Re: [Gumstix-users] LCD fails to start of a sudden

[Victhor <vic...@gm...>]

I have tried reflashing U-Boot, with no success. I set the
defaultdisplay to lcd43. What is that GPIO command? U-Boot doesn't seem
to have one.
> Hopefully you hear from a few other people, because I can't claim to be 
> the expert especially for Overo, but it sounds like you have power to 
> the LCD and the back light is coming on -- otherwise it would not be 
> white at first.  But the screen will go gray if the back light enable 
> bit is turned off.
> 
> It is possible that the back light enable bit (dual purposes as PWM and 
> high/low in my system) is in the wrong state when the kernel starts up 
> somehow.  If you can determine which bit it is on the schematic, then 
> after it boots up you can query the state via a GPIO command.  There is 
> a gumstix How-to for this, I don't have the link right in front of me.  
> You can also reset the bit "manually" and see if the screen then comes on.
>    
> 
> Victhor wrote:
> > I have an Overo Fire and a Palo43 with the LG 4.3" LCD. Of a sudden, my
> > system stopped showing the splash screen. It still boots normally,
> > however. The screen is white when power is applied, but when the splash
> > screen was supposed to show up, a gray screen comes up instead. Xorg
> > starts but the screen is still gray.
> > This is the output of printenv:
> > bootcmd=if mmc init; then if run loadbootscript; then run bootscript;
> > else if run loaduimage; then run mmcboot; else run nandboot; fi; fi;
> > else run nandboot; fi
> > bootdelay=5
> > baudrate=115200
> > loadaddr=0x82000000
> > console=ttyS2,115200n8
> > dvimode=1024x768MR-16@60
> > mmcroot=/dev/mmcblk0p2 rw
> > mmcrootfstype=ext3 rootwait
> > nandroot=/dev/mtdblock4 rw
> > nandrootfstype=jffs2
> > mmcargs=setenv bootargs console=${console} vram=${vram} omapfb.mode=dvi:
> > ${dvimode} omapfb.debug=y omapdss.def_disp=${defaultdisplay} root=
> > ${mmcroot} rootfstype=${mmcrootfstype}
> > nandargs=setenv bootargs console=${console} vram=${vram}
> > omapfb.mode=dvi:${dvimode} omapfb.debug=y omapdss.def_disp=
> > ${defaultdisplay} root=${nandroot} rootfstype=${nandrootfstype}
> > loadbootscript=fatload mmc 0 ${loadaddr} boot.scr
> > bootscript=echo Running bootscript from mmc ...; source ${loadaddr}
> > loaduimage=fatload mmc 0 ${loadaddr} uImage
> > mmcboot=echo Booting from mmc ...; run mmcargs; bootm ${loadaddr}
> > nandboot=echo Booting from nand ...; run nandargs; nand read ${loadaddr}
> > 280000 400000; bootm ${loadaddr}
> > dieid#=44a800040000000004035c141700c01c
> > vram=16M
> > defaultdisplay=lcd43
> > stdin=serial
> > stdout=serial
> > stderr=serial
> >
> > Environment size: 1161/131068 bytes
> >
> >
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> 
> 
> ------------------------------------------------------------------------------
> Throughout its 18-year history, RSA Conference consistently attracts the
> world's best and brightest in the field, creating opportunities for Conference
> attendees to learn about information security's most important issues through
> interactions with peers, luminaries and emerging and established companies.
> http://p.sf.net/sfu/rsaconf-dev2dev
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