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From: Ley Foon Tan <lftan.linux@gmail.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH 05/10] board: altera: Stratix10: Add board_get_usable_ram_top()
Date: Tue, 19 Mar 2019 11:27:18 +0800	[thread overview]
Message-ID: <CAFiDJ58m7fOPHbAYjUMaE_E4uir7QxFFBDtyx02LXP8zTKNH_A@mail.gmail.com> (raw)
In-Reply-To: <887331a8-0b3c-4363-8a5f-363355edb80d@denx.de>

On Tue, Mar 12, 2019 at 10:40 PM Marek Vasut <marex@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

  reply	other threads:[~2019-03-19  3:27 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
2019-03-12 14:40       ` Marek Vasut
2019-03-19  3:27         ` Ley Foon Tan [this message]
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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