RZ-G/RZG2 uboot
Contents
Starting Watchdog Timer
Preparation:
Remember to (" setenv wdt_timeout <seconds> ") before testing if you want board to reboot sooner. Otherwise, it will reboot after 1min due to the setting in the Device Tree.
Testing Phase:
Case 1: (which user replaces the wrong kernel Image or wrong dtb)
In this case, we are going to use 1 random kernel Image, and 1 device tree ( .dtb ) for our board.
For example: R-car M3 kernel Image + r8a774e1-hihope-rzg2h-ex.dtb.
Expected result: Board will stop at (" Starting kernel ..... ") due to the wrong kernel Image file. Board will reboot after the specified time which is set by user.
Case 2: (when loading a driver, kernel panic occurs because of loading driver fail and board stops booting) In this case, we will add a panic() function into one function of a driver such as probe() to create kernel panic, but make sure that you have included kernel.h to use this function.
For example: In the GPIO driver
#include <linux/kernel.h>
static int gpio_rcar_probe(struct platform_device *pdev)
{
struct gpio_rcar_priv *p;
struct resource *io, *irq;
struct gpio_chip *gpio_chip;
.......
panic("GPIO driver, Kernel panic\n");
.......
}
Expected result: When loading GPIO driver, kernel panic occurs and board stops booting. Board will reboot after the specified time which is set by user.
