Method for creating a memory defect map and optimizing performance using the memory defect map
A method for storing a memory defect map is disclosed whereby a memory component is tested for defects at the time of manufacture and any memory defects detected are stored in a memory defect map and used to optimize the system performance. The memory defect map is updated and the system's remapping resources optimized as new memory defects are detected during operation.
1. A method of storing a memory defect map comprising:
testing a memory component for defective memory locations;
wherein the testing is conducted when manufacturing the memory component;
storing memory defect information in a memory defect map, wherein the memory defect information is based, at least in part, on the defective memory locations;
retrieving a first target test address; and
determining whether the first target test address is included in the memory defect map corresponding to the memory component, wherein the first target test address is incremented to obtain a second target test address if it is determined that the first target test address is included in the memory defect map.
2. The method of claim 1 , wherein the memory defect map is stored on the memory component.
3. The method of claim 1 , wherein the memory component is a Dual In-Line Memory Module.
4. The method of claim 3 , wherein the memory defect map is stored in an Electrically Erasable Programmable Read-Only Memory corresponding to the Dual In-Line Memory Module.
5. The method of claim 1 , wherein the memory defect map is stored in a non-volatile memory storage.
6. The method of claim 5 , wherein the non-volatile memory storage is coupled to the memory component.
7. The method of claim 1 , wherein the memory defect map is transferable with the memory component from a first information handling system to a second information handling system.
8. The method of claim 1 , further comprising:
conducting a memory test on the first target test address if the first target test address does not contain a defective memory location.
9. The method of claim 1 , further comprising:
updating the memory defect map when a memory defect event occurs; and
mapping out a memory location indicated to be defective by the memory defect map.
10. A method of optimizing a memory test of a memory component comprising:
retrieving a first target test address;
determining whether the first target test address is included in a memory defect map corresponding to the memory component, wherein the first target test address is incremented to obtain a second target test address if it is determined that the first target test address is included in the memory defect map; and
conducting a memory test on the first target test address if the first target test address is not included in the memory defect map.
11. The method of claim 10 , wherein the memory defect map is stored on the memory component at the time of manufacture.
12. The method of claim 11 , wherein the memory component is a Dual In-line Memory Module.
13. The method of claim 12 , wherein the memory defect map is stored on an Electrically Erasable Programmable Read-Only Memory corresponding to the Dual In-Line Memory Module.
14. The method of claim 10 , further comprising:
conducting the memory test on the second target test address if the second target test address is not included in the memory defect map.
15. The method of claim 10 , wherein if the target test address is in the memory defect map the target test address is repeatedly incremented to obtain a first target test address that is not included in the memory defect map.
16. The method of claim 15 , further comprising conducting the memory test on the first target test address.
17. The method of claim 10 , further comprising updating the memory defect map if the target test address subjected to the memory test contains defective memory.
18. The method of claim 10 , wherein the memory defect map is stored in a non-volatile memory storage.