[LinuxBIOS] smbus_write_byte???

[Joseph Smith]

Anyone know if there is a function to write to the smbus similar to  
the smbus_read_byte function? Execpt write not read of course, like  
smbus_write_byte?

Thanks - Joe

[Corey Osgood]

Joseph Smith wrote:
> Anyone know if there is a function to write to the smbus similar to  
> the smbus_read_byte function? Execpt write not read of course, like  
> smbus_write_byte?
>
> Thanks - Joe

For i82801xx, it's already implemented, just totally untested. I have no
idea who wrote it, and I make no claim of it actually working (although
it very well could).  Have a look at i82801xx_smbus.h, that's where all
the smbus functions really live, you're looking for do_smbus_write_byte.
It's commented out atm, my own decision since I was unsure of it with no
real way to test.

-Corey

[LinuxBIOS] smbus_write_byte

[Joseph Smith]

Quoting Corey Osgood :
> Joseph Smith wrote:
> > Anyone know if there is a function to write to the smbus similar to
> > the smbus_read_byte function? Execpt write not read of course, like
> > smbus_write_byte?
> >
> > Thanks - Joe
>
> For i82801xx, it's already implemented, just totally untested. I have no
> idea who wrote it, and I make no claim of it actually working (although
> it very well could).  Have a look at i82801xx_smbus.h, that's where all
> the smbus functions really live, you're looking for do_smbus_write_byte.
> It's commented out atm, my own decision since I was unsure of it with no
> real way to test.
>
> -Corey

Hmm, Looks like in i82801xx_early_smbus.c (which is what I need for auto.c)
there is smbus_write_byte, and smbus_write_block. The function is  
defined in i82801xx_smbus.h. I really need to get this going. Because  
my onboard memory has no SPD I need to write to smbus 0x51 to trick  
the system into thinking there is SPD there. Any suggestions on what  
is wrong with it??

Thanks - Joe

[LinuxBIOS] smbus_write_byte

[yhlu]

just provide one fake spd array...

YH

[LinuxBIOS] smbus_write_byte

[Corey Osgood]

yhlu wrote:
> just provide one fake spd array...
>
> YH

My thoughts exactly. You can't write to the smbus because there's no
device on the smbus at that location to receive those writes.

-Corey

[LinuxBIOS] smbus_write_byte

[Joseph Smith]

Quoting Corey Osgood :
> yhlu wrote:
> > just provide one fake spd array...
> >
> > YH
>
> My thoughts exactly. You can't write to the smbus because there's no
> device on the smbus at that location to receive those writes.
>
> -Corey

How would I provide a fake spd array? Here is the situation. My board  
has the onboard memory without a SPD, I could just hardcode this into  
the northbridge raminit.c. But I don't want to do that so people that  
may want to use the northbridge src for other boards won't have to  
deal with it. So right now I have auto.c call a function that runs in  
between sdram_set_spd_registers and sdram_enable, like this:

sdram_set_spd_registers(memctrl);
    onboard_sdram_set_registers(memctrl);
    sdram_enable(0, memctrl);

This function, onboard_sdram_set_registers manually sets up the regsters.

Anyways I would also like to get the smbus_write_byte write going to  
setup my tv-out registers on my tv-out chip?

Thanks - Joe

[LinuxBIOS] smbus_write_byte

[yhlu]

On 8/18/07, Joseph Smith  wrote:
> How would I provide a fake spd array? Here is the situation. My board
> has the onboard memory without a SPD, I could just hardcode this into
> the northbridge raminit.c. But I don't want to do that so people that
> may want to use the northbridge src for other boards won't have to
> deal with it. So right now I have auto.c call a function that runs in
> between sdram_set_spd_registers and sdram_enable, like this:
>     sdram_set_spd_registers(memctrl);
>     onboard_sdram_set_registers(memctrl);
>     sdram_enable(0, memctrl);
>
> This function, onboard_sdram_set_registers manually sets up the regsters.
>
> Anyways I would also like to get the smbus_write_byte write going to
> setup my tv-out registers on my tv-out chip?

rename these function to different name _*. and add functions that
will handle SPD address with handling the array. and other address
still call _*.

YH

[LinuxBIOS] smbus_write_byte

[Marc Jones]

Joseph Smith wrote:
> Quoting Corey Osgood :
> > yhlu wrote:
> > > just provide one fake spd array...
> > >
> > > YH
> >
> > My thoughts exactly. You can't write to the smbus because there's no
> > device on the smbus at that location to receive those writes.
> >
> > -Corey
>
> How would I provide a fake spd array? Here is the situation. My board  
> has the onboard memory without a SPD, I could just hardcode this into  
> the northbridge raminit.c. But I don't want to do that so people that  
> may want to use the northbridge src for other boards won't have to  
> deal with it. So right now I have auto.c call a function that runs in  
> between sdram_set_spd_registers and sdram_enable, like this:
>
> sdram_set_spd_registers(memctrl);
>    onboard_sdram_set_registers(memctrl);
>    sdram_enable(0, memctrl);
>
> This function, onboard_sdram_set_registers manually sets up the regsters.
>
> Anyways I would also like to get the smbus_write_byte write going to  
> setup my tv-out registers on my tv-out chip?
>
> Thanks - Joe

Joe,
There is an example of an spd array in 
mainboard/artecgroup/dbe61/cache_as_ram_auto.c spd_read_byte(). You will 
have to generate the correct SPD values for your memory.

Is the normal smbus_write_byte not working?

Marc