Signature-based sleep recovery operation flow
US9639425B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 14, 2015 |
| Grant date | May 2, 2017 |
| Priority date | — |
| Expiry date | Dec 14, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F21/73
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The present disclosure describes methods and apparatus for implementing a signature-based sleep recovery operation flow for booting a system-on-chip (SoC). When the SoC begins its normal boot flow, a controller retrieves a sleep recovery signature from a register and compares the retrieved sleep recovery signature to a default signature. If the sleep recovery signature matches the default signature, the SoC enters a ROM checksum fail debug flow and, upon satisfying the requirements of the ROM checksum fail debug flow, enters a sleep recovery boot flow, which restores the SoC to the operational state it was in prior to entering the sleep mode. If the sleep recovery signature does not match the default signature, the SoC continues with the normal boot flow or, by use of external pins, can be forced into a normal debug mode flow so that the boot code can be debugged.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.