System and method for modem-directed application processor boot flow

A method for a modem-directed application processor boot flow in a portable computing device (“PCD”), the method comprising:

• a. initializing a direct memory access (“DMA”) engine, wherein the DMA engine is configured to read data from a memory component;
• b. initializing a crypto engine, wherein the crypto engine is configured to calculate a hash according to a predetermined hash function;
• c. reading with the DMA engine metadata associated with an image stored in the memory component;
• d. transitioning an application processor from an active processing state into an idle state;
• e. calculating with the crypto engine a hash value associated with the metadata;
• f. authenticating the metadata by validating the hash value and a signature associated with the metadata;
• g. reading with the DMA engine a current segment of the image;
• h. transitioning the application processor from an active processing state to an idle state;
• i. calculating with the crypto engine a hash value associated with the current segment of the image;
• j. reading with the DMA engine a next segment of the image;
• k. authenticating the current segment of the image by validating the hash value and a signature associated with the current segment of the image;
• l. transitioning the application processor from an active processing state to an idle state;
• m. receiving with the application processor the next segment of the image from the DMA engine;
• n. calculating with the crypto engine a hash value associated with the next segment of the image;
• and
• o. repeating actions j through n until a last segment of the image is authenticated and then bringing a subsystem out of reset.

A computer system for modem-directed application processor boot sequence in a portable computing device (“PCD”), the system comprising:

• an application processor configured to:
• initialize a direct memory access (“DMA”) engine for the boot sequence, wherein the DMA engine is configured to read data from a memory component;
• initialize a crypto engine for the boot sequence, wherein the crypto engine is configured to calculate a hash according to a predetermined hash function;
• instruct the DMA engine to read metadata and data segments associated with an image stored in the memory component and associated with the boot sequence;
• instruct the crypto engine to calculate hash values associated with the metadata and data segments;
• and
• transition into an idle state for durations of time coinciding with at least one of reading by the DMA engine and calculating by the crypto engine.

A computer system for modem-directed application processor boot flow in a portable computing device (“PCD”), the system comprising:

• an application processor configured to:
• a. initialize a direct memory access (“DMA”) engine, wherein the DMA engine is configured to read data from a memory component;
• b. initialize a crypto engine, wherein the crypto engine is configured to calculate a hash according to a predetermined hash function;
• c. instruct the DMA engine to read metadata associated with an image stored in the memory component;
• d. transition an application processor from an active processing state into an idle state;
• e. instruct the crypto engine to calculate a hash value associated with the metadata;
• f. authenticate the metadata by validating the hash value and a signature associated with the metadata;
• g. instruct the DMA engine to read a current segment of the image;
• h. transition the application processor from an active processing state to an idle state;
• i. instruct the crypto engine to calculate a hash value associated with the current segment of the image;
• j. instruct the DMA engine to read a next segment of the image;
• k. authenticate the current segment of the image by validating the hash value and a signature associated with the current segment of the image;
• l. transition from an active processing state to an idle state;
• m. receive the next segment of the image from the DMA engine;
• n. instructing the crypto engine to calculate a hash value associated with the next segment of the image;
• and
• o. repeat actions j through n until a last segment of the image is authenticated and then bring a subsystem out of reset.

A computer system for a modem-directed application processor boot sequence in a portable computing device (“PCD”), the system comprising:

• means for initializing a direct memory access (“DMA”) engine for the boot sequence, wherein the DMA engine is configured to read data from a memory component;
• means for initializing a crypto engine for the boot sequence, wherein the crypto engine is configured to calculate a hash according to a predetermined hash function;
• means for instructing the DMA engine to read metadata and data segments associated with an image stored in the memory component and associated with the boot sequence;
• means for instructing the crypto engine to calculate hash values associated with the metadata and data segments;
• and
• means for transitioning an application processor into an idle state for durations of time coinciding with at least one of reading by the DMA engine the metadata and calculating by the crypto engine during the boot sequence.

A computer system for a modem-directed application processor boot flow in a portable computing device (“PCD”), the method comprising:

• a. means for initializing a direct memory access (“DMA”) engine, wherein the DMA engine is configured to read data from a memory component;
• b. means for initializing a crypto engine, wherein the crypto engine is configured to calculate a hash according to a predetermined hash function;
• c. means for instructing the DMA engine to read metadata associated with an image stored in the memory component;
• d. means for transitioning an application processor from an active processing state into an idle state;
• e. means for instructing the crypto engine to calculate a hash value associated with the metadata;
• f. means for authenticating the metadata by validating the hash value and a signature associated with the metadata;
• g. means for instructing the DMA engine to read a current segment of the image;
• h. means for transitioning the application processor from an active processing state to an idle state;
• i. means for instructing the crypto engine to calculate a hash value associated with the current segment of the image;
• j. means for instructing the DMA engine to read a next segment of the image;
• k. means for authenticating the current segment of the image by validating the hash value and a signature associated with the current segment of the image;
• l. means for transitioning the application processor from an active processing state to an idle state;
• m. means for receiving the next segment of the image from the DMA engine;
• n. means for instructing the crypto engine to calculate a hash value associated with the next segment of the image;
• and
• o. means for repeating actions j through n until a last segment of the image is authenticated and then bringing a subsystem out of reset.

A computer program product comprising a non-transitory computer usable medium having a computer readable program code embodied therein, said computer readable program code adapted to be executed to implement a method for a modem-directed application processor boot sequence in a portable computing device (“PCD”), said method comprising:

• initializing a direct memory access (“DMA”) engine for the boot sequence, wherein the DMA engine is configured to read data from a memory component;
• initializing a crypto engine for the boot sequence, wherein the crypto engine is configured to calculate a hash according to a predetermined hash function;
• reading with the DMA engine metadata and data segments associated with an image stored in the memory component and associated with the boot sequence;
• calculating with the crypto engine hash values associated with the metadata and data segments;
• and
• transitioning an application processor into an idle state for durations of time coinciding with at least one of reading with the DMA engine during the boot sequence and calculating with the crypto engine during the boot sequence.

A computer program product comprising a non-transitory computer usable medium having a computer readable program code embodied therein, said computer readable program code adapted to be executed to implement a method for a modem-directed application processor boot flow in a portable computing device (“PCD”), said method comprising:

• a. initializing a direct memory access (“DMA”) engine, wherein the DMA engine is configured to read data from a memory component;
• b. initializing a crypto engine, wherein the crypto engine is configured to calculate a hash according to a predetermined hash function;
• c. reading with the DMA engine metadata associated with an image stored in the memory component;
• d. transitioning an application processor from an active processing state into an idle state;
• e. calculating with the crypto engine a hash value associated with the metadata;
• f. authenticating the metadata by validating the hash value and a signature associated with the metadata;
• g. reading with the DMA engine a current segment of the image;
• h. transitioning the application processor from an active processing state to an idle state;
• i. calculating with the crypto engine a hash value associated with the current segment of the image;
• j. reading with the DMA engine a next segment of the image;
• k. authenticating the current segment of the image by validating the hash value and a signature associated with the current segment of the image;
• l. transitioning the application processor from an active processing state to an idle state;
• m. receiving with the application processor the next segment of the image from the DMA engine;
• n. calculating with the crypto engine a hash value associated with the next segment of the image;
• and
• o. repeating actions j through n until a last segment of the image is authenticated and then bringing a subsystem out of reset.

A method for a modem-directed application processor boot sequence in a portable computing device (“PCD”) and in remote communication with a server, the method comprising:

• forming a network of one or more Internet of Things (IoT) devices, the PCD being one of the IoT devices;
• a modem of the PCD receiving an instruction from the remote server;
• the modem sending a wakeup signal to an application processor to execute a boot sequence;
• the application processor initializing a direct memory access (“DMA”) engine for the boot sequence, wherein the DMA engine is configured to read data from a memory component;
• the application processor initializing a crypto engine for the boot sequence, wherein the crypto engine is configured to calculate a hash according to a predetermined hash function;
• the DMA engine reading metadata and data segments associated with an image stored in the memory component and associated with the boot sequence;
• the crypto engine calculating hash values associated with the metadata and data segments;
• and
• the application processor transitioning into an idle state for durations of time coinciding with at least one of reading with the DMA engine during the boot sequence and calculating with the crypto engine during the boot sequence.

A computer system for modem-directed application processor boot sequence in a portable computing device (“PCD”), the system comprising:

• a remote server in communication with one or more Internet of Things (IoT) devices;
• the PCD comprising one of the IoT devices and having a modem configured to receive instructions from the remote server and, in response to the instructions, cause an application processor within the PCD to execute a boot sequence, the application processor configured to:
• initialize a direct memory access (“DMA”) engine for the boot sequence, wherein the DMA engine is configured to read data from a memory component;
• initialize a crypto engine for the boot sequence, wherein the crypto engine is configured to calculate a hash according to a predetermined hash function;
• instruct the DMA engine to read metadata and data segments associated with an image stored in the memory component and associated with the boot sequence;
• instruct the crypto engine to calculate hash values associated with the metadata and data segments;
• and
• transition into an idle state for durations of time coinciding with at least one of reading by the DMA engine and calculating by the crypto engine.