers/serial/altera_jtag_uart.c | 12 ++++++++++-- 1 files changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/serial/altera_jtag_uart.c b/drivers/serial/altera_jtag_uart.c index 9eccaa0..54d481b 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 (&jtag->data, (unsigned char)c); } -- 1.6.6.1 _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot