kristianpaul | !seeen antgreen | 01:23 |
---|---|---|
kristianpaul | oops | 02:10 |
wolfspraul | aw: you there? | 06:10 |
aw | wolfspraul, hi yes | 06:11 |
wolfspraul | we may have found another rc3 bug | 06:11 |
wolfspraul | the idea is to add a 4.7k pullup on CE0 and WE# of the nor flash | 06:11 |
wolfspraul | Werner is currently investigating whether that fixes anything, but from the datasheet it definitely looks like the right thing to do | 06:12 |
wolfspraul | so the question for you right now is: | 06:12 |
wolfspraul | can you find out how difficult it is to rework existing rc3 boards by adding a 0402 resistor in those 2 places? | 06:13 |
wolfspraul | we don't know yet whether we want to do it, just collecting data points | 06:13 |
aw | those two pins are hard to solder since there's no alternative pads ONLY nor chip's pins on WE#(pin 55), and CE0(pin 54) | 06:15 |
aw | we're accumulating a total 70pcs "Avail-fix2b-l3" h/w patches with short L3 and lockflash version of flash version. | 06:17 |
aw | 70pcs here includes 25pcs "Packed - For Sale" and those ones sent out. With Werner's auto testing idea to verify if those two pull high resistors can suffer from exponential distribution and temperature-oriented later. :-) | 06:20 |
aw | even if the results are good for fixing, the required fixes about two 0402 resistors I currently don't have idea to easily rework them in one batch time. ;-) | 06:23 |
wolfspraul | wait | 06:23 |
aw | but it's good that one pointed. :-) | 06:23 |
wolfspraul | we don't know much about CE0 and WE# yet | 06:23 |
wolfspraul | just collecting data | 06:24 |
aw | sure | 06:24 |
wolfspraul | I am not worried about the units we are testing, packing and shipping now | 06:24 |
wolfspraul | we can definitely add CE0/WE# to the rc4 list | 06:24 |
aw | yup...but I checked already that about the reworks if needs later. like i said, it's quite a hard though. :-) | 06:24 |
aw | sure | 06:24 |
wolfspraul | then before we finalize rc4, we need to make a design verification on at least one rc3 board that those 2 pullups will not cause problems | 06:25 |
wolfspraul | so you can definitely already write down a note in the rc3 errata about ce0/we#, so we don't forget | 06:25 |
aw | Christopher Adams will come here soon. ;-) | 06:25 |
wolfspraul | the other question is whether we should fix it on rc3 boards | 06:25 |
aw | sure okay... | 06:25 |
wolfspraul | for that, let's see what werner finds out about them first | 06:26 |
wolfspraul | so you have to solder the resistor directly onto the feet of the nor chip? | 06:26 |
wolfspraul | and then a wire running somewhere, or no wire? | 06:26 |
wpwrak | yeah. and add a little wire to 3.3 V | 06:26 |
wpwrak | i'm actually more worried about the wire than about soldering to the NOR | 06:27 |
wolfspraul | can the resistor be on the other side of the wire? | 06:27 |
wpwrak | yes. that would be an option | 06:27 |
aw | yup...wait couples days after his results are if related to remaining considerations. | 06:27 |
wolfspraul | how long is the wire? | 06:27 |
wpwrak | could be just a few mm, to the next point that has 3.3 V | 06:28 |
wolfspraul | aw: ok, so right now only this for you: write down ce0/we# into the rc3 errata | 06:28 |
aw | must have two small wires to VCC and connects 0402's one terminal pad then solder to nor's two pins | 06:28 |
wolfspraul | aw: maybe the resistor can be on the other side of the wire, not directly at the nor pins | 06:28 |
aw | wpwrak, this fix for me or you may not have problems on soldering, but i really have no gurantee on the quality though. | 06:29 |
aw | soldering one board to have design validation is good to synchronize together | 06:30 |
aw | but even if your results are great enough about two resistors, i still no confidence on such two. :-) I am serious. | 06:31 |
wolfspraul | sure understand | 06:33 |
wolfspraul | aw: first step: add to rc3 errata | 06:33 |
aw | okay | 06:33 |
wolfspraul | werner will verify whether they improve anything, or add regressions | 06:33 |
wolfspraul | eventually sebastien will have a chance to quickly look at and double-check this idea | 06:34 |
wolfspraul | for rc4, it's already clear we want this unless we find regressions | 06:34 |
wpwrak | aw: (quality of rework) yes, that would be my concern, too. it would be fragile in the best case. one light touch, and it would break | 06:34 |
wolfspraul | for rc3, right now it looks like we will not add them | 06:34 |
aw | yup...i quitely prefer not to add those two resistors added to nor's two pins. it's not about i don't want to do. it's most related to that I am not sure those two wires connected to nor pins will break easily or not. | 06:36 |
aw | so i suggest to apply this to rc4 once Werner's result about this is good, and surely I can add this patch to mine and later confirm with that. | 06:37 |
wpwrak | sounds good to me | 06:40 |
wolfspraul | I think we should skip the standby state when booting, i.e. when powered arrives over the DC cable, M1 should immediately boot all the way to rendering. | 23:59 |
wolfspraul | what do you think? | 23:59 |
--- Fri Oct 7 2011 | 00:00 |
Generated by irclog2html.py 2.9.2 by Marius Gedminas - find it at mg.pov.lt!