JTAG and the Echostar AD3000Information exchange on digital satellite systems other than Sky | |
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JTAG and the Echostar AD3000Information exchange on digital satellite systems other than Sky | |
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31-05-2009
| #1 | ||
| cerca trova...  Join Date: 01-01-2000 Location: East Anglia
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Blog Entries: 1 My System: Triple Dragon with HDD/USB stick, Dreambox 8000, Humax HDCI2000, Echostar AD3000ip & SR8700, Aston Simba, RSD ODM300. Swedish Microwave 1.2 Motorised dish / Invacom C120 twin LNB driven by the AD3000. 3 other fixed dishes.  Fighting the evil 3 Dragons under the Don Quixote banner,Sir Llew persevered where others failed |
Maybe I'm wrong, but received opinion on this and other forums suggest that jtagging the AD3000 to access the EEPROM is not possible. Usually, in cases where the EEPROM is corrupt, the box must be sent away for repair, or the chip removed and either replaced, or as I understand it, erased and loaded with a working dump file. I have now jtagged the CPU and can read the registers. The IBM CPU's core is a ppc401d2. The JTAG connector uses the 16-pin layout for this core, and I pinned the board's JTAG pads with 2x 8-way header plugs. This enabled me to interface with a Raven programmer, using the free Magraigor OCD Commander programme. I now need to access the EEPROM (an Atmel 49BV1614) through the CPU, but this is not trivial, as the JTAG software I have at the moment returns various errors when trying this. This project is really just for my satisfaction, but if it is possible maybe it will remove the need for taking the chip out if it can be reprogrammed 'through the back door' so to speak. Llew | ||
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31-05-2009
| #2 | ||
| Amo Amas Amant Admin  Join Date: 18-11-2004 Location: Blackburn NW England (Siberia)
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My System: IDD CI24 ECONO MM Penta 1.20 Galaxy II 1.2Mtr Polar MTG yes it has been on the arc for 21 years and is still driven by a modified wiper motor from a Ford Anglia. It's like me sometimes groans but always performs  Saved us from the black plague of ignoratio elenchi, he awaits a special badge with jugs |
That sounds interesting Llew, I don't have the patience for such investigations myself, it does sound as though you may succeed where others have failed I do not know what info you have Llew but this document has some detail about the hardware reset pin 12 on the Atmel 49BV1614 | ||
| War does not determine who is right, it determines who is left! Formerly toppervte33h whose six pack has turned into a keg Help support this web site by making a donation Or use other options to help support Sats UK Show Your Support by clicking the button Thank you. Freddie Flintoff is back | |||
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31-05-2009
| #3 | ||
| cerca trova... Join Date: 01-01-2000 Location: East Anglia
Posts: 6260
Thanks: 37
Thanked 412 Times in 375 Posts
Blog Entries: 1 My System: Triple Dragon with HDD/USB stick, Dreambox 8000, Humax HDCI2000, Echostar AD3000ip & SR8700, Aston Simba, RSD ODM300. Swedish Microwave 1.2 Motorised dish / Invacom C120 twin LNB driven by the AD3000. 3 other fixed dishes. Fighting the evil 3 Dragons under the Don Quixote banner,Sir Llew persevered where others failed | Yes thanks Topper, I'll add that to my files. All operations on the chip should be able to be performed through the CPU, I just need to get the CPU to 'see' the EEPROM first. My JTAG software recognises the Atmel chip, but as I say errors occur when trying to read through the CPU. Llew | ||
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