fill_pattern
fill_pattern(wbuf, blksz, 0x33);
static void fill_pattern(uint8_t *, size_t, uint8_t);
fill_pattern(bufs[i], NW_BLKSIZ, (uint8_t)i);
fill_pattern(wbufs[i], WWTR_BLKSIZ, (uint8_t)(0xA0 + i));
static void fill_pattern(uint8_t *, size_t, uint8_t);
fill_pattern(wbuf, blksz, 0xA0);
static void fill_pattern(uint8_t *, size_t, uint8_t);
fill_pattern(buf0, blksz, 0x20);
fill_pattern(buf1, blksz, 0x40);
static void fill_pattern(uint8_t *, size_t, uint8_t);