Is pin 30 connected to anything on those boards? Pin 30 is most significant address bit with a 2 megabit chip. Maybe they're looking towards the future?
I had good success with programming some 1megabit eeproms salvaged from dead motherboards, none of my realteks came with 32pin sockets, but i found three that were extend-able. You add the note about 28 pin chips in 32pin sockets to the wiki yourself. The outdated information on EPROM programmers is probably due to each person burning eproms needing _access_ to one, not necessarily everyone owning their own. I'm not sure a big list of peoples preferences on bootrom chip burning is a good idea. a better idea would be to have a list of pros and cons for each of UV, OTP, EEPROM. "KyleK prefers to burn eeproms on realtek 8139's" a big list like that seems crufty, but maybe I have the wrong idea? On Sun, Nov 29, 2009 at 5:08 AM, Paul Geraedts <[email protected]>wrote: > Hello, > > The RTL8139 wiki page (http://etherboot.org/wiki/realtek8139roms) > contains a lot of very useful information for new users. > > Among others it mentions that the 32 pins sockets are backwards > compatible with the 28 pins chips. I agree with that, but I also > observed that some PCB manufactures are a bit sloppy here. That is, > for this to work they should have connected pin 32 (V_DD) to pin 30 > (NC). Meaningless for 32 pins chips, but vital for 28 pins ones: their > pin 28 (V_DD) ends up in this pin 30 of the 32 pins socket and the > chip would otherwise not be supplied with power! > > So I think it would be a good addition to the wiki page to mention > that if 28 pins chips do not work in 32 pins sockets, then to check > that pins 32 and 30 are properly connected together. A quick fix can > be a wire pushed in both socket pins, but soldering is more reliable > of course. > > > Than something else. I think it is still a bit intimidating for new > users to start working on the hardware side of gPXE. For instance what > EPROM programmer to buy that is both cheap, modern and readily > available? I couldn't find one in the wiki pages: most programmers > mentioned there were outdated. After some additional research I > finally bought a very nice one on EBay (TOP2005+, $45, proper English > Windows software, unfortunately no Linux support AFAIK). The same is > true for the type of chip to use: I eventually bought the 28 pins > (ATMEL AT)27C512R. An OTP version of the original EEPROM: very cheap > and no hassle with UV lights. A personal choice of course, but I think > that a list where people can add their preference would be a nice > addition to the wiki. The same holds for a list of chipset related ROM > burning info: only accidently I discovered the realtek8139roms page. A > summarizing list of all wiki pages on this topic would be very helpful > here I'd say. If such lists are added, I would be happy to add my > preference. > > The whole thing works great now: the combination of WOL and gPXE > allows me to remotely boot the computers with whatever OS I choose > without needing any physical access. Very nice system you guys > implemented! > > Cheers, > > Paul > _______________________________________________ > gPXE mailing list > [email protected] > http://etherboot.org/mailman/listinfo/gpxe >
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