From: Peter Chubb <peter.chubb@nicta.com.au>
To: horms@verge.net.au
Cc: kexec@lists.infradead.org
Subject: kexec-tools and multiboot breakage
Date: Wed, 15 Jan 2014 13:25:49 +1000 [thread overview]
Message-ID: <84k3e2lyde.wl%peter.chubb@nicta.com.au> (raw)
Hi Simon,
When you get a moment, please check out
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=735360
Quick summary:
If your kernel is configured to protect the first few pages of
physical memory, then low memory doesn't start at location 0 --- so
when scanning the memory ranges from /proc/iomem, the code in
kexec/arch/i386/kexec-multiboot-x86.c never fills in mem_lower.
I think it's safe to assume that if a memory segment starts at 64k or
lower, it can be extended to location 0 because of the kernel
protection on a PC99-style architecture.
Peter C
--
Dr Peter Chubb peter.chubb AT nicta.com.au
http://www.ssrg.nicta.com.au Software Systems Research Group/NICTA
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next reply other threads:[~2014-01-15 3:26 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-15 3:25 Peter Chubb [this message]
2014-01-15 3:48 ` kexec-tools and multiboot breakage Simon Horman
2014-01-15 21:39 ` [PATCH] Fix value of mbi->mem_lower for multiboot-x86 Peter Chubb
2014-01-16 0:22 ` Simon Horman
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