[flashrom] Re: How to obtain a BIOS image from another computer use flashrom？
Hi Mike, On 29.01.22 15:50, Mike Banon wrote: > Hi there Angel, thank you for your reply and clarification! Please > tell, is this command > >> sudo flashrom -p internal:laptop=force_I_want_a_brick,amd_imc_force=yes -r >> ./build/coreflop.rom > > - dangerous to run, even if it's only trying to read (-r) and not > write? (aside from "irritating the EC" possibly causing a sudden > power-off). if one doesn't know the mainboard, it is indeed dangerous even for probing. Otherwise it wouldn't be a scary option ;) If one knows the mainboard and that the flash chip is *not* connected via LPC/FWH _through_ the EC, then one can remove the need of this option by adding an entry to `board_enable.c`. Nico ___ flashrom mailing list -- flashrom@flashrom.org To unsubscribe send an email to flashrom-le...@flashrom.org
[flashrom] Re: How to obtain a BIOS image from another computer use flashrom？
Hi there Angel, thank you for your reply and clarification! Please tell, is this command > sudo flashrom -p internal:laptop=force_I_want_a_brick,amd_imc_force=yes -r > ./build/coreflop.rom - dangerous to run, even if it's only trying to read (-r) and not write? (aside from "irritating the EC" possibly causing a sudden power-off). As for "amd_imc_force=yes", sorry was my mistake On Mon, Jan 24, 2022 at 3:28 PM Angel Pons wrote: > > Hi, > > On Sun, Jan 23, 2022 at 9:49 AM Mike Banon wrote: > > > > Good day! The flashrom software has the "internal" mode - using which, > > you may be able to access the BIOS chip directly from your OS, if your > > hardware is supported. In example: > > > > sudo flashrom -p > > internal:laptop=force_I_want_a_brick,amd_imc_force=yes -r > > ./build/coreflop.rom > > Mike, can you please explain why you've suggested using such a > dangerous command without even knowing which system it's going to be > run on? The `force_I_want_a_brick` name is intentional, as flashrom > can cause problems on certain laptops (most laptops from the last > decade should be fine, though), c.f. https://www.flashrom.org/Laptops > for a detailed explanation. And you've suggested using `amd_imc_force` > even though it only applies to AMD southbridges using SPI. > > I know you're just trying to help, but I'm afraid that suggesting > people to run dangerous commands on unknown hardware without > mentioning the risks is not helpful. > > > I think this mode is available only on Linux (may have to boot with > > "iomem=relaxed" kernel flag) - however, you may boot a Linux LiveUSB > > on your target PC to use Linux without the installation in a live > > mode. > > On x86, the internal programmer should also work on most BSDs and > Darwin (macOS). It might even work on Solaris. > > On Linux, the `iomem=relaxed` kernel parameter can be used when a > kernel module conflicts with the resources flashrom wants to use, but > it reduces the system's security. On Intel systems, unloading the > `lpc_ich` kernel module should allow using flashrom's internal > programmer without having to boot with `iomem=relaxed`. > > > As for "how do I remotely obtain a BIOS image from another computer > > using flashrom" - if this internal mode is available to you, and a > > target PC is running Linux, you can remotely connect to this PC using > > a SSH (or VPN + SSH), run the flashrom command to read a BIOS image > > from a chip, and then - using scp - copy the obtained BIOS image to > > your own PC > > > > > > On Fri, Jan 21, 2022 at 3:26 AM zy <2018111...@bupt.cn> wrote: > > > > > > Hi， > > >I'm a student from China and I've been learning flashrom，So I would > > > like to know whether the flashrom can support extracting BIOS firmware > > > images under Windows 7/10. > > >If I don't have the Internet（Just LAN），how do I remotely obtain a BIOS > > > image from another computer use flashrom？ > > >Maybe my English not very well. Thank you very much. > > On Windows, flashrom's internal programmer is unusable. It requires > libpci and raw memory access; libpci is not available on Windows as > far as I know, and I think Windows restricts raw memory access from > userspace code for security reasons. One could try to implement the > required functionality in a driver, but one would also need to > convince Microsoft to sign the driver. It could be done, but it's not > easy. No one is working on this, as far as I know. > > > >Looking forward to your reply. > > > > > > > > > ___ > > > flashrom mailing list -- flashrom@flashrom.org > > > To unsubscribe send an email to flashrom-le...@flashrom.org > > > > > > > > -- > > Best regards, Mike Banon > > Open Source Community Manager of 3mdeb - https://3mdeb.com/ > > ___ > > flashrom mailing list -- flashrom@flashrom.org > > To unsubscribe send an email to flashrom-le...@flashrom.org > > Best regards, > Angel -- Best regards, Mike Banon Open Source Community Manager of 3mdeb - https://3mdeb.com/ ___ flashrom mailing list -- flashrom@flashrom.org To unsubscribe send an email to flashrom-le...@flashrom.org
[flashrom] Re: How to obtain a BIOS image from another computer use flashrom？
Hi, On Sun, Jan 23, 2022 at 9:49 AM Mike Banon wrote: > > Good day! The flashrom software has the "internal" mode - using which, > you may be able to access the BIOS chip directly from your OS, if your > hardware is supported. In example: > > sudo flashrom -p > internal:laptop=force_I_want_a_brick,amd_imc_force=yes -r > ./build/coreflop.rom Mike, can you please explain why you've suggested using such a dangerous command without even knowing which system it's going to be run on? The `force_I_want_a_brick` name is intentional, as flashrom can cause problems on certain laptops (most laptops from the last decade should be fine, though), c.f. https://www.flashrom.org/Laptops for a detailed explanation. And you've suggested using `amd_imc_force` even though it only applies to AMD southbridges using SPI. I know you're just trying to help, but I'm afraid that suggesting people to run dangerous commands on unknown hardware without mentioning the risks is not helpful. > I think this mode is available only on Linux (may have to boot with > "iomem=relaxed" kernel flag) - however, you may boot a Linux LiveUSB > on your target PC to use Linux without the installation in a live > mode. On x86, the internal programmer should also work on most BSDs and Darwin (macOS). It might even work on Solaris. On Linux, the `iomem=relaxed` kernel parameter can be used when a kernel module conflicts with the resources flashrom wants to use, but it reduces the system's security. On Intel systems, unloading the `lpc_ich` kernel module should allow using flashrom's internal programmer without having to boot with `iomem=relaxed`. > As for "how do I remotely obtain a BIOS image from another computer > using flashrom" - if this internal mode is available to you, and a > target PC is running Linux, you can remotely connect to this PC using > a SSH (or VPN + SSH), run the flashrom command to read a BIOS image > from a chip, and then - using scp - copy the obtained BIOS image to > your own PC > > > On Fri, Jan 21, 2022 at 3:26 AM zy <2018111...@bupt.cn> wrote: > > > > Hi， > >I'm a student from China and I've been learning flashrom，So I would like > > to know whether the flashrom can support extracting BIOS firmware images > > under Windows 7/10. > >If I don't have the Internet（Just LAN），how do I remotely obtain a BIOS > > image from another computer use flashrom？ > >Maybe my English not very well. Thank you very much. On Windows, flashrom's internal programmer is unusable. It requires libpci and raw memory access; libpci is not available on Windows as far as I know, and I think Windows restricts raw memory access from userspace code for security reasons. One could try to implement the required functionality in a driver, but one would also need to convince Microsoft to sign the driver. It could be done, but it's not easy. No one is working on this, as far as I know. > >Looking forward to your reply. > > > > > > ___ > > flashrom mailing list -- flashrom@flashrom.org > > To unsubscribe send an email to flashrom-le...@flashrom.org > > > > -- > Best regards, Mike Banon > Open Source Community Manager of 3mdeb - https://3mdeb.com/ > ___ > flashrom mailing list -- flashrom@flashrom.org > To unsubscribe send an email to flashrom-le...@flashrom.org Best regards, Angel ___ flashrom mailing list -- flashrom@flashrom.org To unsubscribe send an email to flashrom-le...@flashrom.org
[flashrom] Re: How to obtain a BIOS image from another computer use flashrom？
Good day! The flashrom software has the "internal" mode - using which, you may be able to access the BIOS chip directly from your OS, if your hardware is supported. In example: sudo flashrom -p internal:laptop=force_I_want_a_brick,amd_imc_force=yes -r ./build/coreflop.rom I think this mode is available only on Linux (may have to boot with "iomem=relaxed" kernel flag) - however, you may boot a Linux LiveUSB on your target PC to use Linux without the installation in a live mode. As for "how do I remotely obtain a BIOS image from another computer using flashrom" - if this internal mode is available to you, and a target PC is running Linux, you can remotely connect to this PC using a SSH (or VPN + SSH), run the flashrom command to read a BIOS image from a chip, and then - using scp - copy the obtained BIOS image to your own PC On Fri, Jan 21, 2022 at 3:26 AM zy <2018111...@bupt.cn> wrote: > > Hi， >I'm a student from China and I've been learning flashrom，So I would like > to know whether the flashrom can support extracting BIOS firmware images > under Windows 7/10. >If I don't have the Internet（Just LAN），how do I remotely obtain a BIOS > image from another computer use flashrom？ >Maybe my English not very well. Thank you very much. > > >Looking forward to your reply. > > > ___ > flashrom mailing list -- flashrom@flashrom.org > To unsubscribe send an email to flashrom-le...@flashrom.org -- Best regards, Mike Banon Open Source Community Manager of 3mdeb - https://3mdeb.com/ ___ flashrom mailing list -- flashrom@flashrom.org To unsubscribe send an email to flashrom-le...@flashrom.org
