82845GV DDR SDRAM initialization

[Jia Jianwei]

I'm now working on linux bios with 82845gv/82801db chipset. When I initialize DDR RAM, It's always hangs. When I enable NOP command and issue a memory read instruction, It hangs.  Anyone can tell me if I missed something? Any advice would be appreciated.

Best Regards,
Jianwei

[ron minnich]

On Mon, 19 Jan 2004, Jia Jianwei wrote:
>  I'm now working on linux bios with 82845gv/82801db chipset. When I
>
> initialize DDR RAM, It's always hangs. When I enable NOP command and
> issue a memory read instruction, It hangs.  Anyone can tell me if I
> missed something? Any advice would be appreciated.

This is always the hard part. Unfortunately, you are going to have to 
debug and debug until you get it.

Are you using V1 or V2?

ron

[Jia Jianwei]

Thank you very much!
I'm using V1 and have changed a lot to fit our own need.

Jianwei

----- Original Message ----- 
From: "ron minnich" 
To: "Jia Jianwei" 
Cc: 
Sent: Monday, January 19, 2004 1:55 PM
Subject: Re: 82845GV DDR SDRAM initialization
> On Mon, 19 Jan 2004, Jia Jianwei wrote:
> >  I'm now working on linux bios with 82845gv/82801db chipset. When I
> >
> > initialize DDR RAM, It's always hangs. When I enable NOP command and
> > issue a memory read instruction, It hangs.  Anyone can tell me if I
> > missed something? Any advice would be appreciated.
>
> This is always the hard part. Unfortunately, you are going to have to 
> debug and debug until you get it.
>
> Are you using V1 or V2?
>
> ron

[ron minnich]

On Mon, 19 Jan 2004, Jia Jianwei wrote:
> Thank you very much!
> I'm using V1 and have changed a lot to fit our own need.

now you are worrying me ... :-)

what are you changing? If possible we'd like to merge 845 support back 
into the tree.

ron

[Jia Jianwei]

The source tree is changed but very similar,  As you know, many boards have
the same chipset, but have different superio and pci devices. And we also
merged some ethernet drivers and file system so that we can download from a
TFTP server in very early stage. If I can finish the BIOS on this board, Of
course I'll contribute some general code to freebios so that more developers
can benifit from it.

Jianwei

----- Original Message ----- 
From: "ron minnich" 
To: "Jia Jianwei" 
Cc: 
Sent: Monday, January 19, 2004 2:29 PM
Subject: Re: 82845GV DDR SDRAM initialization
> On Mon, 19 Jan 2004, Jia Jianwei wrote:
> > Thank you very much!
> > I'm using V1 and have changed a lot to fit our own need.
>
> now you are worrying me ... :-)
>
> what are you changing? If possible we'd like to merge 845 support back
> into the tree.
>
> ron