On 01/27/2011 02:40 AM, Sascha Hauer wrote:
Hi,
On Wed, Jan 26, 2011 at 09:20:11AM +0100, Vanalme Filip wrote:
Hi,
Anyone ported Barebox to Freescale's i.MX27PDK 3-stack ? I'm new to
Barebox (or any bootloader...) and I try to port it for my i.MX27PDK,
but did not succeed yet. I don't get anything on the console port yet.
I took the i.MX27ADS as a reference, copied all its files to a new
board directory, and started adjusting the files. Via the debug board
of the i.MX27PDK (containing a CPLD), I should be able to turn on some
debug leds very early in the boot process, but even this did not
succeed (yet...). I made changes in board_init_lowlevel() of
lowlevel_init.S to initialize the hardware. I guess
board_init_lowlevel() is one of the first functions that is executed.
Correct ? Because I didn't get it up and running, I tried to do
debugging with a PEEDI debugger. Anyone experience with it for
debugging Barebox ? I'm using PEEDI in combination with Eclipse
(Zylin) debugger. It looks like I have problems when trying to step in
assembler sources...
As a first step I would try to use barebox as a second stage loader
behind U-Boot or redboot or whatever is on your board. What do you have
on your board?
When using barebox as a second stage loader you can comment out
everything in board_init_lowlevel. Provided that you are using the
correct UART you should see something at this stage.
What silicon revision do you have on your board? Our i.MX27ads is rev
1 which has some incompatibilities to other revs, so maybe this is
where it breaks. Also, make sure that the SDRAM setup fits for your
board. For the lowlevel setup you might want to look at Freescale
provided sources.
Hope that helps
Sascha
I ported Barebox to our MX27 based design a while ago. Our design was
based on the IP-Cam, and I was able to get the I2C,Ethernet, and the HS
USB port running. I found the hardest part was getting the PLL config
work right. I finally just commented it out and let the defaults take
over. There are some nice ports already and I would suggest looking at
the systems part of Barebox already. Also start simple, disable
everything! Even tho the board has all the hardware, don't include it in
the beginning. I disabled USB,Ethernet,Display,I2C, and it helped a-lot.
After serial, I would add Ethernet if you are using it. I was simple as
turning it on. You will need to configure your MAC address. ;-)
As for debugging, I use a cheep olimex arm-usb-ocd (didn't have access
to the JTAG debuggers at work). Remember you have to setup your ram
before sending code to the board. As for a debugger, used gnu tools and
for the IDE I used insight. I run under Ubuntu and compiled the tools
from source. (bintools,gcc,gdb, insight)
Hope it helped.
James
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