BeagleBone LCD4 Cape Android 4.1.2 No display

Larry Edington

Other Parts Discussed in Thread: DA8XX

Just received an LCD4 cape for the BeagleBone and I haven't been able to get the display to work in Android.

I do have access via the adb port so the board is running but not on the display.

It works fine with the Linux SD card provided with the BeagleBone.

I've tried the TI JB image download and have built from scratch from source with TI-Android-JB-4.1.2_AM335x_4.0.1.bin source as well as

the latest rowboat-android git process updates as of yesterday.

Neither work on the BeagleBone.

My rowboat built image works on the AM335xEVM_SK board.

I see the LCD entry in board-am335xevm.c but the system either doesn't seem to identify it or there is still something missing to enable that display.

I see the eeprom on the LCD4 board being read from the I2C port with a logic analyzer. I've tried all combinations of the eeprom ID switch.

Anyone else tried an LCD4 with Jelly Bean or any words of wisdom from the experts?

I've noticed 3 different posted online kernel build strings to make the kernel.

make ARCH=ARM CROSS_COMPILE=arm-eabi am335x_evm_android_defconfig

make ARCH=ARM CROSS_COMPILE=arm-eabi beaglebone_android_defconfig

make ARCH=ARM CROSS_COMPILE=arm-eabi CONFIG_MACH_OMAP3_BEAGLE

Which one is correct or are they all wrong?

A "do this" answer would be great but I I would love to see a "how to troubleshoot this" answer to gain a better understanding of this build system.

Thanks,

Larry E.

over 12 years ago

0 Vishveshwar Bhat over 12 years ago

TI__Genius 10210 points

The LCD4 cape rev A1 support was added to the rowboat kernel with the following patch. This was after the JB 4.1.2 release.
http://gitorious.org/rowboat/kernel/commit/af553a3e87b9fcfa520ba639da7404bd87c894ec

Newer cape revisions may not work. Please post the kernel log while booting. The identified cape is listed in the logs.

0 Larry Edington over 12 years ago in reply to Vishveshwar Bhat

Prodigy 40 points

Adding the code from that patch fixed it!

Thanks!

0 bilgin seckin over 12 years ago in reply to Larry Edington

Prodigy 10 points

how did you add that code to your image, I have same problem with you

0 Larry Edington over 12 years ago in reply to bilgin seckin

Prodigy 40 points

Go to the following web page:

http://gitorious.org/rowboat/kernel/commit/af553a3e87b9fcfa520ba639da7404bd87c894ec

This will show you code to add to the kernel/arch/arm/mach-omap2/board-am335xevm.c file.

The file name listed in the patch documentation shows arch/arm/mach-omap2/board-am335xevm.c and assumes you know that is in the kernel directory.

The additions are highlighted in green. Line numbers on the left side will guide you on where to drop the green highlighted code in.

0 WANG XIAN over 12 years ago in reply to Larry Edington

Prodigy 30 points

Hi,

I'm facing a same problem and the problem is not solved even after I patched the code. I'm using a Rev A1 of LCD4 cape board.

I have no display on my LCD when boot up, and can only have a 320*240 display with wrong scan rate (I guess) when put the SW1 to ON,OFF on cape board, while not working when put to OFF,OFF ( I suppose this should be the correct config ). Do you have any idea how it may happen? I guess should be too high refreshing rate but can't make sure.

Thanks.

0 Larry Edington over 12 years ago in reply to WANG XIAN

Prodigy 40 points

I think you may be missing the LCD data in the video driver file.

/kernel/drivers/video/da8xx-fb.static struct da8xx_panel known_lcd_panels[] = {

    /* Newhaven Display */
   [0] = {
       .name = "NHD-4.3-ATXI#-T-1",
       .width = 480,
       .height = 272,
       .hfp = 8,
       .hbp = 43,
       .hsw = 4,
       .vfp = 4,
       .vbp = 12,
       .vsw = 10,
       .pxl_clk = 9000000,
       .invert_pxl_clk = 0,
   },

Add the above and see if it fixes it. Change the [0] number to your next display number in the file.

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BeagleBone LCD4 Cape Android 4.1.2 No display