Software management systems and methods for automotive computing devices

• US 6,904,494 B2
• Filed: 05/27/2004
• Issued: 06/07/2005
• Est. Priority Date: 12/20/2000
• Status: Expired due to Term

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Drasnin, Sharon, Radko, Ronald Otto, Beckert, Richard Dennis
• Primary Examiner(s): BRAGDON, REGINALD GLENWOOD
• Application Number:
  US10/856,081
• Publication Number:
  US 20040221124A1
• Time in Patent Office: 376 Days
• Field of Search: 711/103, 711/104, 711/105, 711/206, 711/207, 711/159, 711/160, 711/133, 711/165
• US Class Current: 711/103
• CPC Class Codes: G06F 11/1441 Resetting or repowering
• CPC Class Codes: G06F 11/2015 Redundant power supplies power supply failure G06F1/30
• CPC Class Codes: G06F 12/08 in hierarchically structured memory systems, e.g. virtual memory systems
• CPC Class Codes: G06F 12/1009 using page tables, e.g. page table structures
• CPC Class Codes: G06F 12/1027 using associative or pseudo-associative address translation means, e.g. translation look-aside buffer [TLB]
• CPC Class Codes: G06F 12/122 of the least frequently used [LFU] type, e.g. with individual count value
• CPC Class Codes: G06F 2212/2022 Flash memory

Abstract

Programmable automotive computing devices and methods are described. In but one embodiment, the automotive computing device is programmed to copy an object store into device flash memory and to create an object store page table in device SRAM that is configured to track the locations of all of the object store pages in the device.

Claims

1. A programmable automotive computing device programmed with instructions which, when executed by the automotive computing device, cause the computing device to:

copy an object store into device flash memory; and

create an object store page table in device SRAM that is configured to track the locations of all of the object store pages in the device.

2. The automotive computing device of claim 1, wherein the instructions cause the computing device to initialize the object store page table to indicate that object store pages are located in flash memory and are read only pages.

3. The automotive computing device of claim 1, wherein the instructions cause the computing device to:

page object store pages between and among the flash memory, device DRAM and the SRAM; and

update the object store page table to reflect new locations of the paged object store pages.

4. The automotive computing device of claim 3, wherein the instructions cause the computing device to page object store pages from the flash memory to the DRAM responsive to a read access of the object store page.

5. The automotive computing device of claim 4, wherein the instructions cause the computing device to maintain a copy of one or more paged pages in the flash memory in the event of a power loss.

6. The automotive computing device of claim 3, wherein the instructions cause the computing device to page object store pages from the DRAM to the SRAM responsive to a write access of the object store page.

7. The automotive computing device of claim 3, wherein the instructions cause the computing device to page object store pages from the SRAM to the flash memory in a predetermined manner to make room for additional object store pages.

8. The automotive computing device of claim 1, wherein the instructions cause the computing device to use the object store page table to track whether an object store page is dirty.

9. The automotive computing device of claim 1, wherein the instructions cause the computing device to use the object store page table to track the number of times an object store page has been written to flash memory.

10. The automotive computing device of claim 9, wherein the instructions cause the computing device to use said number to determine when to write a page from the SRAM into the flash memory.

11. An automobile embodying the automotive computing device of claim 1.

12. In an automotive computing device, a method comprising:

booting the computing device; and

responsive to said booting, processing an object store page table that is maintained in battery-backed SRAM, the object store page table being configured to track locations of all object store pages in the device, said processing comprising changing any entries in the object store page table that indicate an object store page is in device DRAM to an entry that indicates that the object store page is in device flash memory.

13. An automotive computing device programmed with instructions which, when executed by the device, implement the method of claim 12.

14. An automobile embodying an automotive computing device programmed with instructions which, when executed by the device, implement the method of claim 12.