• Registered: 2010-10-07
  • Posts: 16

Topic: DCDC failure with battery plugged into Chumby

I have been working on come computer vision applications for the Chumby using an USB web cam plugged into the Chumby.  I also have a battery ( whatever the recommended fuji battery is ) in the Chumby.

I disconnected AC, while the web camera was plugged in.  The Chumby was on, and discharged itself.

Upon plugging in AC, and turning on Chumby, it was continuously rebooting.
I have a serial console wired to the unit, I noticed DCDC error indicating that the MCU was not seeing 5 volts ( even though the Chumby was plugged in ).


My apologies, I was so concerned about getting the Chumby fixed I did not grab a screen shot.  I removed the battery, and Chumby booted correctly.

Any ideas?

  • Registered: 2010-10-07
  • Posts: 16

Re: DCDC failure with battery plugged into Chumby

I plugged the battery back in, and the error came back.


e2fsck 1.41.5 (23-Apr-2009)
Superblock last mount time is in the future.  Fix? yes

/dev/mmcblk0p6 has filesystem last checked time in the future, check forced.
Pass 1: Checking inodes, blocks, and sizes
[    6.140000] power/linux.c - state_machine_work():814 - Allocating regulator
[    6.140000] stmp3xxx-battery stmp3xxx-battery.0: changed power connection to
ac/5v present
[    6.150000] power/ddi_bc_api.c - ddi_bc_StateMachine():138 - Switching sm fro
m -1 to 3
[    6.160000] power/ddi_bc_sm.c - ddi_bc_WaitingToCharge():668 - Voltage is rea
lly low.  16 < 2900.  Transitioning to conditioning...
[    6.180000] Battery charger: now conditioning
[    6.180000] power/linux.c - validate_dcdc4p2():714 - The DCDC appears to be o
ff.  Restarting it..