[Fullquote because your flashrom related reply didn't end up on the flashrom list.]
On 29.07.2009 18:17, Peter Stuge wrote: > Carl-Daniel Hailfinger wrote: > >> this is no longer coreboot related. >> > > I think this is highly coreboot related. > > > >>> A few cm should be fine but keep them as short as possible. >>> >>> You need pins 2 (7 8) (9 10 11 12) 13 14 15 16 17 24 25 28 29 31 32 >>> >>> Hm, that's 12 but some are the same signal. The ID pins and MODE can >>> probably be tied to either VDD or VSS but check their connections on >>> the original chip first. >>> >> If we're dealing with FWH chips on ICH, you can solder both chips >> on top of each other with all pins except ID0. ID0 needs to be >> connected to a switch so that exactly one of them is high and the >> other one is low. >> > > Yes, good point, the CE in this case is ID0, and it should be > switched. ID pins are internally pulled-down so the switch circuit > actually becomes trivial. Disconnect original ID0 from mainboard. > Connect middle contact of switch to VDD via a 1k resistor. Connect > each side contact of switch to ID0 on the respective chips. The three > leads to the switch can be pretty long. > > If they are PLCC chips it isn't very practical to solder two chips on > top of each other, because the chip leads bend in under the chip and > do not reach the top. Every lead on the upper chip would have to be > bent to continue straight down to maybe reach the leads on the lower > chip. I don't know if the leads are actually long enough to make that > work. Also needs a few mm for the chip package on top of the existing > chip of course. Often it's easier to put the second chip somewhere > else on the board, and run wires. Yes, that needs a little more work. > > > //Peter > > -- http://www.hailfinger.org/ -- coreboot mailing list: [email protected] http://www.coreboot.org/mailman/listinfo/coreboot
