[U-Boot] [PATCH 05/10] board: altera: Stratix10: Add board_get_usable_ram_top()

[Westergreen, Dalon]

On Tue, 2019-03-12 at 11:46 +0100, Marek Vasut wrote:
> On 3/12/19 9:31 AM, Ley Foon Tan wrote:
> > Add board_get_usable_ram_top() function. Limit maximum usable
> > ram top to 2GB.
> 
> Why ? There are ARM64 platforms which can access the entire DRAM range
> just fine, what's the problem ?
> 

The issue is the gap in memory between 2GB and 4GB.  There is some trickery
you can use to gain access to the memory in that range, but in general, you
dont have access.  I believe just setting the banks up in the dts will
resolve this.

--dalon

> > Signed-off-by: Dalon Westergreen <dalon.westergreen at intel.com>
> > Signed-off-by: Ley Foon Tan <ley.foon.tan at intel.com>
> > ---
> >  board/altera/stratix10-socdk/socfpga.c | 12 ++++++++++++
> >  1 file changed, 12 insertions(+)
> > 
> > diff --git a/board/altera/stratix10-socdk/socfpga.c
> > b/board/altera/stratix10-socdk/socfpga.c
> > index 043fc543f1..99c10d313c 100644
> > --- a/board/altera/stratix10-socdk/socfpga.c
> > +++ b/board/altera/stratix10-socdk/socfpga.c
> > @@ -5,3 +5,15 @@
> >   */
> >  
> >  #include <common.h>
> > +#include <asm/arch/sdram.h>
> > +#include <linux/sizes.h>
> > +
> > +#ifdef CONFIG_ALTERA_SDRAM
> > +ulong board_get_usable_ram_top(ulong total_size)
> > +{
> > +	if (sdram_calculate_size() > SZ_2G)
> > +		return SZ_2G;
> > +	else
> > +		return sdram_calculate_size();
> > +}
> > +#endif
> > 
> 
> 
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