PMIC reset reason list for TX2 MB2

Autonomous Machines Jetson & Embedded Systems Jetson TX2
1

I’ve looked for the max77620 datasheet but it’s not available on the Maxim website. What I need is a list of human readable reasons for the reported register values:

pmic: reset reason (nverc) : 0x0 ← appears after normal reboot
pmic: reset reason (nverc) : 0x10 ← appears after power cut
pmic: reset reason (nverc) : 0x40
pmic: reset reason (nverc) : 0x50

Can you please tell what are the corresponding reasons for these values? Or even better, if there are others that can be listed. Thank you!

3

please also access kernel documentation for reference,
i.e. $L4T_Sources/r32.6.1/Linux_for_Tegra/source/public/kernel/kernel-4.9/Documentation/devicetree/bindings/mfd/max77620.txt

4

Hi @JerryChang , the device-tree documentation only offers an example of adding a dt entry for the max77620, it does not mention what the reset reasons are as printed in MB2.

Please see for example this thread: Jetson TX2 reset\powerdown issue - #6 by kko-smol

Can you share what these values mean? Thank you

5

hello AlexCo,

please download Cboot Sources T186 via https://developer.nvidia.com/embedded/linux-tegra.
you should check below for the PMIC reset reasons.
for example,
$L4T_Sources/r32.6.1/Linux_for_Tegra/source/public/cboot/bootloader/partner/t18x/common/lib/linuxboot/t186/linuxboot_helper.c

        char *pmic_reset_reason_table[] = {
                                                                           "NIL_OR_MORE_THAN_1_BIT",
                                                                           "SHDN",     /* B0 */
                                                                           "WDOG",
                                                                           "HDRST",
                                                                           "TOVLD",
                                                                           "MBSLD",
                                                                           "MBO",
                                                                           "MBU",
                                                                           "RSTIN",    /* B7 */
        };