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From: Westergreen, Dalon <dalon.westergreen@intel.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH 05/10] board: altera: Stratix10: Add board_get_usable_ram_top()
Date: Tue, 12 Mar 2019 14:33:18 +0000	[thread overview]
Message-ID: <cc50444b1ecef373394dc435766669cdfc38c1b5.camel@intel.com> (raw)
In-Reply-To: <d500af7c-d8b4-b24b-b825-02cfcd80cff9@denx.de>

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@intel.com>
> > Signed-off-by: Ley Foon Tan <ley.foon.tan@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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  reply	other threads:[~2019-03-12 14:33 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-12  8:31 [U-Boot] [PATCH 00/10] Update Stratix 10 SDRAM driver Ley Foon Tan
2019-03-12  8:31 ` [U-Boot] [PATCH 01/10] ddr: altera: stratix10: Move SDRAM size check to " Ley Foon Tan
2019-03-12 10:41   ` Marek Vasut
2019-03-19  3:26     ` Ley Foon Tan
2019-03-19  8:55       ` Marek Vasut
2019-03-19  9:46         ` Ley Foon Tan
2019-03-19  9:47           ` Marek Vasut
2019-03-20  1:30             ` Ley Foon Tan
2019-03-20  9:41               ` Marek Vasut
2019-03-21  5:59                 ` Ley Foon Tan
2019-03-12  8:31 ` [U-Boot] [PATCH 02/10] arm: socfpga: Add sdram_s10.h to sdram.h Ley Foon Tan
2019-03-12  8:31 ` [U-Boot] [PATCH 03/10] ddr: altera: s10: Add multiple memory banks support Ley Foon Tan
2019-03-12 10:44   ` Marek Vasut
2019-03-12 14:05     ` Westergreen, Dalon
2019-03-13  7:28       ` Ley Foon Tan
2019-03-13  9:14         ` Marek Vasut
2019-03-12  8:31 ` [U-Boot] [PATCH 04/10] arm: socfpga: Update dram_init_banksize() for Stratix10 Ley Foon Tan
2019-03-12 10:45   ` Marek Vasut
2019-03-12 14:25     ` Westergreen, Dalon
2019-03-12  8:31 ` [U-Boot] [PATCH 05/10] board: altera: Stratix10: Add board_get_usable_ram_top() Ley Foon Tan
2019-03-12 10:46   ` Marek Vasut
2019-03-12 14:33     ` Westergreen, Dalon [this message]
2019-03-12 14:40       ` Marek Vasut
2019-03-19  3:27         ` Ley Foon Tan
2019-03-12  8:31 ` [U-Boot] [PATCH 06/10] board: altera: Stratix10: Add ft_board_setup() Ley Foon Tan
2019-03-12 10:47   ` Marek Vasut
2019-03-19  3:28     ` Ley Foon Tan
2019-03-12  8:31 ` [U-Boot] [PATCH 07/10] arm: socfpga: Enable OF_BOARD_SETUP for Stratix 10 Ley Foon Tan
2019-03-12  8:31 ` [U-Boot] [PATCH 08/10] configs: stratix10: Change CONFIG_NR_DRAM_BANKS to 2 Ley Foon Tan
2019-03-12  8:31 ` [U-Boot] [PATCH 09/10] arm: socfpga: stratix10: Add cpu_has_been_warmreset() Ley Foon Tan
2019-03-12  8:31 ` [U-Boot] [PATCH 10/10] ddr: altera: Stratix10: Add ECC memory scrubbing Ley Foon Tan
2019-03-12 10:49   ` Marek Vasut
2019-03-19  3:14     ` Ley Foon Tan
2019-03-19  8:57       ` Marek Vasut
2019-03-19  9:49         ` Ley Foon Tan
2019-03-19 12:20           ` Marek Vasut
2019-03-12 11:08 ` [U-Boot] [PATCH 00/10] Update Stratix 10 SDRAM driver Simon Goldschmidt
2019-03-13 18:17   ` Ley Foon Tan
2019-03-14  8:23     ` Simon Goldschmidt

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