7'' LCD not working on PandaBoard with Linaro 2.3.5

Discuss TI Beagleboard, Pandaboard, their related extensions and accessories
esky-sh
Posts: 1435
Joined: Sat Dec 20, 2008 4:21 am

Re: 7'' LCD not working on PandaBoard with Linaro 2.3.5

Post by esky-sh » Thu Dec 22, 2011 6:38 pm

could you please provide log when you type 'reboot' command?
we need more information to identify if it is really return issue, since we are not in the same city and the international post will cause extra long delay.

fanchb
Posts: 9
Joined: Tue Dec 06, 2011 11:04 am

Re: 7'' LCD not working on PandaBoard with Linaro 2.3.5

Post by fanchb » Fri Dec 23, 2011 5:56 am

Hello,

Here is the log.

Thank you.
Attachments
Log - 20111223.zip
(13.2 KiB) Downloaded 281 times

esky-sh
Posts: 1435
Joined: Sat Dec 20, 2008 4:21 am

Re: 7'' LCD not working on PandaBoard with Linaro 2.3.5

Post by esky-sh » Fri Dec 23, 2011 7:54 pm

I had a look into your latest log and found the i2c write error disappeared after you reboot the software.
So the pwm backlight should work ok in this case.

Another mistake I found in your log

Code: Select all

reading boot.scr

462 bytes read
Loaded script from boot.scr
Running bootscript from mmc0 ...
appearently you were not using boot.scr from our ftp, instead you were using default one from linaro 11.09 'official' release.
and linaro default boot.scr will boot system to hdmi display instead of dvi/lcd.

suggestions:
1. Please copy the boot.scr file from our ftp to your boot partition of sd card.
and power your board together with beada frame and do the same reboot cycle throught serial console. please attach log message as what you did in your previous thread, if the backlight still not work.
2. Please change R7/R8 from 4.7k to 6.8k on your NBD01 board.
this will help a lot for verify of i2c write error.

fanchb
Posts: 9
Joined: Tue Dec 06, 2011 11:04 am

Re: 7'' LCD not working on PandaBoard with Linaro 2.3.5

Post by fanchb » Tue Jan 03, 2012 10:38 am

Hello,
Thank you for your last feedback, Android is booting now and the LCD works fine. I don't know why we had the wrong boot.scr on the SD card since I used your command present in the Android_Images_Installation_on_Pandaboard file and the boot.tar.bz2 was including the right boot.scr, so it is a mistery for me.

I did not have to type reboot to make it boot, nor to change the resistor.

We will order new LCDs soon!

I have a few questions: apart from the bootagrs in the boot.scr which is different from the Linaro version, how different is your Android version from the Linaro 11.09 ? It is possible to easily isolate the changes, build required drivers if any, and bring them in most recent Linaro releases like 11.11 ?

esky-sh
Posts: 1435
Joined: Sat Dec 20, 2008 4:21 am

Re: 7'' LCD not working on PandaBoard with Linaro 2.3.5

Post by esky-sh » Tue Jan 03, 2012 7:46 pm

fanchb wrote:Hello,
Thank you for your last feedback, Android is booting now and the LCD works fine. I don't know why we had the wrong boot.scr on the SD card since I used your command present in the Android_Images_Installation_on_Pandaboard file and the boot.tar.bz2 was including the right boot.scr, so it is a mistery for me.

I did not have to type reboot to make it boot, nor to change the resistor.

We will order new LCDs soon!

I have a few questions: apart from the bootagrs in the boot.scr which is different from the Linaro version, how different is your Android version from the Linaro 11.09 ? It is possible to easily isolate the changes, build required drivers if any, and bring them in most recent Linaro releases like 11.11 ?
2 differences:
1. boot.scr
2. uImage
uImage file is binary of linux kernel. you may check with the source code for difference between linaro 11.09 and our customzied version. In a short word, we add 3 drivers into this linaro kernel: backlight, touchscreen and RTC.

fanchb
Posts: 9
Joined: Tue Dec 06, 2011 11:04 am

Re: 7'' LCD not working on PandaBoard with Linaro 2.3.5

Post by fanchb » Fri Jan 13, 2012 10:59 am

Could you please let me know in which folder I can expect to find the right sources: Beada20111116 ?

Thank you!

fanchb
Posts: 9
Joined: Tue Dec 06, 2011 11:04 am

Re: 7'' LCD not working on PandaBoard with Linaro 2.3.5

Post by fanchb » Fri Jan 13, 2012 11:12 am

Woud you mind to give us the exact number of the Linaro build you are using for Release 11.09 ? It will help us to look at code differences. So far we have been comparing source code between Beada20111116 and build 3.0-2011.09 of the Linaro distribution. We have found many modifications in Drivers\Input\mouse we were not expecting since you were only mentioning 3 drivers, not including the mouse driver.

Thank you!

esky-sh
Posts: 1435
Joined: Sat Dec 20, 2008 4:21 am

Re: 7'' LCD not working on PandaBoard with Linaro 2.3.5

Post by esky-sh » Fri Jan 13, 2012 9:46 pm

1. Original linaro kernel source code is at here:
<project name="people/andygreen/repo-branch-archive" path="kernel" remote="linaro-other" revision="7840e5d9be030f239a5b40231a22a97bebad40b6"/>
2. Beada modified kernel source code:
/Beada20111107/Android/panda-linaro-android-3.0-kernel.tar.bz2

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