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powerpc/boot: Parse chosen/cmdline-timeout parameter

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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>
This commit is contained in:
Simon Kagstrom 2014-10-28 12:19:00 +01:00 committed by Michael Ellerman
parent 90029640fd
commit 4b4b13d5fe
3 changed files with 17 additions and 6 deletions
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15
arch/powerpc/boot/main.c
View file

@ -144,13 +144,24 @@ static char cmdline[BOOT_COMMAND_LINE_SIZE]
static void prep_cmdline(void *chosen)
{
unsigned int getline_timeout = 5000;
int v;
int n;
/* Wait-for-input time */
n = getprop(chosen, "linux,cmdline-timeout", &v, sizeof(v));
if (n == sizeof(v))
getline_timeout = v;
if (cmdline[0] == '\0')
getprop(chosen, "bootargs", cmdline, BOOT_COMMAND_LINE_SIZE-1);
printf("\n\rLinux/PowerPC load: %s", cmdline);
/* If possible, edit the command line */
if (console_ops.edit_cmdline)
console_ops.edit_cmdline(cmdline, BOOT_COMMAND_LINE_SIZE);
if (console_ops.edit_cmdline && getline_timeout)
console_ops.edit_cmdline(cmdline, BOOT_COMMAND_LINE_SIZE, getline_timeout);
printf("\n\r");
/* Put the command line back into the devtree for the kernel */

2
arch/powerpc/boot/ops.h
View file

@ -58,7 +58,7 @@ extern struct dt_ops dt_ops;
struct console_ops {
int (*open)(void);
void (*write)(const char *buf, int len);
void (*edit_cmdline)(char *buf, int len);
void (*edit_cmdline)(char *buf, int len, unsigned int getline_timeout);
void (*close)(void);
void *data;
};

6
arch/powerpc/boot/serial.c
View file

@ -33,7 +33,7 @@ static void serial_write(const char *buf, int len)
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 @@ static void serial_edit_cmdline(char *buf, int len)
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 @@ static void serial_edit_cmdline(char *buf, int len)
break; /* Exit 'timer' loop */
}
udelay(1000); /* 1 msec */
}
} while (timer++ < timeout);
*cp = 0;
}