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
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