On Saturday 22 May 2010 22:31:53 Tomek CEDRO wrote: > On Sun, May 23, 2010 at 2:13 AM, Mike Frysinger wrote: > > (...) > > if your "parallel flash" device isnt actually a SPI flash but directly > > connected via address lines to the part which is controlled via JTAG, > > then you dont need SPI support. just use the existing initbus/flashmem > > commands. i program parallel flashes from time to time using this > > method. > > Yes, the memory is parallel and it is connected with data/addres > interface to the bluecore4 chip, but the chip itself does not support > JTAG.
right, but the address lines of the chip have to go somewhere. if they go to the part which you connect to via JTAG, and that part allows for wiggling of its lines via JTAG, you can talk to the chip. this is how we do it on Blackfn boards: [parallel flash (CFI]) <-- data/addr --> [Blackfin CPU] <-- JTAG --> [USB FT2232H] <-- Linux development system --> [urjtag] urjtag wiggles the Blackfin's data/addr lines that are connected to the parallel flash chip -mike
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