If you're using the VMware ® version of this appliance, and you have VMware Workstation, you can add more disk space as follows:

1. Take a snapshot of your existing VM as a safety precaution.
2. Shutdown the VM cleanly.

   Either use rPath Appliance Agent Web UI or login as root and issue:

   shutdown -h now

3. Add the new virtual disk in Workstation's VM -> Settings menu.

   Choose SCSI for the virtual hardware.

   If the existing virtual drive is SCSI, use /dev/sdb in all instructions below. If the existing drive is IDE use /dev/sda. SCSI drives are mapped to /dev/ device entries in order, starting with /dev/sda then /dev/sdb /dev/sdc, etc.

   Make it growable to whatever maximum you desire.

4. Startup the VM.
5. Login as root
6. Create a partition table on the new disk using fdisk. This is an interactive tool, so you're going to need to answer a few questions.

   fdisk /dev/sdb 
   

   • choose n for "new partition"
   • choose p for "primary"
   • type 1 for the partition number
   • accept the default start and end options (hit Enter twice)
   • choose w to "write the partition table"
7. Make a filesystem on the new partition

   mkfs.ext3 /dev/sdb1

8. Mount the filesystem on a temporary location

   mount /dev/sdb1 /mnt

9. Copy all the /srv contents to the new partition

   cp -rp /srv/* /mnt

10. Move the old contents out of the way

    mkdir /srv.old; mv /srv/* /srv.old

11. Add a line to /etc/fstab to cause your new partition to be mounted at boot

    Either use echo to append a line, or use vi to edit if you're comfortable with vi

    echo '/dev/sdb1 /srv  ext3  defaults  1 1' >> /etc/fstab

12. Reboot

shutdown -r now

After rebooting, you can confirm that your disk setup now has the new disk on the /srv directory mount point by typing on the command line:

df -h

You should see something like

  Filesystem   Size   Used  Avail Use%  Mounted on
  /dev/sda1    512M   256M  256M   50%  /
  none         126M      0  126M    0%  /dev/shm
  /dev/sdb1    7.9G    73M  7.5G    1%  /srv

After confirming that the contents have all been copied correctly, you can remove the backup data:

rm -rf /srv.old

U-boot是基于PowerPC, ARM, MIPS等多种处理器上的bootloader，可以安装在boot ROM中，用于初始化或者测试硬件，或者用于装载和运行应用程序。

 where we come from

Names and Spelling:

 

文件名以u-boot为开头，例如

#include <asm/u-boot.h>

#include <asm-ppc/u-boot.h>

变量名，预编译常数等都以u_boot或者U_BOOT开头，例如

U_BOOT_VERSION    u_boot_logo

IH_OS_U_BOOT       u_boot_hush_start

 Versioning:

 

U-Boot版本信息由version, sub-version和patchlevel组成。例如”U-Boot-2.34.5”表示version “2”, sub-version “34”, 和patchlevel “4”.对于正式的发布版本来说，patchlevel总为“0”.

 

Directory Hierarchy:

 

- board        Board dependent files

- common      Misc architecture independent functions

- cpu          CPU specific files

- 74xx_7xx   Files specific to Freescale MPC74xx and 7xx CPUs

- arm720t    Files specific to ARM 720 CPUs

- arm920t    Files specific to ARM 920 CPUs

     - at91rm9200 Files specific to Atmel AT91RM9200 CPU

     - imx         Files specific to Freescale MC9328 i.MX CPUs

     - s3c24x0      Files specific to Samsung S3C24X0 CPUs

 - arm925t    Files specific to ARM 925 CPUs

 - arm926ejs Files specific to ARM 926 CPUs

 - arm1136   Files specific to ARM 1136 CPUs

           - i386      Files specific to i386 CPUs

- ixp        Files specific to Intel Xscale IXP CPUs

- mcf52x2    Files specific to Freescale ColdFire MCF52x2 CPUs

- mips       Files specific to MIPS CPUs

- mpc5xx    Files specific to Freescale MPC5xx CPUs

- mpc5xxx   Files specific to Freescale MPC5xxx CPUs

          - mpc8xx    Files specific to Freescale MPC8xx CPUs

           - mpc8220   Files specific to Freescale MPC8220 CPUs

           - mpc824x   Files specific to Freescale MPC824x CPUs

           - mpc8260   Files specific to Freescale MPC8260 CPUs

           - nios       Files specific to Altera NIOS CPUs

- nios2     Files specific to Altera Nios-II CPUs

- ppc4xx    Files specific to AMCC PowerPC 4xx CPUs

- pxa       Files specific to Intel Xscale PXA CPUs

- s3c4bb0   Files specific to Samsung S3C44B0 CPUs

- sa1100    Files specific to Intel StrongARM SA1100 CPUs

- disk    Code for disk drive partition handling

- doc     Documentation

-         drivers Commonly used device drivers

-         dtt      Digital Thermometer and Thermostat drivers

-         examples Example code for standalone applications, etc

-         include Header Files

-         lib_arm File generic to ARM   architecture

-         lib_generic File generic to all   architecture

-         lib_i386 File generic to i386   architecture

- lib_m68k File generic to m68k   architecture

- lib_mips   File generic to MIPS   architecture

- lib_nios    File generic to NIOS   architecture

- lib_ppc    File generic to PowerPC architecture

- net        Networking code

- post       Power On Self Test

- rtc        Real Time Clock drivers

-  tools      Tools to build S-Record or U-Boot images, etc

 

 

Software Configuration:

 

Configuration _OPTIONS_:

由用户指定，以CONFIG_开头

Configuration_SETTINGS_:

跟具体硬件相关，以CFG_

 

 

 

对于已经支持的board，已有默认的configuration,故需要直接make即可，make

<board_name>_config.

Example:

cd u-boot

make TQM82L_config

对于Cogent platform，则需要make cogent_mpc8xx_config.

Configuration Options:

Configuration取决于board和CPU类型，其信息在include/configs/<board_name>.h

中，例如include/configs/TQM823L.h

需要指定如下：

- CPU Types: 例如CONFIG_MPC860

- Board Type: 例如 CONFIG_PCIPPC2

-         CPU Module Type:(如果定义了CONFIG_COGENT),例如CONFIG_CMA286_60_OLD

-         Motherboard Type:(如果定义了CONFIG_COGENT)例如CONFIG_CMA101

-         Motherboard I/O Modules: (如果定义了CONFIG_COGENT),例如CONGIG_

CMA302

-         Board flavour

-         MPC824x Family Member

-         8xx CPU options

-         859/866/865 CPU options

-         Linux Kernel Interface:

-         Serial Ports

-         Console Interface

-         Console Baudrate

-         Interrupt driven serial port input

-         Console UART Number

-         Boot Delay

-         Autoboot Command

-         Pre-Boot Commands

-         Serial Download Echo Mode

-         Kgdb Serial Baudrate

-         Monitor Functions

-         Watchdog

-         U-Boot Version

-         Real-Time Clock

-         Timestamp Support

-         Partition Support

-         IDE Reset method

-         ATAPI support

-         LBA48 support

-         SCSI support

-         NETWORK support(PCI and others)

-         USB support

-         MMC support

-         Journaling Flash filesystem support

-         Keyboard support

-         Video support

-         Keyboard support

-         LCD support

-         Splash Screen Support

-         Gzip compressed BMP image support

-         Compression support

-         MII/PHY support

-         Ethernet address

-         IP address

-         Server IP address

-         Boot Recovery mode

-         DHCP Advanded options

-         CDP options

-         Status LED

-         CAN support

-         I2C support

-         SPI support

-         FPGA support

-         Configuration management

-         Vendor Parameter protection

-         Protected RAM

-         Error Recovery

-         Command Interpreter

-         Default Environment

-         DataFlash Support

-         SystemACE Support

-         TFTP Fixed UDP Port

-         Show boot progress

Modem Support:

       

-         Modem support enable: CONFIG_MODEM_SUPPORT

-         RTS/CTS Flow control enable: CONFIG_HWFLOW

-         Modem debug support

-         Interrupt support(PPC): interrupt_init()和timer_interrupt()对于所有PPC结构来说都是通用的。其中，interrupt_init()调用interrupt_init_cpu()对特定CPU进行初始化。在interrupt_init_cpu()中，应设定合适的decrement_count值。timer_interrupt()调用timer_interrupt_cpu()处理特定的CPU定时。如果板上有watchdog/status_led等，在timer_interrupt()后有效。

-         General

Configuration Settings:

Low Level (hardware related) configuration options:

 

Buildin the Software:

 

U-BOOT已经在native PPC环境和交叉环境中测试过，包括在LinuxPPC 2000, RedHat  Linux on x86, Solaries 2.6 on SPARC及NetBSD 1.5 on x86。如 果不是使用native PPC environment，那么则需要具有交叉编译工具如前缀“powerpc-linux-”等编译器，链接器，elf文件分析器等工具。这是需要重新定 义Makefile中的CROSS_COMPILE。例如：CROSS_COMPILE = ppc_4xx-，此外，还需要制定U-Boot为特定的board type。

              make NAME_CONFIG

最后，运行

             make all

来生成U-Boot images。生成的image包括：

           u-boot.bin      是raw binary image

           u-boot            是ELF格式的image

           u-boot.srec   是Motorola(FreeScale)的s-records format

此外，还需要注意，与GNU mkae不同，在NetBSD下应该使用"gmake"

 U-Boot的移植

     如果使用的platform不存在，则需要将U-BOOT进行移植。步骤如下：   

（1）    为使用的board为Makefile和MAKEALL添加新的configuration option。
（2）    为使用的board新建一个新的目录，该目录下至少应该包含“Makefile”
                      “<board>.c”和“flash.c”及“u-boot.lds”
（3）    运行“make <board>_config”
（4）    运行“make”，则会生成“u-boot.srec” image
（5）    Debug and test

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