[U-Boot] [PATCH 5/5] Warn when the machine ID isn't passed to an ARM kernel and u-boot is compiled in debug mode. The kernel cannot boot without it.
Christopher Harvey
charvey at matrox.com
Mon Jul 4 20:55:54 CEST 2011
On Mon, Jul 04, 2011 at 02:08:44PM -0400, Jason wrote:
> On Mon, Jul 04, 2011 at 01:45:41PM -0400, Christopher Harvey wrote:
> > Signed-off-by: Christopher Harvey <charvey at matrox.com>
> > ---
> > arch/arm/lib/board.c | 4 ++++
> > arch/arm/lib/bootm.c | 6 ++++++
> > 2 files changed, 10 insertions(+), 0 deletions(-)
> >
> > diff --git a/arch/arm/lib/board.c b/arch/arm/lib/board.c
> > index 169dfeb..dbb835a 100644
> > --- a/arch/arm/lib/board.c
> > +++ b/arch/arm/lib/board.c
> > @@ -404,6 +404,10 @@ void board_init_f (ulong bootflag)
> > post_bootmode_init();
> > post_run (NULL, POST_ROM | post_bootmode_get(0));
> > #endif
> > + /* 0xffffffff is used to mark is value as "unset".
>
> s/mark is/mark a/
Yes, what I meant was:
0xffffffff is used to mark a value as "unset".
>
> > + Hopefully there will never be this many machines.
> > + Can't use 0 since 0 is already used as a mach-type. */
> > + gd->bd->bi_arch_number = 0xffffffff;
> >
> > gd->bd->bi_baudrate = gd->baudrate;
> > /* Ram ist board specific, so move it to board code ... */
> > diff --git a/arch/arm/lib/bootm.c b/arch/arm/lib/bootm.c
> > index 802e833..70b3b76 100644
> > --- a/arch/arm/lib/bootm.c
> > +++ b/arch/arm/lib/bootm.c
> > @@ -113,6 +113,12 @@ int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
> > printf ("Using machid 0x%x from environment\n", machid);
> > }
> >
> > +#ifdef DEBUG
> > + if(machid==0xffffffff) {
> > + debug("\nWarning: machid not set! Linux will not finish booting.\n\n");
>
> s/finish/start/ ;-)
I'll have to disagree here. Linux will decompress and some functions
will run but it will eventually stop, hence will not finish.
>
> Also, shouldn't the compile fail in this case (#error)? Or, at least #warn?
The compiler can't know what machid will be at runtime. Maybe a "would
you like to continue?" prompt could work.
>
> > + }
> > +#endif
> > +
> > show_boot_progress (15);
> >
> > #ifdef CONFIG_OF_LIBFDT
> > --
> > 1.7.3.4
>
> Please take comments with a grain of salt, I'm asking, not telling. I'm
> fairly new to this as well.
I'm happy to clarify.
>
> thx,
>
> Jason.
thanks,
-Chris
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