[Matrix]: read external data with direct I/O
[Matrix]: read external data with direct I/O

icoming/FlashX,icoming/FlashX,zheng-da/FlashX,icoming/FlashX,icoming/FlashX,zheng-da/FlashX,flashxio/FlashX,flashxio/FlashX,icoming/FlashX,flashxio/FlashX,flashxio/FlashX,flashxio/FlashX,zheng-da/FlashX,zheng-da/FlashX,zheng-da/FlashX,flashxio/FlashX