On Aug 24, 2008, at 6:32 AM, Javier Martín wrote:
2008/8/24 W. Michael Petullo <[EMAIL PROTECTED]>:
I am interested in modifying GRUB to read DMI data from my BIOS
(i.e., the data dmidecode reads). The SMBIOS specification seems to
state that the Plug-n-Play function interface is deprecated
while the
table-based interface requires a processor running in 32- or 64-bit
protected mode. Does anyone know where I could find information
on a
non-deprecated method to read DMI data while in real mode?
But you just said this can be done by parsing tables in i386 32-
bit mode,
why not just do that?
Btw, which information do you need to obtain from there?
I was under the impression that the DMI tables could be stored
above 1MB,
and that these memory locations were not easily accessible when in
real
mode.
I have now found that, at least in my hardware's case, the DMI
tables are
below 1MB and easily read. Is this the case for all hardware?
I have a client that has a piece of hardware that provides an
electronic key
via DMI when a physical key is inserted into the device. I am
writing a
command that will read that key and store it in GRUB's environment
for
Michael Gorven's LUKS module to pick up.
The environment of a GRUB module is 32-bit pmode - you can "directly"
access DMI: why do you need real mode?
I don't need real mode. But, I thought GRUB ran in real mode and
protected mode was not enabled until the kernel enabled it. So, it
looks like this is much more straightforward that I had thought.
Mike
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