[U-Boot] SD card building
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. Also there are no hidden file. What can be the solution for this.
Thanks in Advance!
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.
Also there are no hidden file.
No file is created. The u-boot binary is written directly to the card. The place for u-boot should be reserved when partitioning the card.
What can be the solution for this.
It works as expected.
HTH
Michal
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
participants (2)
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JYOTI DUBEY -
Michal Suchanek