iso_val_entry_t *pve = (iso_val_entry_t *)tmpbuf;
iso_init_def_entry_t *pide;
+ if (dev_desc->blksz != CD_SECTSIZE)
+ return -1;
+
/* the first sector (sector 0x10) must be a primary volume desc */
blkaddr=PVD_OFFSET;
if (dev_desc->block_read (dev_desc->dev, PVD_OFFSET, 1, (ulong *) tmpbuf) != 1)