i.MX ProcessorsのトピックRe: iMX6UL board bring-up problem

iMX6UL board bring-up problem

onursengoz — Thu, 06 Oct 2016 07:33:49 GMT

Hi,

I have a custom board which is based on i.MX6UL CPU. It has eMMC on it but I can not flash it.

For testing purposes I simplified ucl2.xml like;

<LIST name="eMMC" desc="Choose eMMC as media">
<CMD state="BootStrap" type="boot" body="BootStrap" file ="firmware/u-boot-imx6ulevk_sd.imx" ifdev="MX6UL">Loading U-boot.emmc</CMD>

<CMD state="BootStrap" type="jump" > Jumping to OS image.emmc </CMD>

</LIST>

I also modified the content of "mfgtool2-yocto-mx-evk-sdcard-sd2.vbs", SDCard to eMMC.

When I run this script, there is no debug output on UART.

But same simplification works for IMX6ULEVK even there is no SD card on it and I can see some outputs.

Between, on my board DDR test tool is able to work, I can do DDR stress tests. But it passes under the frequencies of 300MHz because my DDR routing has some length equalization problems.

I think this does not make any sense as this initial bootstrapping does not use ram.

So the questions are;

Is my assumption for ram usage in initial bootstrapping operation correct?

eMMC on the board has no function at this stage, right?

CPU works well as it can run ddr test software which means it has right voltage levels and clock source. Is that right?

So why this board does not work? Any idea?

Thanks and have a nice day..

Re: iMX6UL board bring-up problem

igorpadykov — Thu, 06 Oct 2016 08:13:03 GMT

Hi Onur

it uses ddr, so for running it on custom board its specific ddr

settings (found from ddr tester) should be entered to uboot *.cfg file

and then mfg tools firmware should be rebuilt with

$ bitbake fsl-image-mfgtool-initramfs

Best regards
igor
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Re: iMX6UL board bring-up problem

onursengoz — Fri, 07 Oct 2016 06:24:00 GMT

Hi,

I modified imximage.cfg of u-boot-imx-mfgtool according to my settings.

And compiled it like;

$ bitbake -f -c compile u-boot-imx-mfgtool

$ bitbake u-boot-imx-mfgtool

When I place the output u-boot file to firmware folder of manufacturing tool, it worked.. eMMC can be flashed and board runs..

Thanks and have a nice day..