[U-Boot] esdmode for DDR2

[Werner Nedel]

Sorry for this big mistake and wasting your time :-(

There's a bit between rtt and ocd, that don't match with definition in jedec
ddr2 sdram specification.
On Sat, Oct 24, 2009 at 12:38 PM, Kumar Gala <galak at kernel.crashing.org>wrote:

> 5 is correct.
>
> Here's an example:
>
> rtt = 0x3:
> esd_mode should be = 0x44:
>
>        esdmode = (0
>                | ((rtt & 0x4) << 7)   /* rtt field is split */
>                | ((rtt & 0x2) << 5)   /* rtt field is split */
>                | ((rtt & 0x1) << 2)  /* rtt field is split */
>                );
>
>        esdmode = (0
>                | ((0x3 & 0x4) << 7)   /* rtt field is split */
>                | ((0x3 & 0x2) << 5)   /* rtt field is split */
>                | ((0x3 & 0x1) << 2)  /* rtt field is split */
>                );
>
>        esdmode = (0
>                | ((0) << 7)   /* rtt field is split */
>                | ((0x2) << 5)   /* rtt field is split */
>                | ((0x1) << 2)  /* rtt field is split */
>                );
>
>        esdmode = (0
>                | (0x40)   /* rtt field is split */
>                | (0x4)  /* rtt field is split */
>                );
>
>        esdmode = (0x44);
>
> - k
>
>
>
> On Oct 22, 2009, at 9:53 AM, Werner Nedel wrote:
>
>  Sorry again,
>>
>> and with DDR2.
>>
>> On Thu, Oct 22, 2009 at 11:42 AM, Werner Nedel <wmnedel at gmail.com> wrote:
>>
>>  Hi,
>>>
>>> sorry about that. I'm working on a MPC8548 platform and using the mpc8xxx
>>> common code for DDR configuration.
>>>
>>>
>>> On Thu, Oct 22, 2009 at 11:36 AM, Kumar Gala <galak at kernel.crashing.org
>>> >wrote:
>>>
>>>
>>>> On Oct 22, 2009, at 6:48 AM, Werner Nedel wrote:
>>>>
>>>> Hi,
>>>>
>>>>>
>>>>> I was looking the ctrl_regs.c file at the last release of u-boot,
>>>>> specifically at sdram_mode register, and checking at AN3369.pdf I think
>>>>> that
>>>>> Rtt bit position might be wrong. At the code, the bit shifting is 5,
>>>>> but
>>>>> shouldn't be 6? I think that it overwrites AL register.
>>>>>
>>>>>
>>>> Can you be more specific about what arch/platform you are taking about.
>>>>
>>>> - k
>>>>
>>>>
>>>
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>
>