[Technical Issue] kernel hangs at Galcore and VPU Issue

[elliottyang]

Hi All

We are running at i.MX6 Dual Lite soc and our own board, the linux kernel version is 3.10.17(yocto).

When we start up the system, it would stop.

……

rtl8192cu: Board Type 0

rtlwifi: rx_max_size 15360, rx_urb_num 8, in_ep 1

rtl8192cu: Loading firmware rtlwifi/rtl8192cufw.bin

Galcore version 4.6.9.9754  <-----------stop at here

In order to fix the problem, I found an article that can fix my problem,

https://community.freescale.com/message/424352#424352

They changed in file imx6qdl-sabresd.dtsi as follows.

&cpu0 {

arm-supply = <&reg_arm>;

soc-supply = <&reg_soc>;

pu-supply = <&reg_pu>; /* use pu_dummy if VDDSOC share with VDDPU */

};

&gpc {

fsl,ldo-bypass = <0>; /* use ldo-bypass, u-boot will check it and configure */

fsl,wdog-reset = <1>; /* watchdog select of reset source */

pu-supply = <&reg_pu>; /* ldo-bypass:use pu_dummy if VDDSOC share with VDDPU */

};

&gpu {

pu-supply = <&reg_pu>; /* ldo-bypass:use pu_dummy if VDDSOC share with VDDPU */

};

&vpu {

pu-supply = <&reg_pu>; /* ldo-bypass:use pu_dummy if VDDSOC share with VDDPU */

};

But now, we found another issue, we couldn’t use GStreamer to streaming video via VPU codec.(If I don’t use VPU codec, GStreamer is work well.)

Here is my command:

gst-launch-0.10 mfw_v4lsrc ! video/x-raw-yuv,width=640,height=480 ! vpuenc codec=6 ! rtph264pay ! udpsink host=192.168.8.123 port=5000

and it’s the error massage:

MFW_GST_V4LSRC_PLUGIN 3.0.11 build on Aug 20 2014 13:45:43.

Setting pipeline to PAUSED ...

ERROR: Pipeline doesn't want to pause.

Setting pipeline to NULL ...

Freeing pipeline ...

My question is what’s the different about “pu_dummy” and “reg_pu” ?

Does anyone has any idea about this issue?

BTW, if we modify the device tree as the article, I can’t get 1.2V at VDDPU, it’s 0.095V.

Thanks a lot,

[tootzoe]

hello Elliott ynag,

thanks for sharing this good post, i can now run android5.0 sabreSD BSP on sabreLite board.

i'm  still using imx6q-sabresd.dts , but changed some pu-supply as you did above.

the key changes is replace pu_dummy with  pu_reg, and wdog-rese parameter,  after doing this, kernel 3.10 is run,  and i uncommented  two line in init.rc

on property:ro.debuggable=1

start console

i can now getting busybox prompt shell, 

[peixiuhui]

Hi Elliott Ynag,

I have the same question, what is the real cause?

[elliottyang]

Hi Pei xiuhui

I really don't know what's going on there, I used imx6dl-sabresd-ldo.dtb to instead of imx6dl-sabresd.dtb, and it works fine.

[elliottyang]

You guys are all right.

I try to rename imx6dl-sabresd-ldo.dtb to imx6dl-sabresd.dtb and boot again, it's works!

Thanks a lot,

Elliott

[fabio_estevam · Accepted solution]

Try booting the imx6dl-sabresd-ldo.dtb.

[Bio_TICFSL]

Hi Elliot,

From, imx6qdl-sabresd.dtsi:

&vpu { pu-supply = <&pu_dummy>; /* ldo-bypass:use pu_dummy if VDDSOC share with VDDPU */ };

The comment above seems to indicate that if you are using LDO-bypass mode you would set this to pu-dummy. And if you are bypassing the LDO you need to set to to reg_pu (which is what I think you need to do on your board to get the VPU initialized properly).

Hope it helps