[meta-freescale] [yocto][sabrelite][boundary]Sabre Lite board does show nothing on LVDS screen , only black screen

[Simon Egli]

Yes, this and having different local.conf etc. which I found (on a link from your suggested site) did the trick. 

For the archive / people with similar problems: https://boundarydevices.com/fido-release-of-yocto/

Thank you for pointing me in to the right direction. 

Cheers,

Simon Egli

Embedded Software Ingenieur
Direkt: +41 44 315 63 66
--
MAKING VISIONS WORK.

bbv Software Services AG | Binzmühlestrasse 56 | CH-8050 Zürich
www.bbv.ch | simon.egli at bbv.ch

________________________________________
Von: Gary Bisson <gary.bisson at boundarydevices.com>
Gesendet: Donnerstag, 26. November 2015 00:45
An: Simon Egli
Cc: meta-freescale at yoctoproject.org
Betreff: Re: [meta-freescale] [yocto][sabrelite][boundary]Sabre Lite board does show nothing on LVDS screen , only black screen

Hi Simon,

On Tue, Nov 24, 2015 at 1:58 PM, Simon Egli <simon.egli at bbv.ch> wrote:
> Hello,
>
>
> we have a problem with our Boundary devices sabre lite board not showing any
> output on the LVDS display after u-boot.
>
>
> The u-boot version number is shown for a brief moment and after that nothing
> is shown on the standard LVDS displays (we used the 7" and the 10" standard
> screens), no splash screen and then no console after boot up.
>
> We can see the system booting up fine on the serial console.
>
> Initially we thought the error lays with our own custom yocto image, but
> even when using a recent vanilla freescale-community-bsp and building
> core-image-x11 nothing is shown on the display.
>
> We can see that the backlight of the screen gets turned on and off several
> times during boot-up, this happens also when we restart the x-server
> (startx).
>
>
> We also played around witht the u-boot bootargs parameters - to no success.
>
>
> I also upgraded u-boot (o 2015-07-150818-g17f9e5f) with imx_usb, but then
> the image would not start at all and so downgraded again.
>
>
> We tried two different boards and the two standard LVDS displays, different
> sd cards and in different states of plugged in hardware (no LVDS, no
> keyboard, everything connected, ...)
>
> The hardware works with the stock image that came with the boards.
>
>
> The thing is, our yocto environment worked around october 2015 and now
> doesn't.
>
> It also seems strange to us that a vanilla fsl-community-bsp build does not
> work.
>
>
> I searched in the archives and on google, but found nothing relating to this
> problem.
>
>
> Here is some information that might solve this (sorry for making this a very
> long e-mail):
>
>
> u-boot printenv:
>
> U-Boot 2014.07-00136-gf870252 (Sep 22 2014 - 09:16:34)
>
>
>
> CPU:   Freescale i.MX6Q rev1.2 at 792 MHz
>
> Reset cause: POR
>
> Board: SABRE Lite
>
> I2C:   ready
>
> DRAM:  1 GiB
>
> MMC:   FSL_SDHC: 0, FSL_SDHC: 1
>
> SF: Detected SST25VF016B with page size 256 Bytes, erase size 4 KiB, total 2
> MiB
>
> Display: LDB-WXGA (1280x800)
>
> In:    serial
>
> Out:   serial
>
> Err:   serial
>
> Net:   using phy at 6
>
> FEC [PRIME], usb_ether
>
> Hit any key to stop autoboot:  0
>
> U-Boot > printenv
>
> baudrate=115200
>
> board=sabrelite
>
> bootargs=bootargs=mxcfb1:dev=ldb,LDB-XGA,if=RGB666
>
> bootcmd=for dtype in ${bootdevs}; do if itest.s "xusb" == "x${dtype}" ; then
> us;
>
> bootdelay=1
>
> bootdevs=sata mmc usb
>
> clearenv=if sf probe || sf probe || sf probe 1 ; then sf erase 0xc0000
> 0x2000 &i
>
> console=ttymxc1
>
> cpu=6Q
>
> ethact=FEC
>
> ethaddr=00:19:b8:01:9d:e8
>
> ethprime=FEC
>
> fdt_addr=0x11000000
>
> fdt_high=0xffffffff
>
> initrd_high=0xffffffff
>
> loadaddr=0x12000000
>
> loadsplash=if sf probe ; then sf read ${splashimage} c2000 ${splashsize} ;
> fi
>
> panel=LDB-WXGA
>
> stdin=serial,usbkbd
>
> stdout=serial,vga
>
> umsdevs=sata mmc
>
> upgradeu=for dtype in ${bootdevs}; do for disk in 0 1 ; do ${dtype} dev
> ${disk}e
>
> usbnet_devaddr=00:19:b8:00:00:02
>
> usbnet_hostaddr=00:19:b8:00:00:01
>
> usbrecover=setenv ethact usb_ether; setenv ipaddr 10.0.0.2; setenv netmask
> 255.0
>
>
>
> Environment size: 1903/8188 bytes
>
> full core-image-x11 startup:
>
> U-Boot 2014.07-00136-gf870252 (Sep 22 2014 - 09:16:34)
>
> CPU:   Freescale i.MX6Q rev1.2 at 792 MHz
> Reset cause: POR
> Board: SABRE Lite
> I2C:   ready
> DRAM:  1 GiB
> MMC:   FSL_SDHC: 0, FSL_SDHC: 1
> SF: Detected SST25VF016B with page size 256 Bytes, erase size 4 KiB, total 2
> MiB
> Display: LDB-WXGA (1280x800)
> In:    serial
> Out:   serial
> Err:   serial
> Net:   using phy at 6
> FEC [PRIME], usb_ether
> Hit any key to stop autoboot:  0
> AHCI 0001.0300 32 slots 1 ports 3 Gbps 0x1 impl SATA mode
> flags: ncq stag pm led clo only pmp pio slum part
> No port device detected!
> ** Bad device size - sata 0 **
>
> SATA device 1: unknown device
> ** Bad device sata 1 **
> MMC: no card present
> MMC: no card present
> ** Bad device mmc 0 **
> switch to partitions #0, OK
> mmc1 is current device
> reading /6x_bootscript
> 2919 bytes read in 17 ms (167 KiB/s)
> ## Executing script at 10008000
> reading uEnv.txt
> ** Unable to read file uEnv.txt **
> reading /imx6q-sabrelite.dtb
> 42348 bytes read in 24 ms (1.7 MiB/s)
> Setting bus to 1
> Error writing the chip.
> !!!!!!!!!!!!!!!!
> warning: your u-boot may be outdated, please upgrade
> !!!!!!!!!!!!!!!!

As the warning says you need to upgrade your U-Boot to v2015.07.
Without this update, display detection will fail.
Please read this post:
https://boundarydevices.com/compiling-latest-u-boot-for-i-mx6-2015-edition/

Quick note: once you have flashed this new U-Boot, make sure to clear
the previous U-Boot environment so the new display properties can be
set.

Regards,
Gary