USDHI6_SD_BUF0
*p = usdhi6_read(host, USDHI6_SD_BUF0);
u16 d = usdhi6_read16(host, USDHI6_SD_BUF0);
usdhi6_write(host, USDHI6_SD_BUF0, *p);
usdhi6_write16(host, USDHI6_SD_BUF0, d);
cfg.dst_addr = start + USDHI6_SD_BUF0;