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Author Topic: Simulating nvram?  (Read 5544 times)

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« on: January 11, 2008, 03:10:24 PM »

I'm trying to work on the Intel iwi3945 driver, and, unsurprisingly, have been getting many panics along the way.  As I only have one computer and cannot set up two-machine debugging, in order to read the kernel panics I must transcribe them and reboot.

On actual Apple hardware, the panic is saved to nvram, then crashreporterd decodes it and saves it to /Library/Logs/panic.log.  Since this system has no nvram, the panic log is not saved.

Since kNVRAMImageSize = 0x2000, only 8192 bytes would need to be kept around in order to save this information.  I must confess I'm still not quite certain how pc_efi works its magic, but would it be possible to have pc_efi simulate the nvram device, possibly by writing it to a well-known space on the hard disk, or maybe even save the panic in RAM somewhere such that most of the bits would stay the same even after a momentary power loss?
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