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Boot and run blinky example in bank1

Used target = MCB-STR9 + µVision3.50 from Keil.

I tried to build the blinky example to boot and run in flash bank 1.
In the "STR910 Flash with CFG", I changed, using the configuration wizard following items :

FLASH MEMORY INTERFACE (in STR91x.s)
Flash bank 0 Enable = true BBSize = 512KB BBADD = 0x800000

Flash bank 1 enable = true NBBSIZE = 32K NBADDR = 0x00000 (<= remapped this on address 0 to boot)

CONFIGURATION (in STR91xCFG.s)
CSX (Chip select mapping) = true (<= switch boot sector)

The result is that the JTAG is blocked. I get the error 'could not stop ARM device'. Even erasing immediatly after reset is not possible.
This is the second time this happens. The first time i did replace the STR9 device. Now I did order a RLINK device. I hope this works for erasing it !

My question :
WHAT IS WRONG WITH ABOVE SETTINGS ?

Thanks
Luc