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2.2 Programmers accepting extended parameters

JTAG ICE mkII
AVR Dragon
When using the JTAG ICE mkII or AVR Dragon in JTAG mode, the following extended parameter is accepted:
jtagchain=UB,UA,BB,BA
Setup the JTAG scan chain for UB units before, UA units after, BB bits before, and BA bits after the target AVR, respectively. Each AVR unit within the chain shifts by 4 bits. Other JTAG units might require a different bit shift count.

AVR910
The AVR910 programmer type accepts the following extended parameter:
devcode=VALUE
Override the device code selection by using VALUE as the device code. The programmer is not queried for the list of supported device codes, and the specified VALUE is not verified but used directly within the T command sent to the programmer. VALUE can be specified using the conventional number notation of the C programming language.
no_blockmode
Disables the default checking for block transfer capability. Use no_blockmode only if your AVR910 programmer creates errors during initial sequence.