BWI_FWHDR_SZ
fw = (const uint32_t *)(mac->mac_ucode + BWI_FWHDR_SZ);
fw_len = (mac->mac_ucode_size - BWI_FWHDR_SZ) / sizeof(uint32_t);
fw = (const uint32_t *)(mac->mac_pcm + BWI_FWHDR_SZ);
fw_len = (mac->mac_pcm_size - BWI_FWHDR_SZ) / sizeof(uint32_t);