On 03/11/14 08:54, Ryan Harkin wrote:

On 11 March 2014 13:45, Tom Gall <tom.gall@linaro.org mailto:tom.gall@linaro.org> wrote:

Anyone with a VE board ever encounter something like this?

Sounds like a power supply problem.

I'd contact support@arm.com mailto:support@arm.com for help.

You can also get a variable DC power supply for under $50 USD. Most embedded developers have several of these among a good scope and other hardware on their bench. Search also for "Benchtop power supply".

This variable power supply will allow you to adjust the DC power supply with fine granularity up and down at any voltage. When you review the board requirements, make sure your variable DC benchtop power supply can supply the require amount of current for the board.

Here is some examples:

http://www.mpja.com/Benchtop-Power-Supplies/products/2/

Variable DC power supplies are mandatory, when you "bring up" new boards. Small quantity manufactured boards often need to be treated like "first run" boards, due to the fact they are manufactured in small quantity. I always put new dev boards on a variable DC power supply during the initial "burn-in" life of the board to watch carefully for power consumption anomalies as various subsystems of the board initiate power draw. Some chips/systems use different voltages from the main power supply on the board (external wall wart transformer).....

Small production run boards often have some passive component substitutions on the power circuitry, that has not been property tested....sometimes. You may just have a flaky power supply from the vendor.... Put a DC voltage meter on the output, unloaded first then as the board loads (draws current) from the power supply. The power supply you are using may be "drawing down" too low on voltage, because it cannot supply the current draw (amperage) at the given voltage level. Or the supervisor circuit monitoring the voltage level, could be faulty. Hard to say without further testing.

YMMV, GoodHunting, James

---------- Forwarded message ----------
From: Bibhuti Panigrahi <bibhuti.panigrahi@linaro.org
<mailto:bibhuti.panigrahi@linaro.org>>
Date: Tue, Mar 11, 2014 at 5:14 AM
Subject: Issue while booting up VE board
To: Tom Gall <tom.gall@linaro.org <mailto:tom.gall@linaro.org>>


Hi Tom,
I am finding below issues while booting the Versatile Express board.
The board boots and u-boot prompt comes but after that it gets powered
down because of exceeding power limit (seems to be some PMIC issue).
Please find the detailed log below:

Cmd>
ARM V2M Boot loader v1.1.2
HBI0190 build 2199

ARM V2M Firmware v3.1.1
Build Date: Aug 20 2012

Date: Wed 13 Sep 2006
Time:     05:38:05

Cmd>

Powering up system...
Daughterboard fitted to site 1.

Switching on ATXPSU...
ATX3V3: ON
VIOset: 1.8V
WARNING: PSU 1V0  : 0.79V (21% error)

ERROR: PSU 1V0   outside limit, switching off...


Powering down, switching on UART0 bypass.

Powering down...
Disabling debug USB.
Switching off ATX PSU.
Board powered down, use REBOOT to restart
Cmd>

Please let me know if you have any pointer to this.

Regards,
Bibhuti


--
Regards,
Tom

"Where's the kaboom!? There was supposed to be an earth-shattering
kaboom!" Marvin Martian
Tech Lead, Graphics Working Group | Linaro.org │ Open source software
for ARM SoCs
w) tom.gall att linaro.org <http://linaro.org>
h) tom_gall att mac.com <http://mac.com>

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