Yocto U-boot problems

[ottoblom]

Hi There,

I'm trying out the new Yocto BSP 1.0.0 and so far it builds but I'm having some trouble getting mmc running in u-boot on our custom board. While troubleshooting this I ran into some trouble with GDB. If I build the full image (bitbake fsl-image-dfb) and dump that onto the SD card u-boot always comes up as follows

CPU:   Freescale i.MX6Q rev1.2 at 792 MHz

CPU:   Temperature 45 C, calibration data: 0x58d4f269

Reset cause: POR

Board: MX6Q/SDL-SabreSD

I2C:   ready

DRAM:  1 GiB

MMC:   FSL_SDHC: 0

MMC Device 1 not found

No MMC card found

Using default environment

However, when I use my BDI3000 and GDB to load the image ("u-boot-imx/2013.04-r0/git/u-boot") I can single-step through just fine, as soon as I "continue" it jumps into the weeds and nothing ever prints to the console. GDB u-boot debugging works fine on the old LTIB 4.1.0 BSP.  I don't necessarily need gdb, but the problem is that the compile-test-repeat cycle is at a glacial pace when rebuilding the whole SD card image. Any ideas on what could be the culprit ?

I noticed there is a "u-boot-imx6qsabresd.imx" file in the images directory. What is this file used for ? I'm hoping that can be copied directly to an SD card somehow.

Thanks,

/Otto

[ottoblom · Accepted solution]

The problem had to do with changes we made the board. For anyone else interested in what the imx uboot file is - It can be written to a sdcard as follows

sudo dd if=tmp/deploy/images/imx6qsabresd/u-boot.imx of=/dev/sdc bs=512 seek=2