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bdiGDB
for GNU Debugger, BDI2000 (ARM11/Cortex-A8) User Manual 30
© Copyright 1997-2007 by ABATRON AG Switzerland V 1.04
Daisy chained JTAG devices:
For ARM targets, the BDI can also handle systems with multiple devices connected to the JTAG scan
chain. In order to put the other devices into BYPASS mode and to count for the additional bypass
registers, the BDI needs some information about the scan chain layout. Enter the number (count) and
total instruction register (irlen) length of the devices present before the ARM chip (Predecessor). En-
ter the appropriate information also for the devices following the ARM chip (Successor):
SCANPRED count irlen This value gives the BDI information about JTAG devices present before
the ARM chip in the JTAG scan chain.
count The number of preceding devices
irlen The sum of the length of all preceding instruction regis-
ters (IR).
Example: SCANPRED 1 8 ; one device with an IR length of 8
SCANSUCC count irlen This value gives the BDI information about JTAG devices present after the
ARM chip in the JTAG scan chain.
count The number of succeeding devices
irlen The sum of the length of all succeeding instruction reg-
isters (IR).
Example: SCANSUCC 2 12 ; two device with an IR length of 8+4