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Question about the SMP8634/SMP8635 MIPS processor

Subject: Question about the SMP8634/SMP8635 MIPS processor
From: Cyril HAENEL <>
Date: Wed, 28 Jan 2009 12:49:52 +0100
Original-recipient: rfc822;
User-agent: Thunderbird (X11/20090114)

I am new to the list, I recently bought a set-top-box (Netbox 8160) which uses a SMP8635 MIPS processor. The original fimware is a disaster and for fun I want to try to build my own linux based firmware for this set-to-box.

I am absolutely not afraid, because I do a lot of embedded linux at office (on ARM9 arch and Blackfin arch).

The board of this set-top-box is pretty simple, there is the SMP8635 processor, 256MB of DDRAM, 16 MB of NOR flash, mini pci with atheros wifi card, ethernet MII phy, and 2 DVB-T tuners (maybe USB2 or PCI, for now I don't now).

The SMP8635 processor comes from Sigma Design and I found on its FTP site a 2.6.15 kernel with associated patches for the SMP863x processors serie.

My problem is that they doesn't provide the datasheet alone, visibly they provide it with the SMP8634 developement board (

And to begin to developp on this board, I need at least to know where is located the JTAG. It will be the starting point to try to access the NOR flash to backup the original firmware, and play with the board. I don't see any SPI eeprom/flash thus I think even the boot loader is located the 16MB nor flash, so I thing at startup the processor directly try to execute code from the NOR, maybe at adress 0x0.

Is someone has some information on this processor ? Or maybe the datasheet ? With the datasheet I will be have to locate the JTAG pin :)

Thank you for reading my message, and sorry because my english is not perfect.

I wish you a good day



Cyril Haenel
Registered Linux User #332632

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