On kzm9g board (rmobile SoC), autoboot fails if serial console cable is not
connected. When serial cable is not connected, serial error occurs and
some garbage comes in data register.
sh_serial_tstc() in serial_sh.c does not check error status and misunderstand
there is some input data. It is the reason that autoboot fails.
This patch adds checking error status in sh_serial_tstc().
This patch is based on v2013.01-rc1 tag of u-boot master git.
Signed-off-by: Tetsuyuki Kobayashi <k...@kmckk.co.jp>
---
Hello Iwamatsu-san,
I checked this patch only on kzm9g board. Other SH or rmobile SoC might
have the same problem.
drivers/serial/serial_sh.c | 20 +++++++++++++-------
1 file changed, 13 insertions(+), 7 deletions(-)
diff --git a/drivers/serial/serial_sh.c b/drivers/serial/serial_sh.c
index 3c931d0..ee1f2d7 100644
--- a/drivers/serial/serial_sh.c
+++ b/drivers/serial/serial_sh.c
@@ -117,6 +117,14 @@ static int serial_rx_fifo_level(void)
return scif_rxfill(&sh_sci);
}
+static void handle_error(void)
+{
+ sci_in(&sh_sci, SCxSR);
+ sci_out(&sh_sci, SCxSR, SCxSR_ERROR_CLEAR(&sh_sci));
+ sci_in(&sh_sci, SCLSR);
+ sci_out(&sh_sci, SCLSR, 0x00);
+}
+
void serial_raw_putc(const char c)
{
while (1) {
@@ -138,16 +146,14 @@ static void sh_serial_putc(const char c)
static int sh_serial_tstc(void)
{
+ if (sci_in(&sh_sci, SCxSR) & SCIF_ERRORS) {
+ handle_error();
+ return 0;
+ }
+
return serial_rx_fifo_level() ? 1 : 0;
}
-void handle_error(void)
-{
- sci_in(&sh_sci, SCxSR);
- sci_out(&sh_sci, SCxSR, SCxSR_ERROR_CLEAR(&sh_sci));
- sci_in(&sh_sci, SCLSR);
- sci_out(&sh_sci, SCLSR, 0x00);
-}
int serial_getc_check(void)
{
--
1.7.9.5
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