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by james
Wed Jun 13, 2012 8:41 pm
Forum: C/C++
Topic: GPU Processing API
Replies: 124
Views: 49628

Re: GPU Processing API

cheery wrote:You call that complex? That graph has very few edges.
Heh. He called the device complex, not that high level abstraction was complex.
Eg. a graph with a single node that says "Life" is not complex - but says nothing about the subject matter it models :)
by james
Wed Jun 13, 2012 3:07 am
Forum: C/C++
Topic: GPU Processing API
Replies: 124
Views: 49628

Re: GPU Processing API

And yet, by keeping these things secret, the Broadcom Videocore is still the lowest power per performance rating GPU you can get. So there is, indeed, magic sauce. I'm not saying you can infer the complete technology from the instructions sets, but what you can infer is how the chip is partitioned,...
by james
Sat Feb 25, 2012 8:42 am
Forum: General discussion
Topic: Lima Project To Reverse Engineer ARM GPUs
Replies: 34
Views: 9520

Re: Lima Project To Reverse Engineer ARM GPUs

<r>In terms of reverse engineering, I've had a glance thru the closed source drivers on the linux side.<br/> <br/> They look fairly easy to lift across to another runtime.  I mainly spot crt, pthreads, and communication via rpc_send_*.  I dont see any heavy lifting in the drivers - which would be in...
by james
Sat Nov 05, 2011 2:01 am
Forum: Other projects
Topic: An OS for the R-Pi created completely in assembly
Replies: 54
Views: 18041

Re: An OS for the R-Pi created completely in assembly

<r>Quote from Lance Constable Carrot on November 4, 2011, 15:47<br/> I think it could take tens of years for a person to write an OS for a device so sophisticated as the RPI processor, that's the reason why an open source OS is being used to run it instead of writting one from scratch.<br/> I think ...
by james
Fri Nov 04, 2011 2:19 pm
Forum: Other projects
Topic: An OS for the R-Pi created completely in assembly
Replies: 54
Views: 18041

Re: An OS for the R-Pi created completely in assembly

<t>I think an assembly based OS is a good idea - both as a tool for learning about how to make an OS, but also I think an advanced monitor that lets people dig into the system and single step everything. I think there is no substitute for letting beginners dig in and reverse engineer how other peopl...
by james
Fri Sep 02, 2011 2:35 pm
Forum: General discussion
Topic: STICKY: Introduce yourself!
Replies: 3713
Views: 206662

Re: Introduce yourself!

<t>Hi, I'm James. Research Manager by day, bit dabbler by night.<br/> Excited by R-PI for the opportunity it offers a new generation to learn hardware/software from bare metal upwards.<br/> <br/> My background, Apple II - games and a little basic, BBC Micro Model B - 6502, lisp, Amiga 1000 - 68k, Ar...
by james
Thu Aug 04, 2011 5:20 am
Forum: General discussion
Topic: Secure Boot / OTP / Encrypted Boot
Replies: 15
Views: 9762

Re: Secure Boot / OTP / Encrypted Boot

<t>My experience having worked on some secure boot chains commercially is that the "obscurity" portion only exists with regards to business strategy, hiding weak designs or physical security (eg. not giving away too much about the physical structure to prevent Christopher Tarnovsky style attacks).<b...
by james
Wed Aug 03, 2011 11:12 am
Forum: General discussion
Topic: Secure Boot / OTP / Encrypted Boot
Replies: 15
Views: 9762

Re: Secure Boot / OTP / Encrypted Boot

Gotcha. Yeah I should have been clearer. I'm after software-protection / tamper-resistance scenario (ala xbox/STB/ps etc). Rather than Privacy protection ala On-The-Fly-Encryption like Truecrypt, or something like TAILS (https://tails.boum.org/).
by james
Wed Aug 03, 2011 6:32 am
Forum: General discussion
Topic: Any plans to support WindowsCE?
Replies: 32
Views: 6544

Re: Any plans to support WindowsCE?

<t>I think you will find WinXPe is not available for ARM. Even if it was, would you really be interested in paying $75-85 USD for each unit? Also you need to look deeper in the Ecosystem. WinXP is essentially a x86 ecosystem with all the components that do heavy lifting (video decode, graphics trans...
by james
Wed Aug 03, 2011 1:57 am
Forum: General discussion
Topic: Secure Boot / OTP / Encrypted Boot
Replies: 15
Views: 9762

Re: Secure Boot / OTP / Encrypted Boot

<t>Thanks ShiftPlusOne for your conjecture -- what you describe is how later stages of some chains of trust work. However without a stronger root of trust (eg hardware sealed encrypted boot loader), it only takes minutes to extract the key from the plaintext boot loader and decrypt the root fs.<br/>...
by james
Tue Aug 02, 2011 5:53 am
Forum: General discussion
Topic: Secure Boot / OTP / Encrypted Boot
Replies: 15
Views: 9762

Re: Secure Boot / OTP / Encrypted Boot

<r>Very interesting design!<br/> <br/> For embedded applications, I'm interested in what facilities the chip has for booting from encrypted code/text.<br/> <br/> I'm assuming its a broadcom device going by a few indicators <E>:-)</E><br/> <br/> Is there support for setting boot encryption keys in OT...

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