Bootstrap loading from external memory including disabling a reset from a keyboard controller while an operating system load signal is active
US5410707A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 1, 1994 |
| Grant date | Apr 25, 1995 |
| Priority date | — |
| Expiry date | Mar 1, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/023
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A computer system bootstrap loads a processor and associated memory from an external memory device instead of being bootstrap loaded from on-board read only memory. The computer system is comprised of a system bus, a processing component, a first system memory device, a memory card interface controller, and an external memory device connected to the memory card interface controller. The system also includes a second system memory device, a keyboard memory device, a keyboard controller and a reset switch for causing a reset and initialization of the processing component. Upon reset, the logic in the memory card interface controller remaps the address space associated with the first system memory device to the external memory device and remaps the address space associated with the second system memory device to the keyboard memory device. This remapping redirects execution control of the processing component to the external memory device and allows the keyboard memory device to be loaded and verified by the processing component. The keyboard controller is held in a reset state. Once the keyboard memory device and local random access memory has been loaded from the external memory dev…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.