Re: [coreboot] Generic AMD E350 Support

[Peter Stuge]

Graeme Russ wrote:
> > > MX25L1606E
> >
> > MXIC yep. Solder something to it so that you can reprogram. Use the
>
> I was thinking of buying an 8 pin SOIP test clip

Yes, that of course works too.
> > VCC on the chip for programming. Hold the mainboard in reset while
> > you drive the SPI signals. I would check first that the chipset
> > doesn't sink too much current. (Ampmeter+2k2 resistor between VCC
> > and one signal at a time. The current should stay well under 1.5mA.)
>
> I have an in-circuit programmer I used on another board (which had a
> breakout header for the SPI flash). Do you think I could just use this
> with the board powered-down?

Unsure. You would then be powering one of the 3v3 rails (where the
flash chip is connected) from the programmer, without powering any
other rail on the board. The southbridge may not like it at all
when your programmer drives the SPI pins in that state.

//Peter

Generic AMD E350 Support

[Graeme Russ]

Hi Peter,

On Thu, Oct 18, 2012 at 10:10 AM, Peter Stuge  wrote:
> Graeme Russ wrote:
> > > > MX25L1606E
> > >
> > > MXIC yep. Solder something to it so that you can reprogram. Use the
> >
> > I was thinking of buying an 8 pin SOIP test clip
>
> Yes, that of course works too.
> > > VCC on the chip for programming. Hold the mainboard in reset while
> > > you drive the SPI signals. I would check first that the chipset
> > > doesn't sink too much current. (Ampmeter+2k2 resistor between VCC
> > > and one signal at a time. The current should stay well under 1.5mA.)
> >
> > I have an in-circuit programmer I used on another board (which had a
> > breakout header for the SPI flash). Do you think I could just use this
> > with the board powered-down?
>
> Unsure. You would then be powering one of the 3v3 rails (where the
> flash chip is connected) from the programmer, without powering any
> other rail on the board. The southbridge may not like it at all
> when your programmer drives the SPI pins in that state.

Hmmm, I wonder what the potential for permanent damage is?

So to be safe:
 - Jumper the front panel reset pins
 - Power-on the motherboard
 - Do a current test from VCC to each of the CS#, HOLD#, WP#, SCLK,
SI, and SO pins
 - Connect the programmer without connecting the programmers VCC
 - Program the chip

Regards,

Graeme