Page 1 of 1

How to flash u-boot?

Posted: Sat May 09, 2015 12:45 pm
by dopesoul
I would like to do some experiment with u-boot.
How do I flash it?

Re: How to flash u-boot?

Posted: Sun May 10, 2015 12:11 pm
by Vonger
Very easy.

First, make a writable uboot section(update VOCORE.dts, remove read-only in uboot section, compile and flash to VoCore)
Then, use mtd -e uboot write ubootimage.bin uboot

But if you do not have skill recover the uboot, I do not recommend you do this. Once uboot broken, there is no easy way to recover.
My way is remove flash from VoCore and flash the flash by other hardware.

Re: How to flash u-boot?

Posted: Sun May 10, 2015 12:21 pm
by noblepepper
This is inherently dangerous, you can easily brick the VoCore. If you load a non-functional uboot or there are power problems during the flash you have a brick. I made sure I could load the flash chip directly before I played with the u-boot partition.

Here is some info on how to do this: DANGEROUS STUFF

You may want to check out my revisions of the stock uboot.

Re: How to flash u-boot?

Posted: Mon May 18, 2015 7:41 pm
by Ton
Hi noblepepper,

I am going to try your dangerous stuff on my bricked vocore. I will use a raspberry instead of the arduino you used.
Which file contains the binary data that has to be flashed into the chip?
There are a couple of files in the /bin/ramips directory, I guess one of them?

Re: How to flash u-boot?

Posted: Tue May 19, 2015 4:31 am
by qiqiji
noblepepper‘s DANGEROUS STUFF i have done tons of times with no problem :D

Re: How to flash u-boot?

Posted: Tue May 19, 2015 2:31 pm
by noblepepper
For the uboot I modified use this file

For the original that came on the VoCore use this file

I have found that if you don't hold reset low sometimes the flashing operation is corrupted so I hold it low when I write the flash directly

Re: How to flash u-boot?

Posted: Tue Jan 03, 2023 6:24 am
by ad7zj
Unfortunately the link to noblepepper's wiki is dead - anyone have an alternate source? I want to backup my flash image and then re-flash his latest uboot build to try.

Re: How to flash u-boot?

Posted: Mon Feb 13, 2023 5:48 am
by ad7zj
Alright well I was able to get noblepepper's uboot flashed on and it works - and now I can boot the latest builds of openwrt! One question, maybe vonger knows - when I tried to copy uboot into mtd, it failed - I guess the mtd is locked? How to unlock it?
Code: Select all
root@OpenWrt:/tmp# mtd -e uboot write uboot.img uboot
Could not get MTD device info from uboot
Can't open device for writing!

Well to work around this, I used uboot itself to flash the new uboot image, as is described in "Fix Bricked Vocore" here except instead of erase linux, and cp.linux, I use erase uboot and cp.uboot.