Re: [avr-chat] Re: AVR in Jtag Chain (was: Programmer for everyone!)

[Uwe Bonnes]

>>>>> "Steve" == Steve Franks <address@hidden> writes:

    >> (*) Programming of an AVR in a JTAG chain isn't possible, right?!
    Steve> It's certainly supposed to work, but see my earlier posts on a
    Steve> really bad experience I had before you try it.  I'll not bring
    Steve> the details up again for fear people will believe I'm disparaging
    Steve> my favorite processor.

The ability to program parts in a JTAG chain downstream of an AVR depends on
the AVR Chip revision. See the datasheet and the errata, but don't expect
clean words about the chip revision when the bug was fixed.

With recent chips it can be done:

> detectchain -c ftdi -t ikda
JTAG loc.: 0    IDCODE: 0x0978103f      Desc: AT90CAN128        IR length: 4
JTAG loc.: 1    IDCODE: 0x05046093      Desc: XCF04S    IR length: 8
JTAG loc.: 2    IDCODE: 0x41c22093      Desc: XC3S500E  IR length: 6

-- 
Uwe Bonnes                address@hidden

Institut fuer Kernphysik  Schlossgartenstrasse 9  64289 Darmstadt
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