Messages in this thread | | | Date | Thu, 25 May 2006 11:35:25 -0500 | Subject | PCI reset using x86 or x86-64 BIOS calls? | From | (Linas Vepstas) |
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I've go a newbie x86 BIOS question: is there a BIOS function that can be called to reset a PCI device? (By "reset a device" I mean raise the #RST PCI signal line to electrical high for 1.5 seconds). I know that BIOS does this during a soft reboot, but I was wondering if there's a stand-alone function for doing this while the system is up and running.
This question ame up during conversations about kexec. When kexec is used to get out from under a crashed system, the PCI devices are typically in some unknown state, and need to be brought to heel. It seems to me that a brute-force reset would be a particularly straightforward way of doing this.
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