Great! thank you Petr for finding this "easter egg" :) I've looked so strongly on SOIC that I didn't even mention a socketed bios, especially if it would be hidden in a housing.. One have to open the grey plastic box to access the not even soldered 64Mbit Bios chip
https://pasteboard.co/JJl7Wts.png Without your help I would have given up :)) Could you give me a hint, how this type of Rom could be handled ? Am 12.01.21 um 20:03 schrieb Petr Cvek: > lol I've found it :-D it's not a chip, it's actually a socket > > right of wifi https://pasteboard.co/JJknICr.jpg "BIOS ROM" on PCB > > Petr > > Dne 12. 01. 21 v 19:14 Peter Mueller napsal(a): >> Yes, I have removed all strips, ram and extension cards, so I have seen all >> SOIC8 chips on the board. >> But this is what I do not understand, I find no more then I showed in the >> pics. I will >> send some more/better pics, so you could see more details. I removed all >> strips and extensions, where any >> SOIC like chip is located, the other strips and extensions I put back before >> making the pictures. >> >> Here are all images in high res, that I have made. >> >> https://pasteboard.co/JJklNqI.jpg >> https://pasteboard.co/JJknICr.jpg >> https://pasteboard.co/JJkovSn.jpg >> https://pasteboard.co/JJkoX3I.jpg >> https://pasteboard.co/JJkpubK.jpg >> https://pasteboard.co/JJkpYwS.jpg >> https://pasteboard.co/JJkqp7Ai.jpg >> https://pasteboard.co/JJkqYgH.jpg >> https://pasteboard.co/JJkrSsC.png >> https://pasteboard.co/JJksajd.jpg >> >> It puzzles me, that I could not even find out where the fw image is stored. >> This will probably mean that >> there will be no secure (extern) flashing process, if no core boot, not even >> disable ME, if I did not miss >> something.. >> >> I have seen that some coreboot tutorial ( I think for a thinkpad x220, but >> not shure ) mentioned that the >> 12 MB firmware of the system was physically joined by 2 chips (8+4MB) to a >> virtual flash chip. >> >> Is it possible that >> >> a) the 8MB flash is assembled by part of the 12 pieces of M B07 N03 EKH >> 1409 ? >> b) or it is stored in another non SOIC 8 format ? >> c) or even part of the intel cpu /chipset ? >> >> Sorry for asking maybe not sensible questions, I have yet too few knowledge >> on these >> bios hardware concepts. >> >> >> >> Am 12.01.21 um 17:45 schrieb Petr Cvek: >>> Did you looked under black isolation stripes? >>> >>> There is one soic-8 at the top of this photo >>> >>> https://pasteboard.co/JJjRjLU.jpg >> This is one more "unmarked" of the smaller SOIC8 I labeled with "b" >> b - 12 pieces of SOIC8 150mil (or samller?) : M B07 N03 EKH 1409 (Macronix? >> could not find anything:/ ) >> >>> next to superio U49. There can be more chips under expansion cards. >>> >>> BTW you can eliminate chips which doesn't have the standard SPI pinout (for >>> example you can try measure continuity test for GND pin of the SPI - this >>> can be done safely on unpowered board, other can be Vcc, maybe clock). >>> >>> Petr >>> >>> Dne 12. 01. 21 v 17:25 [email protected] napsal(a): >>>> Hello coreboot community, >>>> >>>> as an open source fan I recently get to know coreboot and really like the >>>> idea behind. >>>> Sadly I bought my computer HW before learning more on libre friendly >>>> hardware that >>>> respects your freedom. Now I try to figure out if I could do one or both of >>>> a) installing coreboot , b) remove /disable ME from my zotac mini PC, >>>> or I had to look out for already supported HW to do so. >>>> >>>> I use a zotac CI 640 nano fanless mini PC with kaby lake Intel Core >>>> i5-8250U and intel >>>> UHD grafics. https://www.zotac.com/product/mini_pcs/ci640-nano#spec >>>> >>>> In the process of cleaning FW I got stuck while figuring out, what is the >>>> relevant flash IC >>>> storing the bios. Form running linux I could read an 8MB flashrom with >>>> flashrom tool and >>>> internal programmer. >>>> >>>> While reading, flashrom reported chipset "Intel Kaby Lake U w/ iHDCP2.2 >>>> Prem." >>>> and gave the warning "SPI configuration lockdown activated". The >>>> programmer >>>> flashchip was reported as "Opaque flash chip" 8192kB. >>>> At least ME Cleaner worked with not errors on the captured fw image. >>>> >>>> Problem: I want to flash the modified image back to the IC using a >>>> raspberry 4b >>>> with gpio spi setup using a SOIC8 clip. But I could not manage to find the >>>> correct >>>> IC on the mainboard. I kept looking for SOIC8 200mil with some "25" >>>> signature >>>> and found only a GD25Q20C(2M-bit)Serial flash chip, that I could >>>> successfully >>>> read with raspberry spi setup. However, it contains only 256k data. >>>> strings showed >>>> me lots of HDMI related stuff. >>>> >>>> I have created a list of chips I found while disassembling and some pics. >>>> I hope that someone more experienced could explain me how the 8MB fw is >>>> stored on this zotac and if it is "safely" possible to rewrite it. I it is >>>> to difficult or >>>> dangerous, as beginner I will stick with new hardware from already >>>> supported >>>> hw list. >>>> >>>> The "promising" IC chips I found were >>>> a - 1 piece of "G labeled" AH1815 25Q2 1BT EE455, I think it is related to >>>> the >>>> GigaDevice GD25Q20C(2M-bit)I found on web. this chip I managed to >>>> read out.. >>>> b - 12 pieces of SOIC8 150mil (or samller?) : M B07 N03 EKH 1409 >>>> (Macronix? could not find anything:/ ) >>>> c - 1 piece of Issi IS25LQ020: 256K x 8 (2 Mbit) (maybe related to USB-C >>>> extension module) >>>> d - 1 piece of RT9059 GSP6E TOC, which I think could be a RichTek ultra >>>> low power voltage regulator? >>>> e - 4 pieces of "P labeled" 6982 GA9C1E ICs, I do not know what they are, >>>> maybe some MOSFET? >>>> f - 1 piece of "P labeled" 4435 GL9B2E SOIC8 200mil which I know nothing >>>> about >>>> >>>> Pics of the mainboard front and back are here: >>>> https://pasteboard.co/JJjQqQO.jpg >>>> https://pasteboard.co/JJjRjLU.jpg >>>> https://pasteboard.co/JJjRCDt.jpg >>>> >>>> Any suggestion how to go on or stop it anyway would be appreciated. >>>> >>>> kind regards, >>>> >>>> Peter Mueller >>>> _______________________________________________ >>>> coreboot mailing list -- [email protected] >>>> To unsubscribe send an email to [email protected] _______________________________________________ coreboot mailing list -- [email protected] To unsubscribe send an email to [email protected]
