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| author | Thomas Chou <thomas@wytron.com.tw> | 2010-03-31 08:30:08 +0800 |
|---|---|---|
| committer | Scott McNutt <smcnutt@psyent.com> | 2010-04-24 18:21:23 -0400 |
| commit | 994852966d2e6cf98c1dbeea8ee62c233b305ffb (patch) | |
| tree | 191b401b163ca8f965224e9ed99a1b589ef16efc /drivers | |
| parent | 7e812f2e9cdac80f6287d4aee5deb434597c4f8b (diff) | |
| download | u-boot-imx-994852966d2e6cf98c1dbeea8ee62c233b305ffb.zip u-boot-imx-994852966d2e6cf98c1dbeea8ee62c233b305ffb.tar.gz u-boot-imx-994852966d2e6cf98c1dbeea8ee62c233b305ffb.tar.bz2 | |
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 <thomas@wytron.com.tw>
Signed-off-by: Scott McNutt <smcnutt@psyent.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | 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 fb28aa9..2980e4d 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); } |