On 12/09/2013 02:39 PM, Alexey Smishlayev wrote:
Dear Wolfgang Denk,
On 2013.12.09. 22:12, Wolfgang Denk wrote:
Dear Alexey Smishlayev,
In message 52A5D4F1.7020101@xtech2.lv you wrote:
What should I do to flash environment values directly to the board's NAND?
Why don't you just use "env import"?
I didn't have any information about that. Also, I would like to get done without entering the U-Boot prompt. I am flashing my board using the J-TAG - USB cable, and it will be much more simple and convenient if I'd be able to just write the binary images on the NAND flash.
So, there is no way to do something like that straight away?
I have no idea if something similar would work on your SoC, but I flash my Tegra devices as follows:
* Download a copy of U-Boot into RAM and execute it.
I use "tegrarcm" to download it (a method of talking to Tegra's boot ROM), but I imagine you could download using JTAG too.
* This U-Boot's bootcmd (specified in the attached device tree in my case) writes the desired binary to boot flash; I flash from the device itself rather than using JTAG/... for the actual flash writes.
* After flashing the U-Boot binary, the same U-Boot does "env default -f -a; saveenv" and hence re-initializes the environment in flash. You can easily "setenv foo bar" between those two commands for any custom overrides. You could even push a file into some known RAM location and run "env import" on it too...
* Reboot into the newly-flashed U-Boot.
The code is at: https://github.com/NVIDIA/tegra-uboot-flasher-scripts