V2 RC10 via OE cross compile to OMAP3

[Marc Kleine-Budde]

Freeman P. Pascal IV wrote:
> On Sat, 2009-12-12 at 12:54 +0100, Sascha Hauer wrote:
>> On Thu, Dec 10, 2009 at 10:50:49PM -0700, Freeman P. Pascal IV wrote:
>>> Hello,
>>>         
>>>         I'm trying to build RC10 for use on an Archos 7 internet media
>>>         tablet.  The idea is to load u-boot V2 during the stage 3 boot
>>>         instead of the original modified initramfs image from flash.
>>>         I could then select which kernel and root file-system I use to
>>>         boot the rest of the way.
>>>         
>>>         On top of this, I am trying to use an OpenEmbedded overlay
>>>         that is based on the SDE (Special Developer Edition) release
>>>         provided by Archos.  I want to use the cross compiler
>>>         generated by the OE image in preparation for generating a
>>>         recipe for doing the same when building my release images.
>>>         
>>>         With a bit tweaking, I have been able to generate binaries for
>>>         RC10 for my Archos 7 and my BeagleBoard.  Both using the their
>>>         own cross compiler tools generated by their separate OE
>>>         projects.  This is using the patches for the OMAP3 found on
>>>         this list. 
>>>         
>>>         From what I have read, I should be able to copy the
>>>         executable
>>>         ELF binary (not the .bin file) on to my respective devices and
>>>         run it to test if it works.  When I do this, I get an "Illegal
>>>         instruction" error.
>>>         
>>>         Could I get someone to confirm or deny my assumption about
>>>         being able to test the elf binary on my devices?  Should I be
>>>         compiling the sandbox version for my devices instead of the
>>>         platform/board specific versions?
>> You cannot run the ELF file on your devices, you have to use the bin
>> file for this. The ELF file is only usable for the sandbox target in
>> which case you run it on the machine you compiled it on.
>>
>> Sascha
>>
> 
> Using the elf executable was really only a test to see if I had the
> compiler settings correct.  If it started up and got to a prompt I was
> going to be satisfied.  If it ran I could have some confidence it would
> do so once I moved into flash where my existing boot-load could execute
> it.
> 
> The problem is that the Archos 5 and Archos 7 are consumer devices with
> no exposed JTAG and no obvious serial port.  There is a recovery chain,
> but it requires that the original stage 0 boot-loader, stage 1
> boot-loader, and recovery flash image are all functional.  I want to
> preserve the original boot-loader, but use V2 to intercept loading the
> normal kernel and allow for pre-boot operations (such as selecting an
> alternate kernel, rootfs, or kernel arguments).  The whole idea is to
> try avoid bricking the device while still allowing some pre-boot
> flexibility.
> 
> Does anyone have any suggestions how to test and possibly debug without
> GDB support within the restrictions I listed above?  Qemu-omap3 could be
> an alternative, but I would have to emulate enough of the Archos
> hardware to make it possible.

If it's possible within your existing boot environment to load the
u-boot-v2.bin into your RAM and start it, then try it. The same
u-boot-v2 image can be started from RAM, NOR and NAND.

Cheers, Marc

-- 
Pengutronix e.K.                         | Marc Kleine-Budde           |
Linux Solutions for Science and Industry | Phone: +49-231-2826-924     |
Vertretung West/Dortmund                 | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686         | http://www.pengutronix.de   |

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