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
FLASH: 64 MB
PCI: Bus Dev VenId DevId Class Int
In: serial
Out: serial
Err: serial
Net: ppc_4xx_eth0, ppc_4xx_eth1
=>
Оглавление книги
- 4.4.4 The Dispatcher
- About the author
- Chapter 7. The state machine
- Chapter 11. Iptables targets and jumps
- Appendix E. Other resources and links
- Example NAT machine in theory
- The final stage of our NAT machine
- Compiling the user-land applications
- The conntrack entries
- Untracked connections and the raw table
- Basics of the iptables command
- ACCEPT target