Utilite support

[Bernd Walter]

On Fri, Nov 21, 2014 at 08:35:56AM -0700, Ian Lepore wrote:
> On Fri, 2014-11-21 at 14:04 +0100, Waschbüsch Martin wrote:
> > > Am 20.11.2014 um 18:19 schrieb Ian Lepore <ian at FreeBSD.org>:
> > > 
> > > There is some chance that "it might just work."  Actually a better
> > > chance now than when I originally wrote that. :)  Try using crochet for
> > > wandboard and in the wandboard kernel config file change FDT_DTS_FILE to
> > > "imx6q-cm-fx6.dts".  There's a good chance you'll end up with a bootable
> > > image on an sdcard.
> > > 
> > > You will need a serial console for debugging, we don't support a video
> > > console yet on imx6 systems.  The Compulab FitPc2 x86 systems need a
> > > special serial debugging cable that you have to buy separately.  I hope
> > > that's not also the case with Utilite.
> > > 
> > > -- Ian
> > 
> > Hello Ian,
> > 
> > I tried to follow your suggestion, but realized that there might be
> > a significant difference between Wandboard and Utilite: Utilite does
> > not read u-boot from disk. Instead, it holds u-boot as 'firmware' in
> > a flash module.
> > Don't know why I had not realized this earlier, but anyway, I guess
> > if I had compiled it before, I would have noticed. So far I had played
> > around with pre-built Wandboard images...
> > What this means is that the current crochet scripts will fail because
> > the u-boot compilation for cm-fx6 will not output a u-boot.imx file and
> > is probably not needed anyway.
> > What I will try next is make a copy of crochet's boards/Wandboard to
> > boards/Utilite and try to adapt the setup.sh script.
> > Questions:
> > Are there requirements that u-boot must meet in order to boot ubldr? If
> > so, I'll have to look into rebuilding u-boot plus flashing that.
> > 
> > Martin
> 
> I'll attach the patches I use for building u-boot (I use the uboot for
> Technexion EDM modules for Wandboard too; wandboard uses technexion
> modules).  The API option is the main one for running ubldr.
> 
> Check whether the uboot on the Utilite has the 'bmode' command.  You may
> be able to insert an sdcard with a new uboot and freebsd on it and say
> "bmode mmc0" (or mmc1 or whatever) and the system will reset and boot
> from the sdcard instead of the flash.
> 
> My Cubox i4pro arrived yesterday.  Its uboot doesn't have the API option
> (they almost never do; linux doesn't use it).  I tried compiling the dtb
> into the kernel and launching it directly, and that fails because the
> cubox dts doesn't have a memory=<> property.  I think the uboot probably
> figures out the amount of ram and modifies the dtb it passes to the
> kernel.  Ick.  I hacked around that and now the kernel hangs as soon as
> initarm() installs new page tables.

So how is that uboot thing handled in this case?
Can you go and compile uboot from the same source as for a wandboard, or
do we need to have different source for each of the boards?
As you know I do own a bunch of different iMX6 boards and I'm happy to
do test boots and minor tweaking (if required by readin gschematics) on
all of them.

> So the barriers to launching a non-linux kernel using just what a system
> vendor provides are even bigger than I had imagined.

:-(

-- 
B.Walter <bernd at bwct.de> http://www.bwct.de
Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.