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Displaying QR codes for kernel crashesDisplaying QR codes for kernel crashesPosted Jul 2, 2012 15:10 UTC (Mon) by mjg59 (subscriber, #23239)In reply to: Displaying QR codes for kernel crashes by bokr Parent article: Displaying QR codes for kernel crashes
"Hit any key" won't work via BIOS if you've got a USB keyboard, and as we head to UEFI you don't have BIOS either.
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Displaying QR codes for kernel crashes Posted Jul 2, 2012 15:20 UTC (Mon) by apoelstra (subscriber, #75205) [Link]
Drop into real mode and use INT 10. ;)
Displaying QR codes for kernel crashes Posted Jul 2, 2012 15:27 UTC (Mon) by mjg59 (subscriber, #23239) [Link]
The thing about not having BIOS is that you don't have any video BIOS either :)
Displaying QR codes for kernel crashes Posted Jul 2, 2012 21:03 UTC (Mon) by rvfh (subscriber, #31018) [Link]
I know you're the expert here, but my USB keyboard works in my BIOS... What am I missing here?
Displaying QR codes for kernel crashes Posted Jul 2, 2012 21:19 UTC (Mon) by mjg59 (subscriber, #23239) [Link]
Not once the OS has taken over. It's a one-way transition.
Displaying QR codes for kernel crashes Posted Jul 2, 2012 21:48 UTC (Mon) by apoelstra (subscriber, #75205) [Link]
Once you step out of "real mode" (i.e., 16-bit DOS mode) into "protected mode" (32-bit or 64-bit, multiple memory permission rings, all that jazz), you no longer have access to the BIOS or its interrupts, so you can't ask it for help with peripherals anymore.
Before then, the BIOS will give you keyboard access, tell you what drives are installed and what size they are, let you write to the screen, all sorts of wonderful stuff. For example, you can write "Hello world!" in assembler for an x86 PC, using only a couple dozen opcodes, which is very exciting when you're first learning about such a low level.
If UEFI really means the loss of all that, it makes me kinda sad.
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