[U-Boot] SD card building

[Michal Suchanek]

On 31 January 2014 13:58, Michal Suchanek <hramrach at gmail.com> wrote:
> Hello,
>
> Is this actually documented somewhere for u-boot?
>
> There is lots about writing to flash memories in the manual but MBR
> coexistence does not seem to be covered.
>
> u-boot is not written as a file but in a fixed location on the card
> where the i.MX6 looks for a bootloader.
>
> So you have on your SD card.
>
> | MBR - 1sector | 1 free sector (you get here with bs=1k seek=1) |
> u-boot | some space | start of first partition 0 your files here |
>
> You should make your first partition start far enough that u-boot, its
> environment (if any), etc can fit before it on the SD card.
>
> On 31 January 2014 10:56, JYOTI DUBEY <jyoti0801 at gmail.com> wrote:
>> I want to boot a fresh nitrogen6x board with uboot which I compiled
>> recently.After a successful compilation I obtained u-boot.imx file which I
>> wanted to bunn on my SD card for booting.
>> I used "dd if=u-boot.imx of=/dev/sdb bs=1k seek=1" copy u-boot.imx file on
>> the SD card which gave me the following output
>> 327+0 records in
>> 327+0 records out
>> 334848 bytes (335 kB) copied, 0.00272321 s, 123 MB/s
>>>>sync
>> but actually nothing is getting Copied in the SD card.
>
> It's written above. 335k were copied.

However, nitrogen6x does not use the u-boot you just copied. It uses
u-boot which is in its ROM. You can probably chainload your new u-boot
or upgrade the u-boot in ROM but for booting form a SD card the u-boot
in the ROM should work: http://boundarydevices.com/u-boot-on-i-mx6/

HTH

Michal