Bug#658759: disable l2 cache on kirkwood devices (workaround #658904)
On Mon, 2012-09-10 at 23:09 -0700, Jonathan Nieder wrote:
> Hi Ian,
> On Aug 30, 2012, Ian Campbell wrote:
> > I've just tried injecting the following onto the head of the zImage (in
> > a similar manner to flash-kernel's set_machine_id function):
> > This works around the issue on my dreamplug (this is effectively the
> > same code sequence as what the u-boot fix does).
> > I can see two ways of distributing this fix. Either a kernel patch gated
> > on CONFIG_ARCH_KIRKWOOD to some early bit of code or use devio in
> > flash-kernel + the installer build.
> Sorry I missed this before. That sounds like an excellent idea for a
> kernel patch. A kind user on the linux-arm-kernel@ list recently
> mentioned he'd be willing to test patches, if you need a guinea pig,
> and I assume once a patch is written and tested it should be possible
> to get useful feedback from the list.
My main concern with doing this on the kernel side is that it will
eventually fall foul of the attempts to reduce everything to a single
kernel image, since the code will necessarily be quite kirkwood specific
and run very early on.
Martin's testing of di on ARM suggests this issue isn't all that
widespread, which lead me to conclude that the risk of making a change
like this (either in the kernel or the installer/flash-kernel) for
Wheezy was not worth the chance of breaking some other kirkwood device.
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