Quoting Peter Stuge peter@stuge.se:
On Sat, Sep 01, 2007 at 10:13:21PM +0200, Carl-Daniel Hailfinger wrote:
SPI detection/flashing support is on my list.
Is the SPI flash connected to the sio on the m57sli?
No idea.
So we should find out.
Ward - do you have a continuity tester? Could you see if the SPI flash chip is connected to the Super IO?
If I get a high-res photo of the Super IO and the flash chip area I can mark the pins that should be connected on both to get a yes/no indication.
Hi Peter,
The spi clock signal (SCK - pad 25 of the SIO) doesn't seem to be directly connected to the pad 6 of the bios spi chip.. One could think that there is a serial resistor between them (for signal integrity) but when I measure the resistance value between the 2 nodes I find values greater than 1 kohm.. I think that for the operating frequency (I measured 25 MHz for this signal with the scope on the bios chip pad), if there was a serial resistor it should had much a much lower value (maybe something like 50 ohm f.ex..) Please, someone with better electronics background can correct me if Im wrong on this topic? Also when studying the board with a powerfull magnifying glass around the sio chip, one can see that the trace starting on the pad 25 apparently ends with a unpopulated smt resistor (?) footprint. In fact, there is also a via connected to this signal, but here I have no way figuring where this signal go trough this via. (btw, as a joke, has someone here a good friend which is tooth physician or radiologist to do a X-ray radiography of this board? ;-) ) Now, back to my investigations.. Florentin