On Mon, 9 Mar 2009, Tony Lindgren wrote:
> * Juha Yrjola <juha.yrjola@xxxxxxxxxxxxx> [090308 10:20]:
> > The reboot mode can be communicated to a bootloader (or the
> > kernel itself) with a scratchpad register. This functionality
> > is especially useful, if userspace is allowed to change
> > the reboot mode.
> >
> > Signed-off-by: Juha Yrjola <juha.yrjola@xxxxxxxxxxxxx>
> > ---
> > arch/arm/mach-omap2/prcm.c | 10 ++++++++--
> > 1 files changed, 8 insertions(+), 2 deletions(-)
> >
> > diff --git a/arch/arm/mach-omap2/prcm.c b/arch/arm/mach-omap2/prcm.c
> > index f945156..2bd239e 100644
> > --- a/arch/arm/mach-omap2/prcm.c
> > +++ b/arch/arm/mach-omap2/prcm.c
> > @@ -43,9 +43,15 @@ void omap_prcm_arch_reset(char mode)
> >
> > if (cpu_is_omap24xx())
> > prcm_offs = WKUP_MOD;
> > - else if (cpu_is_omap34xx())
> > + else if (cpu_is_omap34xx()) {
> > + u32 l;
> > +
> > prcm_offs = OMAP3430_GR_MOD;
> > - else
> > + l = ('B' << 24) | ('M' << 16) | mode;
> > + /* Reserve the first word in scratchpad for communicating
> > + * with the boot ROM. */
> > + omap_writel(l, OMAP343X_SCRATCHPAD + 4);
> > + } else
> > WARN_ON(1);
> >
> > prm_set_mod_reg_bits(OMAP_RST_DPLL3, prcm_offs, RM_RSTCTRL);
>
> Looks OK to me, any comments from Kevin or Paul?
Can't find "BMxx" in the Rev O 34xx TRM. Is this a NOLO-specific feature,
or is this a known standard supported by other bootloaders? If the
former, maybe it would be good to add a few lines of documentation in
Documentation/arm/OMAP/rebooting or some other place?
- Paul
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