Am Dienstag, den 06.01.2015, 12:30 +0100 schrieb Michał Masłowski: > > Does somebody have a coreboot log from serial or USB for cold boot and > > resume, please? I am unable to get one right now, because the docking > > station is not here. > > I have logs from EHCI debug: normal boot and resume from suspend to RAM.
Thanks a lot! > >> Using dd, grep and hexdump shows that the coreboot table entry at memory > >> address 0x500 gets zeroed. /proc/iomem considers that address > >> "reserved". > > Guessing from searching the code: smm_setup_structures from > src/southbridge/intel/i82801gx/smi.c overwrote it, called by acpi_resume > in src/arch/x86/boot/acpi.c. I haven't checked how the (mentioned in > the comment) GNVS relocation or coreboot table writing are done, nor how > it's different when resuming. Yes, that looks correct. Thank you for the analysis. Looking through the code, the function is implemented differently for Intel BD82x6x and later models. I tried to quickly backport this to Intel 82801Gx, but failed [1]. Stefan gave some good hints already: > I think on core / core2 SMM is not using TSEG (in our implementation), > so you'll have to look at the ASEG. > > Since you might be running on either a core cpu (32bit) or core2 > (64bit) you might need to determine what CPU you're running on (at > runtime) and use the according XXX_state_save_area_t. If the offsets > for the registers you are looking at are the same for both CPU types, > you can probably avoid that.. > > Look at src/cpu/x86/smm/smihandler.c for how stuff was set up there. and > rbx doesn't exist on 32bit CPUs, so you'll have switch at runtime here > depending on the CPU type. Kyösti also replied: > FYI: I have an incompleted patchset to convert from SMM TSEG relocator > to SMM_MODULES, and I do not see what would prevent from converting > ASEG SMI handlers to SMM_MODULE too. So, I guess I’ll wait until that work is done. If somebody else has another idea how to solve that for the Intel 82801Gx, please share. Thanks, Paul [1] http://review.coreboot.org/8139/
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