How to determine the reset reason?

ufechner — Thu, 26 Aug 2021 07:49:13 GMT

Hello,

How can I determine the reset reason of an i.mx6 dual processor using a custom hardware?

I found the following code in uboot:

static char *get_reset_cause(void) { u32 cause; struct src *src_regs = (struct src *)SRC_BASE_ADDR; cause = readl(&src_regs->srsr); reset_cause = cause; switch (cause) { case 0x00001: case 0x00011: return "POR"; case 0x00004: return "CSU"; case 0x00008: return "IPP USER"; case 0x00010: return "WDOG"; case 0x00020: return "JTAG HIGH-Z"; case 0x00040: return "JTAG SW"; case 0x00080: return "WDOG3"; case 0x00100: return "TEMPSENSE"; case 0x10000: return "WARM BOOT"; default: return "unknown reset"; } }

But which register is accessed? Is this register documented in any data sheet? Is it accessible also from Linux? What is the meaning of "CSU", "IPP_USER", "JTAG HIGH-Z", "JTAG SW" and "WDOG3"?

Re: How to determine the reset reason?

albe_merciai — Thu, 26 Aug 2021 09:23:58 GMT

Address: 20D_8000h base + 8h offset = 20D_8008h

https://www.nxp.com/webapp/Download?colCode=IMX6SDLRM

pag: 5039 - 5040 60.7.3 SRC Reset Status Register (SRC_SRSR)

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How to determine the reset reason?

Re: How to determine the reset reason?