Pavel Machek wrote:Why do you think it's necessary to turn off acpi mode? What will not work if we keep it on all the time? BTW, let me summarize my understanding of the kexec approach: * the userspace write the new DSDT (cat my-dsdt-image > /sys/firmware/acpi/tables/DSDT) * the kernel don't use this DSDT directly but keeps it somewhere warm and fuzzy in the RAM * userspace does a kexec * the new kernel boots and at some (early) point, dsdt_override() is called. It detects that the special place in the RAM for a new DSDT is used. It provides this pointer to ACPI as the new place to read the DSDT. Dave, am I correctly understanding the scenario you had in mind? I have pratically no knowledge of kexec. Is there a documented way to pass big chunk of data from one kernel to another one? How can I do that? Eric --
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