Hi John, On Friday 30 May 2008 03:14, John Zhou wrote: > Hi, > > We want to design a tool to speed up our hardware diagnostics via JTAG > port. > > So we have question to ask for your help: > > 1. How do we access PowerPC's internal GPRs and SPRs etc. via JTAG > instruction? > > We'v gone through IEEE.1149.1. There are no standard JTAG instruction to > access CPU's data bus, including internal or external data bus. Do we must > need private JTAG instruction to access CPU's internal resource?
That's right. > if it is, could you share the documents with us? No public documentation is available. You will need to sign an NDA with Freescale (and probably pay $$$$). I had to design a test bench to program the flash memory on our MPC8248-based hardware, and ended up using JTAG to bitbang the bus signals. Programming the processor through JTAG private instructions would have been faster. > 2. For 'BSDL' usage, you know, we have many components on one board and much > more signals are processed specically. So, how to integrate PowerPC's BSDL > with other components' 'BSDL'? Could you give us any hints on it? or any > document is also welcome! > > Your any help is appreciated! Best regards, -- Laurent Pinchart CSE Semaphore Belgium Chaussee de Bruxelles, 732A B-1410 Waterloo Belgium T +32 (2) 387 42 59 F +32 (2) 387 42 75
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