Ram problem

[steven james]

Greetings,

I'm trying to get ram working on an e7500 MCH.
It seems to be actually initting, but when I run ramtest it, I
consistantly see a single bit toggled when reading back such as:

00024ab4:00024a94                                                               
00024abc:00024a9c                                                               
00024ad4:00024af4                                                               
00024adc:00024afc                                                               
00024af4:00024ad4                                                               
00024afc:00024adc                                                               
00024b14:00024b34                                                               
00024b1c:00024b3c                                                               
00024b34:00024b14                                                               
00024b3c:00024b1c                                                               
00024b54:00024b74                                                               
00024b5c:00024b7c                                                               
00024b74:00024b54                                                               
00024b7c:00024b5c                                                               
00024b94:00024bb4                                                               
00024b9c:00024bbc                                                               
00024bb4:00024b94                                                               
00024bbc:00024b9c                                                               
00024bd4:00024bf4                                                               
00024bdc:00024bfc

Other times, I see that the second read (in order to display the bad
value) actually reads successfully such as 000127a8:000127a8

Does anyone have any ideas what might cause that?

G'day,
sjames

[Eric W Biederman]

steven james  writes:
> Greetings,
>
> I'm trying to get ram working on an e7500 MCH.
> It seems to be actually initting, but when I run ramtest it, I
> consistantly see a single bit toggled when reading back such as:
> Other times, I see that the second read (in order to display the bad
> value) actually reads successfully such as 000127a8:000127a8

Hmm.  it sounds very much like you are missing something.
When I finally finally got the ram intialization sequence working the
ram was rock solid.

Is this known good ram?
> Does anyone have any ideas what might cause that?

There are too many variables for me to have a good guess.  I am just
about to sync my tree with the sourceforge tree and you can compare
notes.

Eric

[steven james]

Greetings,

I think I've got it now. It passes mem tests, and boots.
I will look forward to comparing just to see...

G'day,
sjames

On 8 Oct 2002, Eric W Biederman wrote:
> steven james  writes:
> > Greetings,
> >
> > I'm trying to get ram working on an e7500 MCH.
> > It seems to be actually initting, but when I run ramtest it, I
> > consistantly see a single bit toggled when reading back such as:
> > Other times, I see that the second read (in order to display the bad
> > value) actually reads successfully such as 000127a8:000127a8
>
> Hmm.  it sounds very much like you are missing something.
> When I finally finally got the ram intialization sequence working the
> ram was rock solid.
>
> Is this known good ram?
> > Does anyone have any ideas what might cause that?
>
> There are too many variables for me to have a good guess.  I am just
> about to sync my tree with the sourceforge tree and you can compare
> notes.
>
> Eric
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