| 摘要 |
<p>There is provided a firmware updating technique for which consumed memory and writing time are small for devices subject to a firmware update, for which the distributed update size is small, and which is performed via a broadcast network. To this end, assuming that the latest firmware version is N, there is provided a means that extracts differences between firmware of version j-i and firmware of version i (j-1†’j differences) for j = 2 to N, and that distributes these differences together via the broadcast network. With respect to a device subject to an update comprising firmware of version i, there is provided a means that saves, of the distributed j-1†’j differences (where 2 ‰¤ j ‰¤ N), only the differences for which j < i in a storage area, generates an i†’N difference based on the saved j-1†’j differences (where i ‰¤ j ‰¤ N), and updates the firmware in flash memory based on the content of the i†’N difference (see Figure 1 ).</p> |
