On Mon, Jun 07, 2021 at 07:22:21PM +0300, Andy Shevchenko wrote: > On Sat, Jun 05, 2021 at 03:51:05PM +0800, Dave Young wrote: > > On 06/02/21 at 11:53am, Andy Shevchenko wrote: > > > On Wed, Jun 02, 2021 at 11:42:14AM +0300, Andy Shevchenko wrote: > > > > On Fri, Dec 02, 2016 at 09:54:14PM +0200, Andy Shevchenko wrote: > > > > > Until now DMI information is lost when kexec'ing. Fix this in the same way as > > > > > it has been done for ACPI RSDP. > > > > > > > > > > Series has been tested on Galileo Gen2 where DMI is used by drivers, in > > > > > particular the default I2C host speed is choosen based on DMI system > > > > > information and now gets it correct. > > > > > > > > Still nothing happens for a while and problem still exists. > > > > Can we do something about it, please? > > > > Seems I totally missed this thread. Old emails lost. > > You can always access to it via lore :-) > https://lore.kernel.org/linux-efi/20161217105721.GB6922@xxxxxxxxxxxxxxxxxxxxxxxxxx/T/#u > > (Okay, it's not full, but contains main parts anyway) > > > > The question Ard asked is to confirm if the firmware converted the > > SMBIOS3 addr to a virtual address after exit boot service. I do not > > remember some easy way to check it due to lost the context of the code. > > But you can try to check it via dmesg|grep SMBIOS both in normal boot > > and kexeced boot log. And then compare if those addresses are > > identical. > > > > If the SMBIOS3 addr in kexec kernel is different then it should have > > been modified by firmware. Then we need patch kernel and kexec-tools to > > support it. > > > > You can try below patch to see if it works: > > So, AFAIU I have to apply patch to kexec tools for the fist kernel + userspace > and apply kernel patch for the second kernel? Or it's all for the first one? > > > apply a kexec-tools patch to kexec-tools if you do not use kexec -s > > (kexec_file_load): > > Here is how we are using it: > https://github.com/andy-shev/buildroot/blob/intel/board/intel/common/netboot/udhcpc-script.sh#L54 Okay, thanks for the patches. I have applied them to both kernels, so the first one and second one are the same and kexec tools have a patch provided in the user space of the both kernels (only first one in use though). Before applying your patch, I have reverted my hacks (as per this series). Result is: # uname -a Linux buildroot 5.13.0-rc5+ #1 SMP Mon Jun 7 19:49:40 EEST 2021 i586 GNU/Linux # dmidecode # dmidecode 3.3 Scanning /dev/mem for entry point. # No SMBIOS nor DMI entry point found, sorry. I.o.w. it does NOT fix the issue. My patches do (with a hint from user space). -- With Best Regards, Andy Shevchenko
