From: York Sun <yorksun@freescale.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] How do ARM platform initialize DDR?
Date: Tue, 17 Sep 2013 09:41:19 -0700 [thread overview]
Message-ID: <5238862F.3050500@freescale.com> (raw)
In-Reply-To: <CAPUj1ONwLH+m_q1mBxvPB=tKii2W8NYEBXf+pVrvrUNEr6K2AA@mail.gmail.com>
Dear MJ,
Thanks for your reply.
I don't see the file in my copy. Probably it is not merged yet?
Anyway, you just confirmed what I found so far. Do you use static
setting in dmc_init_ddr3.c? I mean does it adapt to different DDR speeds
and modules (if applicable)?
In my mind, I am thinking to restructure arch/powerpc/cpu/mpc8xxx/ddr/
to driver/ddr/fsl/ so the same driver can be shared as far as the DDR IP
is the same (or similar).
York
On 09/17/2013 09:34 AM, MJ embd wrote:
> Hi York,
>
> There is no generic driver. AFAIK. Having worked on both mpc85xx and ARM
>
> I can tell you about samsung 5250. There are 2 uboots (one spl and other main).
> In case of sd/mmc boot the internal rom copies the spl uboot to iRAM
> and the spl boot loader initialises the DDR3.
>
> you can check for board/samsung/smdk5250/dmc_init_ddr3.c
>
> -Regards
> mj
>
> On 9/17/13, York Sun <yorksun@freescale.com> wrote:
>> Albert,
>>
>> Pardon me if this is a dumb question. I have been working on powerpc
>> platforms in the past. Now we (the developers I work with) are exploring
>> ARM cores. I am searching how memory is initialized and found different
>> solutions. Some platforms have memory ready before u-boot even starts,
>> some simply write to a set of registers. I understand many platforms
>> don't share the IP of DDR controller. I am wondering if there is generic
>> DDR driver used by many ARM platforms, like the one we have for
>> powerpc/mpc85xx SoCs.
>>
>> Regards,
>>
>> York
>>
>> _______________________________________________
>> U-Boot mailing list
>> U-Boot at lists.denx.de
>> http://lists.denx.de/mailman/listinfo/u-boot
>>
>
>
next prev parent reply other threads:[~2013-09-17 16:41 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-17 15:59 [U-Boot] How do ARM platform initialize DDR? York Sun
2013-09-17 16:34 ` MJ embd
2013-09-17 16:41 ` York Sun [this message]
2013-09-17 17:07 ` MJ embd
2013-09-18 4:23 ` Sharma Bhupesh-B45370
2013-09-19 20:57 ` Tom Rini
2013-09-19 21:08 ` York Sun
2013-09-19 21:33 ` Tom Rini
2013-09-19 21:49 ` York Sun
2013-09-20 7:13 ` Mj Embd
2013-09-19 21:39 ` Wolfgang Denk
2013-09-19 21:48 ` York Sun
2013-09-25 23:30 ` [U-Boot] When to create a SoC directory for ARM York Sun
2013-09-25 23:52 ` Scott Wood
2013-09-26 1:04 ` sun york-R58495
2013-09-26 1:10 ` Scott Wood
2013-09-26 9:58 ` Wolfgang Denk
2013-09-22 13:02 ` [U-Boot] How do ARM platform initialize DDR? Timur Tabi
2013-09-22 13:00 ` Timur Tabi
2013-09-22 13:50 ` Wolfgang Denk
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