Re: [hawkboard] OE Kernel Not Booting

From: Christophe Aeschlimann <c.aeschlimann@acn-group.ch>
To: openembedded-devel@lists.openembedded.org
Subject: Re: [hawkboard] OE Kernel Not Booting
Date: Tue, 18 May 2010 15:36:45 +0200	[thread overview]
Message-ID: <4BF297ED.9060301@acn-group.ch> (raw)
In-Reply-To: <hstsna$uhr$1@dough.gmane.org>

Le 18.05.2010 13:12, Koen Kooi a écrit :
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> On 18-05-10 10:10, Christophe Aeschlimann wrote:
>> Le 18.05.2010 09:30, Koen Kooi a écrit :
>> On 18-05-10 09:27, Christophe Aeschlimann wrote:
>>>>> Hi,
>>>>>
>>>>> We are at least three hawkboard owners that have the same issue.
>>>>>
>>>>> Building org.openembedded.dev HEAD with
>>>>>
>>>>> MACHINE= "hawkboard"
>>>>> DISTRO = "angstrom-2008.1"
>>>>>
>>>>> produces a Kernel Image that cannot be booted on our hawkboards.
>>>>>
>>>>> The behaviour is the following with the following kernel bootargs :
>>>>>
>>>>> console=ttyS2,115200n8 root=/dev/nfs
>>>>> nfsroot=172.16.147.10:/srv/nfs/hawkboard ip=172.16.100.100
>>>>> eth=0a:c1:a8:12:fa:c0
>>>>>
>>>>>> U-Boot 2009.01-dirty (Nov 26 2009 - 02:15:00)
>>
>> Try the OE built u-boot.
>>
>>> Hi Koen,
>>
>>> I haven't been able to boot using the OE generated u-boot so far.
>>
>>> But I'm a bit confused about how everything is working together.
>>
>>> Don't you have to generate an AIS image using AISGen and the OE
>>> generated u-boot image before flashing it in the UBL partition
>>> (beginning of the second erase block) ?
>
> Not that I know of. I flashed uboot using tftp and that seemed to work
> fine. That was on a prototype hawkboard which has released it magic
> smoke since then.

Ok then I assume you had a pre-installed working UBL (User Boot Loader) 
in NAND @ Block 1 (0-indexed), that would initialize the board HW (EMIFA 
timings, SDRAM refresh cycles, etc) load block 2 in memory (U-Boot)and 
executes it. Then you could just overwrite the U-Boot NAND partition 
using U-Boot tftp and nand erase / write.e commands.

But AFAIU if you don't have an UBL (E.G. because you don't have a CCS 
license to modify/rebuild it) you can workaround it by using the AIS 
generator that generate a "self-bootable" image. In this case we want 
the OMAP-L138 RBL (ROM Bootloader) to read the AIS image from NAND (@ 
block 1, where the UBL is normally stored) configure the HW and start 
executing U-Boot.

Does this tell you anything ?

Regards,

Christophe

>
> regards,
>
> Koen
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