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- USB Boot (not floppy) on a Vaio VGN-T250P
May 2, 2006, 4:07 am
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from what I have read this vaio (amongst others) can only boot from usb
using a sony usb floppy drive. Since my memory stick is formatted
FAT32, it seems reasonable to think that one could masquerade a memory
stick as a sony usb floppy drive.
Anyone have an idea how the bios restricts usb booting? A device ID?
Some sort of handshaking?
Patching the bios to remove this restriction was my original idea but
I'd rather not brick my baby. Any idea?
Re: USB Boot (not floppy) on a Vaio VGN-T250P
It certainly appears that the bios is customized. I removed the binary
bios image from the executable installer (it decompresses it into a
temporary file when the installer is run -- I located the folder with
Process Explorer and copied it out while the process was paused) and I
opened the BIOS image in the Phoenix BIOS Editor. All the various
modules seem standard (if restricted to the bare bones of options)
except the boot order stuff (and a few other things), which the BIOS
editor fails to load properly. I could try replacing it with the boot
order module from a standard phoenix bios and rebuilding a new bios
(then I could also get rid of the VAIO logo on boot). But I b0rked the
bios on one of my desktops a long time ago (i was a kid :) and it was
hell fixing it (all the while seriously freaking out that my parents
would find out I broke the computer). I can't imagine that I could swap
the bios flash chip out of a laptop and re-flash it elsewhere. I doubt
it's even removable.
At any rate I will investigate the bios further. I want to find exactly
how it restricts boot to only sony devices.
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