On 31 January 2014 13:58, Michal Suchanek hramrach@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@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