Hi Peter, On Tue, Jan 12, 2021 at 4:26 PM <reddu...@online.de> wrote: > > 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
You may be able to port it, though you will need to use Intel FSP. I'm afraid no one wrote a coreboot porting guide for FSP platforms yet. If you ask me, I'd rather write a FSP replacement, but ENOTIME. > 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. This chip contains the LSPCON (Parade PS175) firmware. I know because I've got a different board here with the same setup. It is a SPI flash chip, but it's not the one you are looking for. > 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 None of these is large enough. You are looking for a SOIC8 200mil chip: https://doc.coreboot.org/_images/librem_mini_flash.jpg > Pics of the mainboard front and back are here: > https://pasteboard.co/JJjQqQO.jpg > https://pasteboard.co/JJjRjLU.jpg > https://pasteboard.co/JJjRCDt.jpg I can't see any flash chip on the pictures you sent. Could you please take one picture of each side of the mainboard without any obstructions (RAM sticks, add-in cards, tape...) on it? > 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 Best regards, Angel _______________________________________________ coreboot mailing list -- coreboot@coreboot.org To unsubscribe send an email to coreboot-le...@coreboot.org
