PREFETCH_FIFOTHRESHOLD_MAX
if (fifo_th > PREFETCH_FIFOTHRESHOLD_MAX)
PREFETCH_FIFOTHRESHOLD_MAX, 0x0, pref_len, 0x0, info);
PREFETCH_FIFOTHRESHOLD_MAX, 0x0, len, 0x1, info);
PREFETCH_FIFOTHRESHOLD_MAX, 0x1, len, is_write, info);
PREFETCH_FIFOTHRESHOLD_MAX/2, 0x0, len, 0x0, info);
(PREFETCH_FIFOTHRESHOLD_MAX * 3) / 8, 0x0, len, 0x1, info);