The cause of a reset is generally useful, and shouldn't be blindly cleared in the process of displaying it as a part of the boot announcement.
Stash the string representation in the environment variable "reset_cause".
Values include: "POR" - power on reset "CSU" - reset was the result of the csu_reset_b input "IPP-USER" - ipp_user_reset_b qualified reset "WDOG" - watchdog reset "JTAG-HIGH-Z" - HIGH-Z reset from JTAG "JTAG-SW" - software reset from JTAG "WARM-BOOT" - WARM boot was initiated by software
Signed-off-by: Eric Nelson eric.nelson@boundarydevices.com --- arch/arm/imx-common/cpu.c | 25 ++++++++++++++++--------- 1 file changed, 16 insertions(+), 9 deletions(-)
diff --git a/arch/arm/imx-common/cpu.c b/arch/arm/imx-common/cpu.c index 28ccd29..4a54051 100644 --- a/arch/arm/imx-common/cpu.c +++ b/arch/arm/imx-common/cpu.c @@ -28,6 +28,7 @@ char *get_reset_cause(void) { u32 cause; struct src *src_regs = (struct src *)SRC_BASE_ADDR; + char *rval = "unknown";
cause = readl(&src_regs->srsr); writel(cause, &src_regs->srsr); @@ -35,22 +36,28 @@ char *get_reset_cause(void) switch (cause) { case 0x00001: case 0x00011: - return "POR"; + rval = "POR"; + break; case 0x00004: - return "CSU"; + rval = "CSU"; + break; case 0x00008: - return "IPP USER"; + rval = "IPP-USER"; + break; case 0x00010: - return "WDOG"; + rval = "WDOG"; + break; case 0x00020: - return "JTAG HIGH-Z"; + rval = "JTAG-HIGH-Z"; + break; case 0x00040: - return "JTAG SW"; + rval = "JTAG-SW"; + break; case 0x10000: - return "WARM BOOT"; - default: - return "unknown reset"; + rval = "WARM-BOOT"; } + setenv("reset_cause", rval); + return rval; }
#if defined(CONFIG_MX53) || defined(CONFIG_MX6)