On Mon, 2012-11-05 at 11:30 +0100, Greg KH wrote: > Odds are, the windows driver just isn't even loaded on the newer > machines, as ACPI works just fine for this. But, we don't have the > option of shipping custom systems for different laptops like Samsung > does, so we have to probe for this somehow. > > Initally we were looking at the DMI strings for specific laptop models, > but that got annoying as we had to keep adding new models. So we now > just check the memory locations for all Samsung laptops, which was > working fine. > > What is the problem if we try to access this memory on UEFI machines? > What is the error that is caused? Machine Check Exceptions are generated. > Is there any "this_is_a_uefi_system()" type call drivers can make to > just opt-out if that call is true? There is the 'efi_enabled' variable, but it doesn't strictly mean "this_is_a_uefi_system()", it actually means "Do we have EFI runtime services?". The whole thing is a bit of a mess and I'm planning on cleaning it up this week. -- Matt Fleming, Intel Open Source Technology Center -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
