[syslinux] USB key: CBIOS line printed, nothing else
H. Peter Anvin
hpa at zytor.com
Wed Sep 6 17:31:14 PDT 2006
Josh Lehan wrote:
> Rory Vieira wrote:
>> My own system has three: USB-FDD, USB-ZIP and USB-HDD.
>> The first is definatly different to the others when I'm using my usb key...
>> On my test system I have NO options at all, but I can clearly see it's
>> being used as a floppy.
>
> Nice. There's a lot of differences between floppies and "fixed disks",
> in the BIOS. Among other things, the device number is 0x00 instead of
> 0x80,
... true (for the first device of each type) ...
> and there's a different API for accessing it.
Not really true. The geometry query function returns potential C/H/S
instead of actual C/H/S for (legacy) floppy disks, which is a problem.
> In USB-FDD mode, the BIOS might also expect the USB key to be in superfloppy format (no
> partition table or MBR, just one big filesystem across the entire disk
> surface).
The BIOS shouldn't give a hoot.
> On this particular machine, my BIOS just gives me the choice between
> USB-ZIP and USB-HDD. On 3 other systems I have access to, 2 of them
> don't give me any choice of USB modes at all, but they all do recognize
> the USB key and let me choose it as a bootable choice, and work fine.
> The third system doesn't support USB booting at all :(
>
>> My apologies for not being clear... all systems I have used my key on,
>> show EBIOS... again, my excuses for the mishaps
>
> I'm guessing USB booting support in this particular BIOS that fails to
> boot, is half-baked. It shows CBIOS. As for the others, they flash by
> too fast for me to see if they are CBIOS or EBIOS....
You should be able to press Ctrl-V at the command line and get the
banner line again.
-hpa
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