• State Resolved
  • Locked Locked
  • Replies 5 replies
  • Subscribers 99 subscribers
  • Views 540 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

why the LCD is black

yifeng zhong
Prodigy 110 points

hello everyone 

I am using  the Blaze board to run Android 4.0 system which have the Linux kernel 3.0.8.

the u-boot ,x-loader and kernel is downloaded and built by the  [L27.IS.2.P2 OMAP4 Icecream Sandwich Release Notes] which is recorded in http://omappedia.org/wiki/L27.IS.2.P2_OMAP4_Icecream_Sandwich_Release_Notes   .

Now the kernel can start normally ,but the LCD scree only flashed once at kernel starting. after starting ,the kernel always black.the strange　log is 

    6.706115] cannot apply mgr(lcd) on inactive device
[    6.711791] omapfb omapfb: failed to apply dispc config
[    6.720703] cannot apply mgr(tv) on inactive device
[    6.726257] omapfb omapfb: failed to apply dispc config
[    6.735015] cannot apply mgr(lcd2) on inactive device
[    6.740692] omapfb omapfb: failed to apply dispc config
anybody can give me some advise?
thanks
zhong yifeng

  • 0
    TI__Expert 8055 points

    The messages that you showed ("cannot apply mgr ...") are not necessarily a problem, as I see these same messages on a working system that boots to the Android UI.

    Can you please post your full console log and logcat?  Also, you mentioned that you downloaded and built the u-boot, x-loader, and kernel per the Release Notes.  What about the filesystem?  Are you using a Blaze or Blaze Tablet and booting from eMMC or SD card?

    Regards,

    Gina

  • 0 in reply to Gina Glaser
    Prodigy 110 points

    Hi Gina

    thanks for your reply .

    Now I am in home ,I can not post the console log.I will do it tomorrow.

    building the file system cost a lot of time . and I think that at least the LCD can be show something

    if  Linux kernel started normally . so  I do not compile the filesystem. just used the root filesystem form

    another old project.  am I wrong?

     

    BestRegards

    zhong yifeng

  • 0 in reply to yifeng zhong
    TI__Expert 8055 points

    The TI software releases are intended to be used with the x-loader, u-boot, kernel, and Android filesystem versions specified in the release notes for that particular release.  If you have a mis-matched kernel and filesystem, there is no guarantee that it will work; likely it will not.  There are components, such as the graphics, that must be matched between the kernel and filesystem versions, which would likely explain why you don't have any display.  It is not worth to debug this further; instead, please ensure that you are using the correct Android filesystem for this release.

    Regards,

    Gina

  • 0 in reply to Gina Glaser
    Prodigy 110 points

    Thank you very much ,I compile the file system ,and use it ,the problem is solved. 

  • 0 in reply to Gina Glaser
    Prodigy 30 points

    Thank you for this.