powerpc/boot: Parse chosen/cmdline-timeout parameter
On some platforms a 5 second timeout during boot might be quite long, so
make it configurable. Run the loop at least once to let the user stop
the boot by holding a key pressed. If the timeout is set to 0, don't
wait for input, which can be used as a workaround if the boot hangs on
random data coming in on the serial port.
Signed-off-by: Simon Kagstrom <simon.kagstrom@netinsight.net>
[mpe: Changelog wording & whitespace]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
diff --git a/arch/powerpc/boot/serial.c b/arch/powerpc/boot/serial.c
index f2156f0..167ee943 100644
--- a/arch/powerpc/boot/serial.c
+++ b/arch/powerpc/boot/serial.c
@@ -33,7 +33,7 @@
scdp->putc(*buf++);
}
-static void serial_edit_cmdline(char *buf, int len)
+static void serial_edit_cmdline(char *buf, int len, unsigned int timeout)
{
int timer = 0, count;
char ch, *cp;
@@ -44,7 +44,7 @@
cp = &buf[count];
count++;
- while (timer++ < 5*1000) {
+ do {
if (scdp->tstc()) {
while (((ch = scdp->getc()) != '\n') && (ch != '\r')) {
/* Test for backspace/delete */
@@ -70,7 +70,7 @@
break; /* Exit 'timer' loop */
}
udelay(1000); /* 1 msec */
- }
+ } while (timer++ < timeout);
*cp = 0;
}