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Re: Porting To New System

To: Alan Cox <>
Subject: Re: Porting To New System
From: Stanislaw Skowronek <sskowron@ET.PUT.Poznan.PL>
Date: Sat, 28 May 2005 07:07:57 +0200 (MET DST)
Cc: Cameron Cooper <>,
In-reply-to: <1117235565.5730.255.camel@localhost.localdomain>
Original-recipient: rfc822;
> You seem remarkably confident for someone who has never taken one apart.

Unless it would be very heavily restricted (rather a mmap-style thing than
a real, direct MMU interface) it would be a serious security breach.

OTOH if the assumption is that PSP is always running trusted code, it is
possible that the game can influence the MMU and there are no security
checks at all. I forgot that the whole ability of running untrusted code
on 1.0 was a bug, and not something planned, so interfaces would not need
be so tight.

By the way, all PSPs you can buy now, except early Japanese version, are
1.5 or higher so the whole point of having a MMU interface is moot
because, as of now, you can't run anything on it at all. Not even a hello

Anyway, I'm going to take one apart :)


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