Книга: Embedded Linux Primer: A Practical, Real-World Approach

2.2.2. Starting the Target Board

2.2.2. Starting the Target Board

When power is first applied, a bootloader supplied with your target board takes immediate control of the processor. It performs some very low-level hardware initialization, including processor and memory setup, initialization of the UART controlling the serial port, and initialization of the Ethernet controller. Listing 2-1 displays the characters received from the serial port, resulting from power being applied to the target. For this example, we have chosen a target board from AMCC, the PowerPC 440EP Evaluation board nicknamed Yosemite. This is basically a reference design containing the AMCC 440EP embedded processor. It ships from AMCC with the U-Boot bootloader preinstalled.

Listing 2-1. Initial Bootloader Serial Output

U-Boot 1.1.4 (Mar 18 2006 - 20:36:11)
AMCC PowerPC 440EP Rev. B
Board: Yosemite - AMCC PPC440EP Evaluation Board
         VCO: 1066 MHz
         CPU: 533 MHz
         PLB: 133 MHz
         OPB: 66 MHz
         EPB: 66 MHz
         PCI: 66 MHz
I2C:   ready
DRAM:  256 MB
PCI:   Bus Dev VenId DevId Class Int
In:    serial
Out:   serial
Err:   serial
Net:   ppc_4xx_eth0, ppc_4xx_eth1

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