Updating only the u-boot on eMMC

BeagleV
1

Hi Team!

I’ve recently become owner of my own BeagleV-Fire. Borad works like a charm. However, I look to utilize it to do some bare-metal programming. I would like to use existing HSS and U-Boot, but get rid of the Linux kernel for now. It can remain on the emmc. What I would like to do is overwrite the u-boot with own brewed version that has some extra commands added to env.
I noticed that there’s no way to change default environment for u-boot, which would spare me the rebuild and re-flash. I would appreciate all help.

2

Okay. A bit of self reply here. You can use boot.scr to change behavior. It doesn’t require any damaging actions. So, initial image can stay intact.

Guide:

  1. create new boot.scr
  2. use HSS to enable emmc as usb device:
    MMC
    USBDMSC
  3. Swap boot.src
  4. Be happy, new boot.src is used.
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