Re: OMAP TV video

[Imre Deak <imre.deak@nokia.com>]

On Wed, Feb 04, 2009 at 03:57:37PM +0100, ext Gary Thomas wrote:
> Note: if this is the wrong list, or if there's a better place
> to ask these questions, please redirect me.
> 
> I have an OMAP/Zoom1 (3430 LDP).  I'm trying to use the
> S-Video output, without much success.  Today, I grabbed
> the latest tree (as least from what I can gather from various
> web pages) from git://git.omapzoom.org/repo/omapkernel.git
> 
> When I try to use the TV, the kernel crashes immediately:
> Unhandled fault: external abort on non-linefetch (0x1008) at 0xd8050440

I'm guessing that the external abort is caused by the DSS interface
clock being disabled.

--Imre

> Internal error: : 1008 [#1]
> Modules linked in:
> 
> CPU: 0    Not tainted  (2.6.27.10-omap1-00181-gc9fd795 #1)
> PC is at omap2_disp_enable_output_dev+0x30/0x44
> LR is at write_layer_out+0x118/0x220
> pc : [<c0053a84>]    lr : [<c018f3d4>]    psr: 60000013
> sp : c7963ec8  ip : c7963ed8  fp : c7963ed4
> r10: c7963f70  r9 : c7940e78  r8 : c039c8f0
> r7 : 00000000  r6 : 00000003  r5 : c78626f8  r4 : c03c3c44
> r3 : 00000000  r2 : d8050000  r1 : 00000003  r0 : 00000005
> Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
> Control: 00c5387f  Table: 87320018  DAC: 00000015
> Process echo (pid: 723, stack limit = 0xc79622e0)
> 
> kernel version: Linux version 2.6.27.10-omap1-00181-gc9fd795
> config: omap_ldp_defconfig
> 
> Notes:
> * An older kernel (circa 2008-12-01) does not crash.  The
>   TV output is not correct, but at least it doesn't crash.
> * How can I turn off the double printk()?  All kernel messages
>   get duplicated and it makes it terribly hard to use.  e.g.
> 
>     <5>Looking up port of RPC 100003/2 on 192.168.1.100
>     Looking up port of RPC 100003/2 on 192.168.1.100
>     <5>Looking up port of RPC 100005/1 on 192.168.1.100
>     Looking up port of RPC 100005/1 on 192.168.1.100
>     VFS: Mounted root (nfs filesystem).
>     VFS: Mounted root (nfs filesystem).
> 
>   Other kernels (PowerPC, etc) don't suffer from this.
> * This kernel version is very unstable - it simply quits after
>   just a few moments of running.  I didn't see this with the
>   older kernel.
> 
> Thanks for any ideas/pointers
> 
> --
> ------------------------------------------------------------
> Gary Thomas                 |  Consulting for the
> MLB Associates              |    Embedded world
> ------------------------------------------------------------
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