I wouldn't have expected a reset to be done on shutdown -r since that
doesn't force POST to run. My guess is that we go directly to the BIOS to
read the bootstrap (INT 19 is it??)
Richard Moore - RAS Project Lead - Linux Technology Centre.
http://oss.software.ibm.com/developerworks/opensource/linux
Office: (+44) (0)1962-817072, Mobile: (+44) (0)7768-298183
PISC, MP135 Galileo Centre, Hursley Park, Winchester, SO21 2JN, UK
Tigran Aivazian <tigran@veritas.com> on 21/09/2000 09:50:53
Please respond to Tigran Aivazian <tigran@veritas.com>
To: linux-kernel@vger.kernel.org
cc: (bcc: Richard J Moore/UK/IBM)
Subject: cpu reset on laptops and microcode update.
Hi guys,
A long time ago I noticed a curious feature on my Dell Latitude CPx
H-450GT laptop - rebooting it via "shutdown -r now" (and therefore going
through BIOS) does not discard the microcode applied to the CPU. But I
would expect it to be discarded as prescribed by Intel manuals, on #RESET.
Does it mean that rebooting a laptop does not actually ever reset the
CPU? (this would imply that the BIOS is also a protected mode software?)
Of course, doing "shutdown -h now" and switching off the power does
discard the microcode as expected.
Any thoughts? I post on linux-kernel because, potentially, your thoughts
may become relevant to the content of arch/i386/kernel/microcode.c which
is part of Linux kernel :)
Regards,
Tigran
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This archive was generated by hypermail 2b29 : Sat Sep 23 2000 - 21:00:24 EST