[ECOS] Patch for packages\hal\arm\arch\current\src\vectors.S

["wang cui" <iucgnaw at msn dot com>]

According to LPC2XXX datasheet, checksum of all 8 vectors value must be 
zero, which means Reserved Vector value must be the inversed value of sum 
of other 7 vectors value, so we must compute it before compile and place 
the hardnumber in it.

Actually, when download hex file to LPC2XXX board through ISP, if the 
Reserved Vector is not valid, the ISP program changes this vector to a 
checksum number automatically, and cause error when verify the flash. 

So I modified the vectors.s to resolve it.

***current code***
       .global __exception_handlers
__exception_handlers:
#ifdef CYGSEM_HAL_ROM_RESET_USES_JUMP
// Assumption:  ROM code has these vectors at the hardware reset address.
// A simple jump removes any address-space dependencies [i.e. safer]
       b       reset_vector                    // 0x00
#else        
       ldr     pc,.reset_vector                // 0x00
#endif        
       ldr     pc,.undefined_instruction       // 0x04
       ldr     pc,.software_interrupt          // 0x08 start && software 
int
       ldr     pc,.abort_prefetch              // 0x0C
       ldr     pc,.abort_data                  // 0x10
       .word   0                               // unused
       ldr     pc,.IRQ                         // 0x18
       ldr     pc,.FIQ                         // 0x1C

***modified code***
       .global __exception_handlers
__exception_handlers:
#ifdef CYGSEM_HAL_ROM_RESET_USES_JUMP
// Assumption:  ROM code has these vectors at the hardware reset address.
// A simple jump removes any address-space dependencies [i.e. safer]
       b       reset_vector                    // 0x00
#else        
       ldr     pc,.reset_vector                // 0x00
#endif        
       ldr     pc,.undefined_instruction       // 0x04
       ldr     pc,.software_interrupt          // 0x08 start && software 
int
       ldr     pc,.abort_prefetch              // 0x0C
       ldr     pc,.abort_data                  // 0x10
#ifdef CYGPKG_HAL_ARM_LPC2XXX
#ifdef CYGSEM_HAL_ROM_RESET_USES_JUMP
       .word   0xB4405F62                      // checksum of other 
vectors
#else        
       .word   0xB8A06F58                      // checksum of other 
vectors
#endif        
#else
       .word   0                               // unused
#endif
       ldr     pc,.IRQ                         // 0x18
       ldr     pc,.FIQ                         // 0x1C

Should it be patched ?



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