8MMINID4-EVK Shutdown feature convert into reboot (while Power is on )

cancel
Showing results for 
Search instead for 
Did you mean: 

8MMINID4-EVK Shutdown feature convert into reboot (while Power is on )

144 Views
Contributor II

Hi Team,

We have Development Boards & Kits - ARM 8MMINID4-EVK , we are using Android image . 

Our requirement is when user give reboot -p  / Shutdown , Device should not going in shutdown mode its start rebooting only ( if board have power ) . so use case is if power off then and then device shutdown other wise it always in on condition . 

Tags (1)
7 Replies

11 Views
NXP TechSupport
NXP TechSupport

Hi nikunj

on 8MMINID4-EVK schematic SPF-35104 p.12 power off and reboot are controlled

by PMIC_ON_REQ and WDOG_B signals

i.MX 8M Mini Evaluation Kit DDR4 Design Files

So one can try to change them in power drivers.

Best regards
igor
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

0 Kudos

11 Views
Contributor II

can you please elaborate more on power drivers change .

are you talking about  software change ???

0 Kudos

11 Views
Contributor II

Hi igor ,

More clarification on this .

We don't have any control on hardware Buttons , so we have to do in software timers . as i am going through "IMX8MMRM" user manual , it shows that using below steps we can "OFF to ON, by timer

alarm" 

1. Timer alarm in SNVS is programmed by software before SoC goes OFF.
2. SoC enters OFF mode.
3. Upon timer limit, wake up alarm goes '0'. PMIC_ON_REQ goes '1'.
4. External regulator is enabled by PMIC_ON_REQ = 1.

can u have any idea regarding timer alarm or alarm_mask / wake up alarm , how they can configure in software ? 

is there any steps for doing this 

Thank you for your support 

Nikunj 

Power_mode_transitions_1.PNGPower_mode_transitions_2.PNG

0 Kudos

11 Views
NXP TechSupport
NXP TechSupport

for software changes one can consider for example

imx-snvs-poweroff.c\reset\power\drivers - linux-imx - i.MX Linux kernel 

>can u have any idea regarding timer alarm or alarm_mask / wake up alarm , how they can configure in software ?

rtcwakeup.c\mxc_rtc\test - imx-test - i.MX Driver Test Application Software 

Best regards
igor

11 Views
Contributor II

Hi Igor,

we perform changes in power drive as suggested by you below are the test  scenario we perform,

1) wrote 0x300060 into 0x30370038 register of processor
2) after implement new value in register board shutdowns 
3)  when i press ONOFF button for ~1 sec the board boots up again
logs :- 
evk_8mm:/ # devmem 0x30370038 w 0x300060
/dev/mem opened.
Memory mapped at address 0xf7467ce87000.
Value at address 0x30370038 (0xf7467ce87038): 0x300020
Written 0x300060; readback 0x300060
But our use case is device never ever gone in off state ( when system is connected to power )
Please suggest change in power drive to enable that functionality .
we need OFF to ON, by timer alarm implementation 
as per manual we can do this using LP Wake-up interrupt enable (please guide us on this )SNVS_feature_List.PNG
0 Kudos

11 Views
NXP TechSupport
NXP TechSupport

Hi nikunj

these changes  may be not so simple and they do not follow standard usage

of these signals. For such kind of development may be suggested to proceed with help of

Professional Engineering Services | NXP 

Best regards
igor

11 Views
Contributor II

Ok Thank you for your support 

0 Kudos