[PATCH 02/11] omap2/3: Fix DEBUG_LL for omap zoom2/3
Tony Lindgren
tony at atomide.com
Fri Apr 30 17:02:17 EDT 2010
* Kevin Hilman <khilman at deeprootsystems.com> [100430 13:50]:
> Tony Lindgren <tony at atomide.com> writes:
>
> > Zoom2 and 3 have UARTs only on the external debug board.
> > GPMC needs to be mapped early to use it for DEBUG_LL.
> >
> > Additionally, 0xfb000000 overlaps with other areas, so
> > use 0xfa400000 for the virtual address instead.
> >
> > Note that with the pending serial.c patches you need to
> > set console=ttyS0,115200n8 as it will be the only UART
> > mapped. To use DEBUG_LL, you need to pass also earlyprintk
> > in cmdline.
> >
> > Cc: Allen Pais <allen.pais at ti.com>
> > Cc: Vikram Pandita <vikram.pandita at ti.com>
> > Signed-off-by: Tony Lindgren <tony at atomide.com>
> > ---
> > arch/arm/kernel/head.S | 10 ++++++++++
> > arch/arm/mach-omap2/board-zoom-debugboard.c | 2 +-
> > arch/arm/mach-omap2/include/mach/debug-macro.S | 4 ++--
> > arch/arm/mach-omap2/io.c | 9 +++++++++
> > arch/arm/plat-omap/include/plat/serial.h | 2 +-
> > 5 files changed, 23 insertions(+), 4 deletions(-)
> >
> > diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
> > index eb62bf9..fd870e1 100644
> > --- a/arch/arm/kernel/head.S
> > +++ b/arch/arm/kernel/head.S
> > @@ -328,6 +328,16 @@ __create_page_tables:
> > add r0, r4, #0xd8000000 >> 18
> > str r3, [r0]
> > #endif
> > +#if defined(CONFIG_MACH_OMAP_ZOOM2) || defined(CONFIG_MACH_OMAP_ZOOM3)
> > + /*
> > + * Zoom2 and Zoom3 have UARTs only on the debug board.
> > + * The debug board is connected to the GPMC.
> > + */
> > + add r0, r4, #0xfa000000 >> 18
> > + orr r0, r0, #0x00400000 >> 18 @ ZOOM_UART_VIRT
> > + orr r3, r7, #0x10000000 @ ZOOM_UART_BASE
> > + str r3, [r0]
> > +#endif
>
> I don't see why this part is needed. The same mapping is done using
> the .io_pg_offset in the machine description which is done just before
> this in head.S
That mapping does not cover the GPMC area where this UART is.
Tony
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