Print the source of reset during boot.
Signed-off-by: Fabio Estevam fabio.estevam@freescale.com --- arch/arm/cpu/arm926ejs/mx25/generic.c | 25 ++++++++++++++++++++++++- 1 files changed, 24 insertions(+), 1 deletions(-)
diff --git a/arch/arm/cpu/arm926ejs/mx25/generic.c b/arch/arm/cpu/arm926ejs/mx25/generic.c index a4e8c14..047e49d 100644 --- a/arch/arm/cpu/arm926ejs/mx25/generic.c +++ b/arch/arm/cpu/arm926ejs/mx25/generic.c @@ -130,6 +130,28 @@ u32 get_cpu_rev(void) return system_rev; }
+static char *get_reset_cause(void) +{ + /* read RCSR register from CCM module */ + struct ccm_regs *ccm = + (struct ccm_regs *)IMX_CCM_BASE; + + u32 cause = readl(&ccm->rcsr) & 0x0f; + + switch (cause) { + case 0x0000: + return "POR"; + case 0x0001: + return "RST"; + case 0x0002: + return "WDOG"; + case 0x0006: + return "JTAG"; + default: + return "unknown reset"; + } +} + #if defined(CONFIG_DISPLAY_CPUINFO) int print_cpuinfo (void) { @@ -138,10 +160,11 @@ int print_cpuinfo (void)
cpurev = get_cpu_rev();
- printf("CPU: Freescale i.MX25 rev%d.%d at %s MHz\n\n", + printf("CPU: Freescale i.MX25 rev%d.%d at %s MHz\n", (cpurev & 0x000F0) >> 4, (cpurev & 0x0000F) >> 0, strmhz (buf, imx_get_armclk ())); + printf("Reset cause: %s\n\n", get_reset_cause()); return 0; } #endif