Tiva -TM4C LaunchPad ,how to set the Project-Options-Debugger-Setup-Driver

Feel your pain - here's an IAR 6.70 (paid) "known good" sequence targeting the older LX4F MCU:  (as we're advised that the newer devices are "near duplicates" - this may work for you - or provide some roadmap comfort...)

First - you must select your device: (note ours is different from yours)

 and then implement these preprocessor settings:

next comes the linker config:

and here's the Debugger (note we use J-Link) I've altered our setup to match yours here.  Note the yellow highlights - in use we do NOT tick that override Defaults (I've done it here so that the file name exposes for you)

now to debugger download - same story here w/override

Again your MCU is newer & different from ours.  Where possible - you should select & enter your MCU - see if that can be made to work.  Later today or tomorrow I'll run a newer device under our current (i.e. older LX4F settings) see if that works w/new device - and report.  If successful - I'll repeat the process after entering newer device - and report that operation as well...

Can now report that all settings w/in IAR's IDE-based, post above - with the exception of change from: Debugger -> TI Stellaris, to Debugger -> JLink - thus far appear to be well accepted by our new TM4C123 MCU now resident w/in our existing, custom board.  (originally intended for past, LX4F device)

Do note that the TM4C we've selected is the "replacement/duplicate" to the earlier LX4F device we employed.  There are conversion guides & data sheet markings which guide in such forward - or backward - MCU migrations.

At this time & stage in our development we are staying w/earlier StellarisWare 9453 - rather than rebrand version - as all of our past test/verification has been done based on that longer existing, & well-proven, SW package.