doc: update virtio-blk usage in HLD
Add parameters introduction for virtio-blk
@@ -530,7 +530,25 @@ VTBLK_F_TOPOLOGY(bit 10)
To use the virtio-blk device, use the following virtio command::
- -s <slot>,virtio-blk,<filepath>
+ -s <slot>,virtio-blk,<filepath>[,options]
+
+ options:
+
+ writethru: write operation is reported completed only when the
+ data has been written to physical storage.
+
+ writeback: write operation is reported completed when data is
+ placed in page cache. Needs to be flushed to the physical storage.
+
+ ro: open file with readonly mode.
+
+ sectorsize:
+ 1> sectorsize=<sector size>/<physical sector size>
+ 2> sectorsize=<sector size>
+ default values for sector size and physical sector size are 512
+
+ range:
+ range=<start lba in file>/<sub file size>
Successful booting of the User OS verifies the correctness of the
device.
