Electronic device having a plurality of CPUs and a method

摘要

An electronic device includes a first CPU, a second CPU, an auxiliary storage unit, and a controller. The auxiliary storage unit includes a first starting program for the first CPU and a second starting program for the second CPU. The first CPU loads the first starting program via the controller, and causes the controller to load the second starting program in DMA transfer. The controller, if the controller is caused by the first CPU to transfer part of the first starting program while the controller is loading the second starting program, stops loading the second starting program. When completing the transfer of the part of the first starting program, the controller restarts loading the second starting program.

主权项

1. An electronic device comprising:
a first CPU; a second CPU; an auxiliary storage unit that does not allow a plurality of accesses at the same time; and a controller that controls access to the auxiliary storage unit; the auxiliary storage unit including: a first starting program for the first CPU; and a second starting program for the second CPU; wherein the first CPU i) loads the first starting program from the auxiliary storage unit via the controller, and ii) causes the controller to load the second starting program from the auxiliary storage unit in direct memory access (DMA) transfer, and wherein the controller, i) if the controller is caused by the first CPU to transfer part of the first starting program from the auxiliary storage unit while the controller is loading the second starting program from the auxiliary storage unit in the DMA transfer, stops loading the second starting program, and ii) when completing the transfer of the part of the first starting program, restarts loading the second starting program.