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] > _______________________________________________ coreboot mailing list -- [email protected] To unsubscribe send an email to [email protected]
