auto-loading omap3-isp

auto-loading omap3-isp

[Michael Jones]

I am trying to get omap3-isp.ko to be loaded upon bootup.  The problem
is that iommu2.ko needs to be loaded first, which can't just be compiled
into the kernel.  Udev will see '/sys/devices/platform/omap3isp' and
load omap3-isp.ko, which fails because iommu2.ko hasn't been loaded yet.
 iommu2 doesn't have a counterpart in /sys/devices/, so I don't know how
to get udev to load it first.

I can think of a few ways to accomplish this, but they all amount to
hacking the init sequence (e.g. the udev init script).  I'm looking for
a better way.

How are others doing this?

-Michael

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Re: auto-loading omap3-isp

[Laurent Pinchart]

Hi Michael,

On Wednesday 29 June 2011 16:30:48 Michael Jones wrote:
> I am trying to get omap3-isp.ko to be loaded upon bootup.  The problem
> is that iommu2.ko needs to be loaded first, which can't just be compiled
> into the kernel.  Udev will see '/sys/devices/platform/omap3isp' and
> load omap3-isp.ko, which fails because iommu2.ko hasn't been loaded yet.
>  iommu2 doesn't have a counterpart in /sys/devices/, so I don't know how
> to get udev to load it first.
> 
> I can think of a few ways to accomplish this, but they all amount to
> hacking the init sequence (e.g. the udev init script).  I'm looking for
> a better way.
> 
> How are others doing this?

I replace the tristate option by a bool option for the IOMMU config.

OMAP3 IOMMU support will move to the generic IOMMU API soon, so I'm not sure 
if it's worth fixing the problem it now.

-- 
Regards,

Laurent Pinchart