[U-Boot] [PATCH 4/4] microblaze: generic: enable FDT support

[Stephan Linz]

Am Dienstag, 22. Juni 2010 09:25:56 schrieb Michal Simek:
> Stephan Linz wrote:
> > Signed-off-by: Stephan Linz <linz at li-pro.net>
> > ---
> >  include/configs/microblaze-generic.h |    8 ++++++++
> >  1 files changed, 8 insertions(+), 0 deletions(-)
> >
> > diff --git a/include/configs/microblaze-generic.h
> > b/include/configs/microblaze-generic.h index 28cee47..89e6dbb 100644
> > --- a/include/configs/microblaze-generic.h
> > +++ b/include/configs/microblaze-generic.h
> > @@ -305,4 +305,12 @@
> >  #define CONFIG_SYS_PROMPT_HUSH_PS2 "> "
> >  #endif
> >
> > +/* pass open firmware flat tree */
> > +#define CONFIG_FIT		1
> > +#define CONFIG_OF_LIBFDT	1
> > +
>
> that's ok.
>
> > +/* Initial Memory map for Linux */
> > +#define CONFIG_SYS_BOOTMAPSZ	(8 << 20)
>
> Why is this value setup to 0x800000?

First of all the flat device tree handling depends on CONFIG_SYS_BOOTMAPSZ. So 
I have to define a valid value. As far as I understand the initial memory map 
for Linux there have to be space for the kernel (text+data), fdt_blob and 
kernel parameters (at least). I'm unsure with an embedded init ramdisk as 
produced by simpleImage. The simpleImage can quickly grow up over 6MB with 
embedded initrd.

So I borrowed this configuration (8MB) from most other configurations (mainly 
PowerPC).

br,
Stephan


>
> > +
> > +
>
> BTW: One black line is enough
>
> Thanks,
> Michal

-- 
Viele Grüße,
Stephan Linz
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