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Re: Does reboot clear RAM?

From: Kent Dorfman
Subject: Re: Does reboot clear RAM?
Date: Sun, 10 Nov 2019 13:17:31 -0500

Many non-intel platforms do wipe memory on reset (RST).  It's a
security feature to make in more dificult for folks with jtag
breakouts to examine secure code/data.

On 11/10/19, Joachim Durchholz <address@hidden> wrote:
> Do physical machines wipe memory?
> They don't on shutdown, and memory tends to retain bits for a while
> (seconds to hours, depending on temperature and RAM technology).
> I don't know what RAM chips do if they are reset. Do they even have a
> reset line nowadays?
> Am 09.11.19 um 10:56 schrieb Narcis Garcia via:
>> In my humble opinion, Qemu should wipe any released RAM area because of
>> guest shutdown or reboot, same as a physical machine, to guest finds
>> it's booting in same conditions.
>> El 8/11/19 a les 23:55, Nachammai Karuppiah ha escrit:
>>> Does qemu clear the physical address on guest reboot?
>>> Qemu is started with kernel parameters, ramoops.mem_address=0x7f00000
>>> ramoops.mem_size=0x100000 but I do see that the memory even outside
>>> this region is not wiped away and is retained after rebooting the
>>> guest

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