Re: [Xenomai] Upgrading to Xenomai 2.6.1

[Doug Brunner <dbrunner@ebus.com>]

On 09/02/2012 10:28 PM, Gilles Chanteperdrix wrote:
> On 09/03/2012 01:48 AM, Doug Brunner wrote:
>
>> On 08/31/2012 12:39 AM, Gilles Chanteperdrix wrote:
>>> On 08/31/2012 08:40 AM, Doug Brunner wrote:
>>>
>>>> I've been having a very hard time with the upgrade from Xenomai 2.6.0 to
>>>> 2.6.1--hoping someone might have a suggestion for me. My thinking was
>>>> that, to get the most possible bug fixes, I should also upgrade to the
>>>> latest kernel for which there is a stable I-pipe patch, which appears to
>>>> be 3.2.21 from examining the list of available patches distributed with
>>>> Xenomai.
>>>>
>>>> Unfortunately, 3.2.21 (even unmodified, using a vanilla Debian kernel
>>>> config, set for 586 cpu type) will not boot on my target platform
>>>> (Winsystems PPM-LX800-G, which has a Geode LX800 CPU). It immediately
>>>> resets after "Loading initial ramdisk", without even any early printk
>>>> output. I have no idea what could be causing that :(
>>> Ok. I have just booted my geode with 3.4, both with 586 cpu type without
>>> tsc and with geode cpu type with tsc. The kernel boots and the latency
>>> test starts. So, I guess you selected a kernel configuration option we
>>> do not support (such as CONFIG_KGDB).
>>>
>>> You can download the configuration which works for me here:
>>> http://xenomai.org/~gch/config-geode
>>>
>> Argh...the problem was apparently that I'd left SMP support selected.
>> Thanks for your config! It's a nice bare-bones kernel and boots my Geode
>> as well so I'm using it as a new starting point.
>> I saw an email from you on 8/3 referring to a regression connected to
>> irq_hold that was fixed in your git. Should I get an I-pipe patch from
>> there, or from git.denx.de/ipipe.git instead of using the one
>> distributed with 2.6.1?
> Probably not, that is a fix for IO-APIC interrupt controller, the geode
> does not have an IO-APIC. Making a few tests with geode without tsc I
> found out something obvious: "statistics collection" should be disabled
> as it causes the tsc read function to be called often, and each read of
> the emulated tsc costs 4us.
If I understand you correctly you are recommending I use 3.2.21 with the 
ipipe patch supplied with Xeno 2.6.1 (changing ipipe_root_domain_p to 
ipipe_root_p in arch/x86/lib/mmx_32.c).

Unfortunately it seems neither that 3.2.21 nor the already ipipe-enabled 
3.4.6 from git.denx.de/ipipe.git 
(29e656a9501663366287a893d5f6d62bff9f40f6) works with my target 
Winsystems PPM-LX800-G. Whether I use the config you posted at 
http://xenomai.org/~gch/config-geode or mine (derived from yours, just 
drops some ethernet devices I don't use and adds the Geode framebuffer 
and IPv6), the system experiences ATA faults such as the following 
immediately upon trying to boot:

ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
ata1.00: failed command: READ DMA
ata1.00: cmd c8/00:08:00:00:00/00:00:00:00:00/e0 tag 0 dma 4096 in
          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
ata1.00: status: { DRDY }

Finally, after several of these with long delays in between, it panics 
because it can't find the root filesystem on the ATA device it's trying 
to access (CF card via the CS5536 controller).

The same config minus the ipipe stuff, fed to an unpatched kernel tree, 
produces a binary that will boot the system with no error messages; this 
is true for both 3.2.21 and 3.4.6. Any idea what could be doing this, or 
what else I can do to debug? I've attached my configs for reference, 
except the 3.4.6 ipipe which I forgot to save.

Thanks,
     --Doug Brunner
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