hello, I have read the "read me " ,she said " Since there are no ISR's installed for this target, you will either get a system call message window from the debugger, or it will branch to the location of
the system call interrupt vector, depending on your debug protocol. " but I do have a ISR ,maybe I should like this initialize the Exception like this:
__init_user:
/* init interrupts */
/* --------------- */
/* IVPR =0x00000000 - default reset value */
/* IVOR0 - Critical input */
lis r5, 0x0000
ori r5, r5, 0x0A00
mtspr 400, r5
/* IVOR1 - machine check */
lis r5, 0x0000
ori r5, r5, 0x0200
mtspr 401, r5
/* IVOR2 - data storage (DSI) */
lis r5, 0x0000
ori r5, r5, 0x0300
mtspr 402, r5
/* IVOR3 - instruction storage (ISI) */
lis r5, 0x0000
ori r5, r5, 0x0400
mtspr 403, r5
/* IVOR4 - external input */
lis r5, 0x0000
ori r5, r5, 0x0500
mtspr 404, r5
/* IVOR5 - alignment */
lis r5, 0x0000
ori r5, r5, 0x0600
mtspr 405, r5
/* IVOR6 - program */
lis r5, 0x0000
ori r5, r5, 0x0700
mtspr 406, r5
/* IVOR8 - system call */
lis r5, 0x0000
ori r5, r5, 0x0c00
mtspr 408, r5
/* IVOR10 - decrementer */
lis r5, 0x0000
ori r5, r5, 0x0900
mtspr 410, r5
/* IVOR11 - fixed-interval timer interrupt */
lis r5, 0x0000
ori r5, r5, 0x0f00
mtspr 411, r5
/* IVOR12 - watchdog timer interrupt */
lis r5, 0x0000
ori r5, r5, 0x0b00
mtspr 412, r5
/* IVOR13 - data TLB errror */
lis r5, 0x0000
ori r5, r5, 0x1100
mtspr 413, r5
/* IVOR14 - instruction TLB error */
lis r5, 0x0000
ori r5, r5, 0x1000
mtspr 414, r5
/* IVOR15 - debug */
lis r5, 0x0000
ori r5, r5, 0x1500
mtspr 415, r5
/* IVOR32 - SPE-APU unavailable */
lis r5, 0x0000
ori r5, r5, 0x1600
mtspr 528, r5
/* IVOR33 - SPE-floating point data exception */
lis r5, 0x0000
ori r5, r5, 0x1700
mtspr 529, r5
/* IVOR34 - SPE-floating point round exception */
lis r5, 0x0000
ori r5, r5, 0x1800
mtspr 530, r5
/* IVOR35 - performance monitor */
lis r5, 0x0000
ori r5, r5, 0x1900
mtspr 531, r5
blr
and in the interrupt vector to call the ISR
##############################################################################
#
# 0x0900 Decrementer
#
##############################################################################
.org base_add + 0x900
IntPrologue
ba DECIntr
epilogue
##############################################################################
#
# 0x0C00 System Call
#
##############################################################################
.org base_add + 0xC00
IntPrologue
ba XXXXX
epilogue
##############################################################################
Am I right? thanks for your help!!