[U-Boot] building and updating u-boot on redboot based

[Vipul Jain]

Date: Sun, 21 Feb 2010 11:21:20 +0100
From: Matthias Kaehlcke <matthias at kaehlcke.net>
Subject: Re: [U-Boot] building and updating u-boot on redboot based
       board
To: Vipul Jain <vipulsj at gmail.com>
Cc: u-boot at lists.denx.de
Message-ID: <20100221102120.GR20201 at darwin
>
Content-Type: text/plain; charset=us-ascii

Hi,

El Sat, Feb 20, 2010 at 05:31:48PM -0800 Vipul Jain ha dit:

> 1. How to know if u-boot image I have build is build correctly?

the image is build correctly if the file u-boot.bin is
generated. another question is if this image is appropriate for your
board

> 2. I have redboot on my EP9302 SOC (Cirrus logic), can I load u-boot in
> memory and test if it works? What will be the memory address I need to
> download the image?

in order to start U-Boot from RAM you must define
CONFIG_SKIP_LOWLEVEL_INIT and CONFIG_SKIP_RELOCATE_UBOOT. the memory
address depends on your board. for a edb9302 try 0x01000000, for
edb9302a 0xc1000000

be aware that even if the U-Boot image starts from RAM this doesn't
mean automatically that it will boot on your board. when booting from
RAM low-level initialization is skipped (i.e. the environment set up
by redboot is used), when U-Boot boots from flash it is in charge to
do the low-level init.

> 3. How can I burn the u-boot image if I find every thing ok?

if your board is a Cirrus Logic edb9302, refer to the paragraph
"Download Utility" in chapter 7 of the technical reference
manual. otherwise consult the manual provided by your board
manufacturer.

i think you could skip step 2 (try to load U-Boot from RAM), as you
can always restore your RedBoot bootloader using the same procedure as
for flashing the U-Boot image

btw, which version of U-Boot are you using, the current development
version or a custom one?

best regards

--
Matthias Kaehlcke
Embedded Linux Developer
Barcelona

Hi Matthias,

   I am using the latest source of u-boot that I have gitted from git://
git.denx.de/u-boot.git
here.  Can you please also tell me how to find out memory address for any
particular
board to download u-boot image. either from u-boot source or from board
specific technical
manual (PRM).

Also, I did tried last night the following command and now board is not
responding to anything,
Is there any way to recover the board back either via software/jumper
setting or JTAG. if JTAG
I am not sure which one and how to go about it, if there any pointer to
these. I really appreciate
your help, in making newbies learn.

RedBoot> load -r -v -b 0x100000 -h 192.168.15.6
u-boot.bin
-

Raw file loaded 0x00100000-0x00119ee7, assumed entry at 0x00100000
RedBoot> fis write -f 0x60000000 -b 0x100000 -l 0x40000
<------------------------ I gave this number from some website

                                                  how to find this number ??

* CAUTION * about to program
FLASH
            at 0x60000000..0x6003ffff from 0x00100000 - continue (y/n)?
y
... Erase from 0x60000000-0x60040000:
..
... Program from 0x00100000-0x00140000 at 0x60000000:
..
RedBoot>
reset
... Resetting.


Regards,
Vipul.