RE: [PATCH v2] ARM: exynos: add debug_ll_io_init() call inexynos_init_io()

From: Kukjin Kim
Date: Wed Jun 05 2013 - 19:32:14 EST

Olof Johansson wrote:
> On Wed, Jun 5, 2013 at 1:56 PM, Doug Anderson <dianders@xxxxxxxxxxxx>
> wrote:
> > If the early MMU mapping of the UART happens to get booted out of the
> > TLB between the start of paging_init() and when we finally re-add the
> > UART at the very end of s3c_init_cpu(), we'll get a hang at bootup if
> > we've got early_printk enabled. Avoid this hang by calling
> > debug_ll_io_init() early.
> >
> > Without this patch, you can reliably reproduce a hang when early
> > printk is enabled by adding flush_tlb_all() at the start of
> > exynos_init_io(). After this patch the hang goes away.
> >
> > Signed-off-by: Doug Anderson <dianders@xxxxxxxxxxxx>
> Acked-by: Olof Johansson <olof@xxxxxxxxx>
> Kukjin, this seems appropriate for 3.10. Do you have other fixes
> queued or should I apply this directly?
If I remember correctly, nothing in my tree for 3.10.

So please go ahead with my ack if you want,

Acked-by: Kukjin Kim <>


- Kukjin

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