[Bug 509006] Re: [dove] hibernation failed to resume

[Eric Miao]

After several rounds of error and trial with JTAG debugging, it turned
out this may be related to the page table being corrupted during
hibernation resume. With explicit 'resume=/dev/sda5' in kernel command
line, the resume happens earlier as the kernel is still running as
swapper (or idle) process, and the page table is placed somewhere safe
(PHYS == 0x0000_4000 if you are interested), and the content will not be
overwritten during the RAM content restoration. While resume triggered
by initramfs, it's actually running a user space program (i.e.
/bin/resume from klibc-utils), with the page table for this specific
process being potentially overwritten. This apparently affects all ARM
variants, and we need a patch to avoid such overwrite.

-- 
[dove] hibernation failed to resume
https://bugs.launchpad.net/bugs/509006
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