Hi Nico, thank you, this helped me a lot and I got coreboot running by just flashing the top 4MB to the smaller chip. Yet there are a few things I still don't understand:
- as the bios region spans both chips, how does this work when I only flash the bios region into one part of this region? I assumed some of the original bios would be missing, resulting in a brick. - where is the firmware of the EC controller actually located? It's not mentioned in the ROM layout map. - to my understanding, applying me_cleaner would mean I need to flash the 8MB chip as well. Can this be done internally once I have coreboot running or will the ifd lock in the descriptor (that was left untouched) block this access, so in the end I will need to disassemble the T440p to get physical access to the 8MB chip? - to take advantage of the space gained by applying me_cleaner, the descriptor would need to be reflashed as well, right? Can this be done internally as well? - I tried to compile GRUB as payload first, but it didn't fit in the space so I had to go for SeaBIOS. Is there a way to get GRUB working without touching the 8MB chip? I wonder why it doesn't fit into the 4 MB space of the smaller ... is the size of the CBFS region set correctly to the available maximum by default? Again, thanks a lot! I will try to submit a merge request for the doc article about the T440p once I get a better understanding of this. Cheers, Daniel On Tue, 13 Oct 2020 22:18:23 +0200 Nico Huber <[email protected]> wrote: > Hi Daniel, > > On 13.10.20 21:59, Daniel Kulesz via coreboot wrote: > > The build fails because I don't have the other proprietary parts > > (descriptor.bin, me.bin, gbe.bin). > > you can simply omit them. If you don't tell that you have them (in your > config), coreboot won't miss them. > > > Or is this process meant the way that I should build coreboot without these > > parts and only flash the BIOS region, not touching them? > > That's it. Generally, for any retrofit coreboot, they are already on > the machine, so you never have to extract them. In case of the T440p, > the BIOS region spans the end of the 8MiB and the whole 4MiB chip[1]. > Hence, you never need to deal with descriptor/gbe/me if you only flash > the latter. > > Remember to build coreboot for 12MiB and take the last 4MiB of the > resulting `coreboot.rom` and always keep a backup ;) > > Nico > > [1] https://doc.coreboot.org/_images/flashlayout_Ivy_Bridge.svg _______________________________________________ coreboot mailing list -- [email protected] To unsubscribe send an email to [email protected]
