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Re: u-boot fw_env for SD card based boot



On 2016-12-20, Simon H <btsimonh@googlemail.com> wrote:
> Got Debian working nicely on an allwinner device with SD boot.
>
> The uboot variables seem to be stored in a file boot.scr in mmcblk0p1
> (or are they in /boot/boot.scr?)

The u-boot environment is not typically stored in a file on
allwinner/sunxi platforms, rather it is usually stored on the raw deviec
of the boot media (SD/eMMC/NAND) directly at an offset.

The boot.scr is generated by flash-kernel, and you can use
/etc/default/flash-kernel to set some values such as the boot arguments
passed to the kernel.

Since allwinner platforms with mainline u-boot support distro_bootcmd,
you shouldn't typically need to change the default environment, the
flash-kernel boot scripts should work out of the box.


live well,
  vagrant

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