i.MX ProcessorsのトピックRe: VDDM voltage problem

VDDM voltage problem

MarcellusPereir — Thu, 16 Aug 2012 23:03:31 GMT

Hi guys!

After some problems, I could finally assemble my i.MX233 board.

In the first test, however, it doesn't boot. The VDDM, connected to VDDIO_DRAM (as in the EVK) remains at zero Volts. When connected to USB, the PC "sees" the board, and the MfgTool shows "HID-Compliant Device", but it fails to upload the images.

The Debug UART shows the following:

"HTLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLFC

PowerPrep start initialize power...
Battery Voltage = 0.82V
No battery or bad battery detected!!!.Disabling battery voltage meHTLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLFC
PowerPrep start initialize power...
Battery Voltage = 0.82V
No battery or bad battery detected!!!.Disabling battery voltage me" and goes on.

I'm using the internal regulators and the 3.3V line is ok, as the 1.2V line. Only the 2,5V remains in zero Volts.

Am I missing something?

Thank you very much,

Marcellus Pereira

Re: VDDM voltage problem

admin — Wed, 22 Aug 2012 13:27:40 GMT

Try default BSP. If the results are same, I think you need check hardware connection of BGA pins.

Re: VDDM voltage problem

MarcellusPereir — Wed, 22 Aug 2012 13:55:38 GMT

That's the problem: I'm using the default images, from the MfgTool.exe subdirectories.

I realized that 2,5V power line must be "turned on" by software, inside the bootstrap. But I'm using the "default" bootstrap... and it seems to me that the problem is before this step.

I'm using the "USB Recovery Mode" to upload the images. The PC can "see" the board attached to USB port, the MfgTool.exe too. But when I try to upload the files (using "MX23 Linux Update profile"), the board seems to "reset". I can heard the noise of "new usb device attached to PC" and the Debug Uart shows the message

"HTLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLFC

It's really frustrating... :/

Do you know who am I? said:

Try default BSP. If the results are same, I think you need check hardware connection of BGA pins.

Re: VDDM voltage problem

guoming_pan — Mon, 24 Sep 2012 06:05:38 GMT

If the default image for our EVK board is used, it should be ok because the default image is for 2.5V DDR1. The VDDM output should be turned on by s/w and it will be done by the MfgTool with the correct image.

Please be reminded that the capacitance on VDDM should not be larger than 1uF because larger capacitance will need more time to charge it up and will cause boot failure then.

Re: VDDM voltage problem

pierreparent — Thu, 06 Mar 2014 23:52:09 GMT

Did you find where the problem came from?

I got the same issue.

Re: VDDM voltage problem

MarekVasut — Fri, 07 Mar 2014 00:47:26 GMT

Can you try using mainline U-Boot 2014.01 and the mxsldr tool for the upload ?

Re: VDDM voltage problem

fabio_estevam — Fri, 07 Mar 2014 02:01:52 GMT

What is the medium (SD card, NAND) you are trying to boot your board from?

As Marek suggested, please take a look at mx23evk and mx23olinuxino support in mainline U-boot.

Regards,

Fabio Estevam

Re: VDDM voltage problem

pierreparent — Fri, 07 Mar 2014 09:29:58 GMT

I replyed here: imx233 keeps rebooting while initializing power.