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-rw-r--r--src/lpc11xx.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/lpc11xx.c b/src/lpc11xx.c
index 01afd87..670bba8 100644
--- a/src/lpc11xx.c
+++ b/src/lpc11xx.c
@@ -216,7 +216,7 @@ lpc11xx_flash_write(struct target_s *target, uint32_t dest, const uint8_t *src,
chunk_offset = 0;
/* if we are programming the vectors, calculate the magic number */
- if (dest == 0) {
+ if (chunk * IAP_PGM_CHUNKSIZE == 0) {
uint32_t *w = (uint32_t *)(&flash_pgm.data[0]);
uint32_t sum = 0;