Eeprom And Flash Experiments
Posted 05 December 2005 - 02:35 AM
Some news on the XBH forums, posted by cjack (see the xboxhacker.net frontpage for news items):
-Two systems, Core with EEPROM, Premium w/o EEPROM...
And some of cjack's experiments:
Uff, just desoldered the tsop of my two x360 and inverted
Tsop of Premium soldered on Core console .... NO GO. Ring of light blinked red ... black screen.
Just resoldered the tsops in correct consoles....everything ok, consoles works fine. Just an experiment...more to come.....
Some other interesting findings:
1)Just desoldered the eeprom from my x360 core and......ehehehehhe....the console works fine without the eeprom too!!!!! Dashboard version and Kernel versions (backup version too) are the same of when there was the eeprom.... Everything works fine, games boots without problems....xbox live too......
2)I have swapped the dvd players just for fun and ..... the games won't boot....x360 tell you "To play this disc, put it in an xbox 360 console". So I think that x360 have some kind of segnature of his dvd player and won't boot games without it!
More exps to come
(if you come over to XBH, remember -- the "Technical" section of the boards are for serious technical discussion and work only, think before posting thanks! :-) )
Posted 05 December 2005 - 05:10 AM
why your saying keep it simple when some off the best things come from out of this world ideas responses and jokes
Posted 08 January 2006 - 08:16 AM
Edited by cpuengineer, 08 January 2006 - 09:08 AM.
Posted 08 January 2006 - 09:34 AM
1. The 25020AN has a SDO and SDI. The JTAG interface demands TDI and TDO.
2. Also, why would MS interface a 20Mhz chip with a 3.2Ghz processor....
3. Some models have it but others dont due to lack of need for debug circuitry...
4. A 6 pin header test socket right next to the 25020AN chip.
OMG. THIS HAS TO BE JTAG!!!
Picture of flash and socket:
Check it out these engineering articles about JTAG...
Edited by cpuengineer, 08 January 2006 - 09:35 AM.
Posted 18 January 2006 - 07:14 PM
IBM's DeveloperWorks website has published a paper on the Xbox 360 CPU. The paper offers an introductory yet technical look at the chip's design and development process, core architecture, frontside bus architecture, debugging interfaces, and more. It was given by Chief Engineer Jeff Brown at the Fall Processor Forum.
According to Brown, the Xbox 360 processor project involved demanding requirements for performance, cost, and production deadlines. Brown's team jumpstarted development by leveraging existing PowerPC and subsystem technology, he says.
The Xbox 360 chip uses three of the fastest-available (3.2 GHz) PowerPC cores, in a cache-coherent symmetrical multiprocessing architecture with a 1MB L2 cache and a frontside/physical bus speed of 5.4 GHz. In addition to supporting the full 64-bit PowerPC ISA (instruction set architecture), each core is specialized with "VMX128" extensions, similar to VMX instructions in G4 and G5 CPUs, Brown writes.
The chip offers a variety of debugging features, including JTAG, a POST monitor, and a serial EEPROM interface. It also uses extensive clock gating to save power.
Though labeled "introductory" by DeveloperWorks, Brown's article offers considerable technical detail about the Xbox 360's cores, debugging facilities, frontside bus architecture, and more. Read Brown's Xbox 360 whitepaper here.
Posted 20 May 2006 - 03:40 PM
Posted 20 September 2006 - 12:29 PM
Has anyone recorded the revision code of the processor for systems with and without the EEPROM?
I would guess the serial EEPROM stores microcode patches required for early versions of the processor that have bugs. Later versions (with the bugs fixed) don't need the EEPROM.
Posted 24 September 2006 - 02:50 AM
Uh... stupid question but doesn't XBL bans require you to have an eeprom?
Posted 26 September 2006 - 12:10 PM
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