Dne 12. 01. 21 v 20:42 Peter Mueller napsal(a): > 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..
Yeah I didn't realised that first too. It was almost: "where the SOIC flash could be located, mosfet, mosfet, superio, socket, usb ... wait ..." :-) > 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 :)) > > glad to help > > Could you give me a hint, how this type of Rom could be handled ? It should be supported by flashrom, so just get the supported SPI adapter. Fingers crossed for making coreboot work. Petr > > 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 reddu...@online.de 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 -- coreboot@coreboot.org >>>>> To unsubscribe send an email to coreboot-le...@coreboot.org > > > _______________________________________________ coreboot mailing list -- coreboot@coreboot.org To unsubscribe send an email to coreboot-le...@coreboot.org
