Professional Embedded ARM Development by James A. Langbridge

Author:James A. Langbridge
Language: eng
Format: epub, pdf
Publisher: John Wiley & Sons
Published: 2013-11-25T16:00:00+00:00

Boot Procedure

The Raspberry Pi has an interesting boot procedure. On power on, the ARM core is held in a reset state, while the GPU takes control of the system. The GPU has some internal firmware that is responsible for the first boot steps, including reading from the first partition of the SD card. For the Raspberry Pi to boot, the first partition must be formatted to FAT32 and must contain several files.

bootcode.bin

This is the first file to be loaded from the SD card by the GPU. It is loaded into the L2 cache, and its role is to enable the SDRAM memory and to configure a few system settings. It then loads the next bootloader stage.

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