Patching device for a processor
US7844962B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 4, 2005 |
| Grant date | Nov 30, 2010 |
| Priority date | — |
| Expiry date | Jul 20, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F12/0638
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A code patching device is provided for use with a processor having a read-only memory which stores instruction code and a further memory for storing patch code. A plurality of patch address registers each store an address, in the read-only memory, at which a patch is to be performed. A comparator compares the address of the read-only memory that is being accessed by the processor with the addresses stored in the registers. A control unit selects between code from the read-only memory or patch code from the further memory depending on the comparison. The code patching device can replace, on-the-fly, erroneous lines of code from the read-only memory by corrected ones. During an initialization process the patch code is loaded into the further memory and the registers are loaded with the addresses which require patching.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.