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

[Ley Foon Tan]

On Tue, Mar 12, 2019 at 10:40 PM Marek Vasut <marex at denx.de> wrote:
>
> On 3/12/19 3:33 PM, Westergreen, Dalon wrote:
> > 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.
>
> E.g. the R8A779{5..9}* platforms also have gaps in memory and it all
> works fine . So unless there's some other specialty, there should be no
> problem.
>
Yes, we don't need this.

Regards
Ley Foon