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Date: Mon, 06 Oct 2008 15:22:47 +0200
From: Philippe Gerum <rpm@xenomai.org>
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Subject: Re: [Xenomai-help] Error while building Xenomai on Powerpc
 with	instrument function entries enabled
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To: Giammarco Zacheo <g.zacheo@domain.hid>
Cc: xenomai-help <xenomai@xenomai.org>

Giammarco Zacheo wrote:
> I can confirm that with vmalloc'ed buffers it hangs anyhow.
>

The issue you face is typical from the internal mcount() call referring to
unmapped memory in early boot code. Some routine there lacks a "notrace"
specifier. Finding it will require some work.

> Giammarco
> 
> On Fri, Oct 3, 2008 at 8:29 PM, Giammarco Zacheo <g.zacheo@domain.hid
> <mailto:g.zacheo@domain.hid>> wrote:
> 
>     I'm quite sure it was enabled. I will confirm it on Monday.
> 
>     Giammarco
> 
> 
>     On Fri, Oct 3, 2008 at 8:19 PM, Gilles Chanteperdrix
>     <gilles.chanteperdrix@xenomai.org
>     <mailto:gilles.chanteperdrix@xenomai.org>> wrote:
> 
>         Giammarco Zacheo wrote:
>         > I was wrong. I am able to compile the kernel, but it hangs
>         very early,
>         > giving this output:
>         >
>         > zImage starting: loaded at 0x00400000 (sp: 0x017ffe50)
>         > Allocating 0x590acc bytes for kernel ...
>         > OF version = 'EFIKA5K2,1.3'
>         > gunzipping (0x01800000 <- 0x00407000:0x00619b3b)...done
>         0x4cd39c bytes
>         >
>         > Linux/PowerPC load: root=/dev/nfs rw
>         nfsroot=192.168.10.122:/opt/eldk/ppc_6xx
>         > ip=dhcp console=ttyPSC0
>         > Finalizing device tree... using OF tree (promptr=01003ed8)
>         > cpu_exception:
>         > SRR0 0x0180B338 SRR1  0x00043030 MSR  0x00003030
>         > LR   0x01C704B4 CTR   0x01800000 CR   0x42002042   XER 0x0
>         > DAR  0x00000000 DSISR 0x00000000 Type 2
>         > GPR[] 0x40000000 0x017FFE20 0x00000000 0x41820014 0x01C704B4
>         0x42002042
>         > 0xC04D0000 0x017FFD90
>         > GPR[] 0x00000001 0x00625C04 0x07C00008 0x07C00008 0x42002044
>         0x1004A33C
>         > 0x01C647A0 0x017FFC2C
>         > GPR[] 0x01BDCA4C 0x01BDCA6C 0x01BF66C4 0x01BDCA78 0x08000000
>         0x01BDCA10
>         > 0xFFFFFFFF 0x07C53FC8
>         > GPR[] 0x01800000 0x00590ACC 0x07C548A8 0x00000000 0x00000000
>         0x004062C8
>         > 0x0040E134 0x00000000
>         > ibat0U 0x00001FFF ibat0L 0x00000012
>         > ibat1U 0xF0001FFF ibat1L 0xF0000012
>         > ibat2U 0x00000000 ibat2L 0x00000000
>         > ibat3U 0x00000000 ibat3L 0x00000000
>         > dbat0U 0xF0001FFF dbat0L 0xF000002A
>         > dbat1U 0x80001FFF dbat1L 0x8000002A
>         > dbat2U 0x00001FFF dbat2L 0x00000012
>         > dbat3U 0xC0001FFF dbat3L 0xC000002A
>         > HID0 0x0000C000
>         > deadend:
>         >
>         > Any hint about?
> 
>         Did you try using vmalloc for the tracer logs ?
> 
> 
>         --
>                                                    Gilles.
> 
> 
> 
> 
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-- 
Philippe.