[U-Boot-Users] implementation of lowboot for pq2fads-zu board
Jerry Van Baren
gerald.vanbaren at smiths-aerospace.com
Fri Nov 3 16:10:12 CET 2006
Ben Warren wrote:
> On Fri, 2006-11-03 at 04:03 -0800, Nethra wrote:
>> kindly suggest the changes to be done.
>> 2. if i want do changes in u-boot-1.1.1for custom board what are all the
>> changes to be done.
> Here are the initial steps. Once you've completed them, feel free to
> post follow-on questions:
> 1. The U-boot code that you have is old. Please get the latest,
> nominally version 1.1.6, which is available at
> You'll need to install and learn the 'git' source code control
> application. I'd explain how, but you'll learn much more if you figure
> it out for yourself. Google will help you here. OK, here's one link:
> 2. Read the excellent documentation at
> 3. Read the README that accompanies the U-boot code. There is a section
> on code porting that will be useful. There is also lots of
> documentation in the /doc directory, some of which may be helpful to
> 4. Read and understand the source code for the 'pq2fads' board that your
> custom board is based on.
Do all of the above, then when you make your configuration, use the
$ make PQ2FADS-ZU_lowboot_config
Look at the top level Makefile to see what it is doing, it is putting
some customizing stuff in the include/config.h file (make the
configuration and then look in the config.h file).
You need to switch a jumper J7 to short pins 1-2 (default is 2-3) to
switch from fetching the HRCW from the BCSR register to fetching the
HRCW from flash.
DON'T erase the high boot version of u-boot - by switching the jumper J7
back, you can recover from loading a bad u-boot in the lowboot position
by reloading a good lowboot u-boot. DAMHIKT.
More information about the U-Boot