topic Re: Re: Bootloader issues with SABRE iMX6Dl in i.MX Processors

Bootloader issues with SABRE iMX6Dl

k2 — Thu, 31 Oct 2013 22:33:43 GMT

The board doesn't see the bootloader on the SD card. I followed the user guide instructions for setting up a bootable SD card. Is there some code onboard that has to change ? The board came with Android by mistake. It works fine with the Android. Our design is to use the linux. Im using the downloaded bootloader images freescale supplied.

Re: Bootloader issues with SABRE iMX6Dl

AnsonHuang — Fri, 01 Nov 2013 02:28:41 GMT

Hi, King

You mean you are using i.MX6D SabreSD board or SabreAuto board? And it works fine booting up Android, but when you burn bootloader image to a SD card, it still boots up with Android? Please check the boot mode selection, make sure it boots up from the SD slot you want, and also make sure you have a bootable SD card, which means the uboot should write to the right place of SD card. Let me know you boot selection and uboot first, thanks.

Re: Bootloader issues with SABRE iMX6Dl

VladanJovanovic — Fri, 01 Nov 2013 06:30:40 GMT

Please send following info: what demo image are you using and exact command line you use to program u-boot to SD card.

And please check Linux User's Guide for info on programming bootloader/kernel/file system from command line in Linux.

Re: Bootloader issues with SABRE iMX6Dl

k2 — Fri, 01 Nov 2013 16:53:56 GMT

We have the iMX6DL SABRE Smart Devices board that comes with the 10 in. LCD. (1000 bucks/board).

It came with a an Android SD card image even thou we ordered LINUX.

So i'm stuck with being able to boot up Android using the Freescale supplied SD.

I followed the User Guide instructions to use the prebuilt images for u-boot and kernel for making a bootable SD card using the linux "dd" commands. Is there any special SW6 settings for booting to LINUX versus the Android ?

I dont see any documentation saying anything. I have (SW6) switches 2 and 7 - ON, rest OFF.

Its apparent that the bootloader isn't running. I'm monitoring the serial debug with minicom.

It works with Android but not with Linux u-boot. I've tried a bunch of different u-boot images. No luck.

So i'm looking for what i missed on this ?

Re: Bootloader issues with SABRE iMX6Dl

k2 — Fri, 01 Nov 2013 17:37:35 GMT

Heres what i tried.

We have the iMX6DL SABRE for Smart Devices board with a 10 in LCD.

i'm using the SD3 slot (J507) with SW6 settings of 2 & 7 = ON.

The linux commands i used are :

sudo dd if=u-boot-mx6dl-sabresd.bin of=/dev/sdb seek=2 skip=2 bs=512

the SD card is seen as sdb and sdb1 is the partition.

Kevin

Re: Bootloader issues with SABRE iMX6Dl

sinanakman — Fri, 01 Nov 2013 18:32:53 GMT

Hi Kevin, I have an sabre sd and I am running mainline u-boot without a problem. One thing you might want to keep an eye is, sabre sd will try to boot from the flash first. By holding certain buttons during boot you can force it to boot from SD. But the easiest is to wipe out what you have in the eMMC flash and when it fails to boot from there it will boot from your SD.

Hope this helps

Sinan Akman

Re: Re: Bootloader issues with SABRE iMX6Dl

EdSutter — Fri, 01 Nov 2013 20:02:25 GMT

A few thoughts...

1...

You may want to try to add "conv=fsync" to your dd line...

sudo dd if=u-boot-mx6dl-sabresd.bin of=/dev/sdb seek=2 skip=2 bs=512 conv=fsync

2...

I wasted some time because I had an old (non-high-density) card reader

with a high-density card. Make sure you're using a relatively new reader (or a low-density SD card).

Re: Re: Bootloader issues with SABRE iMX6Dl

LeonardoSandova — Fri, 01 Nov 2013 22:48:23 GMT

Which u-boot version are you using? 2013's u-boots are not padded, so they must be flash without the skip=2 and using the .imx binary. Also, As Ed metioned, make sure you sync.

Re: Bootloader issues with SABRE iMX6Dl

sinanakman — Sat, 02 Nov 2013 01:24:34 GMT

FWIW, I am using the ToT mainline u-boot and flashing with seek=1 bs=1k so I am not sure what that no padding refers to. Let me know if you need more information.

Re: Bootloader issues with SABRE iMX6Dl

LeonardoSandova — Sat, 02 Nov 2013 03:44:58 GMT

Correct. seek=1 bs=1k is fine, what I wrote is to omit the 'skip' parameter NOT the seek. More info on

uboot-imx.git - Freescale i.MX u-boot Tree

Re: Re: Bootloader issues with SABRE iMX6Dl

sinanakman — Sat, 02 Nov 2013 04:11:19 GMT

Hi Leonardo, thanks for the nice summary below. I just realized that what you were asking me above, you were probably intending asking to Kevin. As you confirmed, with seek and without skip I run u-boot without a problem. I only use the mainline u-boot though.

Thanks

Sinan Akman

Re: Bootloader issues with SABRE iMX6Dl

VladanJovanovic — Mon, 04 Nov 2013 08:39:51 GMT

Agree with this, have seen some older SD card readers cause problems with SDHC cards. Please try with different SD card reader to see if it changes anything.

Other thing to try would be to dump /dev/sdb and make sure that bootloader is written correctly.

Re: Re: Bootloader issues with SABRE iMX6Dl

EdSutter — Mon, 04 Nov 2013 12:27:25 GMT

Sinan,

Just curious, what is 'ToT' mainline?

Re: Re: Bootloader issues with SABRE iMX6Dl

EdSutter — Mon, 04 Nov 2013 13:11:25 GMT

Just a bit more regarding padding...

I spent a few days stumbling on this when using mainline uboot.

Refer to this thread for more info... https://community.freescale.com/thread/315097

Re: Re: Bootloader issues with SABRE iMX6Dl

sinanakman — Mon, 04 Nov 2013 16:51:30 GMT

Hi Ed, sorry for the acronyms. With ToT I refer to tip of the tree for the mainline git trees.

Thanks

Sinan Akman