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Latest revision as of 14:42, 26 June 2015

u-boot

for Linux < 2.6.26 see : u-boot before 2.6.26

u-boot is a bootloader, we've choosen it because it supports usb and network operations.

It has been adapted to support our board, especially an auto-update function, using an USB flash drive.

As any bootloader, u-boot can be used (and this is it's main purpose) to start another program (or operating system), for instance Linux. The application we want to run must be in a special form called image and can be generated using mkimage (in u-boot/tools/), for instance generating a Linux kernel image is done using the following command :

 mkimage -A ARM -T kernel -C none -O Linux -a 0x20008000 -d /opt/armebs3/linux-2.6.15/output/arch/arm/boot/zImage linux.img

After r641 of our Linux kernel, make uImage will build this image for you.

Automatic startup bootcmd

At boot, u-boot does this:

By default, it runs the command in the bootcmd variable.
If the first button (S1 on the ARMEBS3) is pressed, it tries to do AutoUpdate on the USB key. If it fails, it runs bootcmd}.
If the third button (S3 on the ARMEBS3) is pressed, it jumps to 0x10060000, after disabling instruction cache.

Settings for the technical informatics laboratories

The instruction cache must be shut-down before downloading a software via the JTAG interface.

 set bootcmd icache off
 save

Get the Linux kernel from tftp (using a static ip address), and launch it

the kernel image (uImage) is at the root of the tftp server
the tftp server IP is 153.109.5.233
the armebs3 IP is 153.109.5.232
don't forget to set the LinuxCommandLine in the bootargs variable

 set ipaddr 153.109.5.232
 set serverip 153.109.5.233
 setenv bootcmd "tftpboot 0x21000000 uImage ; bootm 0x21000000"
 save

Get the Linux kernel from tftp (using DHCP), and launch it

the kernel image (uImage) is at the root of the tftp server
the tftp server IP is 153.109.5.233
don't forget to set the LinuxCommandLine in the {{{bootargs}}} variable

 set serverip 153.109.5.233 
 setenv bootcmd "bootp 0x21000000 uImage ; bootm 0x21000000"
 save

Get the Linux kernel from flash, and launch it

The kernel image is supposed to be flashed at 0x10060000
Download the kernel to ram (using tftp for instance)
Flash it

 erase 0x10060000 +0x200000
 cp.b 0x21000000 0x10060000 0x200000

don't forget to set the LinuxCommandLine in the bootargs variable

 setenv bootcmd "bootm 0x10060000"
 save

Get the Linux kernel from an USB key, and launch it

The USB key must be FAT16 formated, without partitions
don't forget to set the LinuxCommandLine in the bootargs variable

 set bootcmd "usb start ; fatload usb 0 0x21000000 uImage ; bootm 0x21000000"

Configuration

The first time you start u-boot there are some things to configure.

Connect with a terminal emulator on the first serial port (115200,8,n,1).

Basic commands

here is a small list of usefull commands:

help : gives you help for built-in commands (without argument, display a list of all commands)
bmp : used to display a bmp on the screen (example: bmp 0x10f00000 will display the bitmap at address 0x10f00000). This command support standard bmp or gzipped bmp.
usb : used to manage usb for instance: usb start, then usb storage to see which storage has been attached.
fatload : load a file from a fat file system into memory, example : fatload usb 0 0x21000000 linux.img will load the linux kernel image at 0x21000000, don't forget to do usb start before that :-)
erase : erase flash, for instance erase 0x10060000 +0x200000 for erasing flash from 0x10060000 to 0x10260000
cp![.size] : copy from memory to memory (or to flash), for instance cp.b 0x21000000 0x10060000 0x200000 for copying 0x20000 byte from 0x21000000 (SDRAM) to 0x10060000 (flash)

u-boot works with environment variables for storing configuration options, and here are the basic commands for setting/reading variables:

setting a variable (v1)

 setenv toto hello world
 toto=hello world

printing a variable (v1)

 printenv toto
 toto=hello world

printing a variable (v2)

 echo ${toto}
 hello world

saving variables (to flash)

 save
 Saving Environment to Flash...
 Un-Protected 1 sectors
 Erasing Flash...
 . done
 Erased 1 sectors
 Writing to Flash... .
 done
 Protected 1 sectors

Well known variables

u-boot uses some known variables names for it's own use, here is an overview.

board (armebs3 specific) and protected* variable

name (type of the board), used to init board specific hardware. u-boot is compiled to support ALL ARMEBS3 based board and uses this variable to know which board it is running on. possible values are : armebs3, ipresenter, sidney, proto.

ethadd protected* variable

Ethernet address, MUST be set-up for boards using network, example : setenv ethaddr 00:00:17:00:00:00.

bootdelay

delay after reset before the bootcmp is run

bootcmd

command to run automatically after a reset, example : setenv bmp display 0x10f00000 \; bootm 0x10060000 to diplay the bitmap located at 0x10f00000 and run the software from 0x10060000. unset it (setenv bootcmd) to do nothing at boot.

bootargs ( see also [wiki:LinuxCommandLine linux command line])

boot arguments, passed to the application to be run (at least passed to linux as the kernel command line), example setenv bootargs root=1f03 ro rootfstype=romfs console=ttyS0,9600 video=s1d13x06fb:crt,mode:800x600-16

baudrate

The baudrate for the console

sdtin, stdout, stderr

Defines where the standard input, output and error stream are sent by u-boot, values can be : serial, vga (for the mezza_lcd and it's keyborard) and vga-serial (for both serial AND mezza_lcd).

video : Setup the vga output, values can be :
- video=lcd,640x480-16 for the mezza_lcd + the laboratory LCD screen.
- video=crt,800x600-16 for the mezza_lcd + vga output
- video=lcd,320x240-16 for the sidney board.

*protected variables can only be set once. To reset this variables, the flash configuration area must be erased and the system rebooted (flash protect off all ; erase 0x10040000 + 0x20000 ; boot), then the protected variables can be set again.

compiling/installing

checkout the sources from https://svn.hevs.ch/svn/uit/armebs3/u-boot/trunk

 cd /opt/armebs3
 /opt/armebs3 svn checkout https://svn.hevs.ch/svn/uit/armebs3/u-boot/trunk u-boot

compile it

 /opt/armebs3 cd u-boot
 /opt/armebs3/u-boot make armebs3_config
 /opt/armebs3/u-boot make
 /opt/armebs3/u-boot

flash it

 /opt/armebs3/u-boot cp u-boot.bin /opt/armebs3/tftp
 reset
 mm 0xfffffc20  0x0000ff01
 mm 0xffffff70  0x000030ff
 mm 0xfffffc30  0x00000001
 unlock 0x10000000 0x20000 2
 erase 0x10000000 0x20000 2
 Erasing flash at 0x10000000
 Erasing flash at 0x10020000
 Erasing flash passed
 prog 0x10000000 u-boot.bin bin
 Programming u-boot.bin , please wait ....
 Programming flash passed

u-boot, step by step, file by file

here is a small overview of what is done in which file

/u-boot/trunk/cpu/arm920t/start.S u-boot/cpu/arm920t/start.S
- reset vectors -> reset
- reset
  - do cpu init
  - call lowlevel_init from [source:/u-boot/trunk/cpu/arm920t/at91rm9200/lowlevel_init.S u-boot/cpu/arm920t/at91rm9200/lowlevel_init.S]
    - init sdram, chip select, ...
  - relocates to sdram, setup stack, clear bss section
  - jump to start_armboot (relocated)
- start_armboot from /u-boot/trunk/lib_arm/board.c u-boot/cpu/arm920t/lib_arm/board.c
  - init global data sturcture (gd)
    - call every functions from the init_sequence[] table
      - basic cpu dependent setup cpu_init u-boot/trunk/cpu/arm920t/cpu.c u-boot/cpu/arm920t/cpu.c
      - basic board dependent setup board_init u-boot/trunk/board/armebs3/armebs3.c u-boot/board/armebs3/armebs3.c
      - set up exceptions interrupt_init /u-boot/trunk/cpu/arm920t/at91rm9200/interrupts.c u-boot/cpu/arm920t/at91rm9200/interrupts.c
      - initialize environment env_init /u-boot/trunk/common/env_flash.c u-boot/common/env_flash.c
      - initialze baudrate settings init_baudrate /u-boot/trunk/lib_arm/board.c u-boot/lib_arm/board.c
      - serial communications setup serial_init /u-boot/trunk/cpu/arm920t/at91rm9200/serial.c u-boot/cpu/arm920t/at91rm9200/serial.c
      - stage 1 init of console console_init_f /u-boot/trunk/board/armebs3/armebs3.c u-boot/board/armebs3/armebs3.c
      - say that we are here display_banner /u-boot/trunk/lib_arm/board.c u-boot/lib_arm/board.c
      - configure available RAM banks dram_init (only setup how many sdram is here for u-boot, no sdram initialization) /u-boot/trunk/board/armebs3/armebs3.c u-boot/board/armebs3/armebs3.c
      - display dram info display_dram_config /u-boot/trunk/lib_arm/board.c u-boot/lib_arm/board.c
      - ...
      - run u-boot

External link(s)

here is the u-boot home page: http://u-boot.sourceforge.net/.

Hardware/ARMEBS/3/u-boot

Latest revision as of 14:42, 26 June 2015

Contents

u-boot

Automatic startup bootcmd

Settings for the technical informatics laboratories

Get the Linux kernel from tftp (using a static ip address), and launch it

Get the Linux kernel from tftp (using DHCP), and launch it

Get the Linux kernel from flash, and launch it

Get the Linux kernel from an USB key, and launch it

Configuration

Basic commands

Well known variables

compiling/installing

u-boot, step by step, file by file

External link(s)

Personal tools

Namespaces

Variants

Views

Actions

Search

Navigation

Browse

Toolbox

@@ Line 1: / Line 1: @@
-{{private}}
+{{public}}
+{{TOC right}}
 = u-boot =
-for Linux < 2.6.26 see : [wiki:u-bootBefore2.6.26 u-boot before 2.6.26] [[BR]] [[BR]]
+for Linux < 2.6.26 see : [[Hardware/ARMEBS/3/u-bootBefore2.6.26|u-boot before 2.6.26]]
-u-boot is a bootloader, we've choosen it because it supports usb and network operations. [[BR]]
-It has been adapted to support our board, especially an [wiki:AutoUpdate auto-update] function, using an USB flash drive. [[BR]]
-As any bootloader, u-boot can be used (and this is it's main purpose) to start another program (or operating system), for instance Linux. [[BR]]
-The application we want to run must be in a special form called ''image'' and can be generated using {{{mkimage}}} (in u-boot/tools/), for instance generating a Linux kernel image is done using the following command :
-{{{
-mkimage -A ARM -T kernel -C none -O Linux -a 0x20008000 -d /opt/armebs3/linux-2.6.15/output/arch/arm/boot/zImage linux.img
-}}}
-Since r641 of our Linux kernel, {{{make uImage}}} will build this image for you.
-== Automatic startup {{{bootcmd}}} ==
+u-boot is a bootloader, we've choosen it because it supports usb and network operations.
-At boot, u-boot do this:
-  * By default, it runs the command in the {{{bootcmd}}} variable.
+It has been adapted to support our board, especially an [[Hardware/ARMEBS/3/AutoUpdate|auto-update]] function, using an USB flash drive.
-  * If the first button (S1 on the ARMEBS3) is pressed, it tries to do AutoUpdate on the USB key. If it fails, it runs {{{bootcmd}}}.
-  * If the third button (S3 on the ARMEBS3) is pressed, it jumps to 0x10060000, after disabling instruction cache.
+As any bootloader, u-boot can be used (and this is it's main purpose) to start another program (or operating system), for instance Linux.
+The application we want to run must be in a special form called ''image'' and can be generated using '''mkimage''' (in u-boot/tools/), for instance generating a Linux kernel image is done using the following command :
+  mkimage -A ARM -T kernel -C none -O Linux -a 0x20008000 -d /opt/armebs3/linux-2.6.15/output/arch/arm/boot/zImage linux.img
+After r641 of our Linux kernel, '''make uImage''' will build this image for you.
+== Automatic startup ''bootcmd'' ==
+At boot, u-boot does this:
+* By default, it runs the command in the '''bootcmd''' variable.
+* If the first button (S1 on the ARMEBS3) is pressed, it tries to do AutoUpdate on the USB key. If it fails, it runs '''bootcmd}'''.
+* If the third button (S3 on the ARMEBS3) is pressed, it jumps to 0x10060000, after disabling instruction cache.
 === Settings for the technical informatics laboratories ===
 The instruction cache must be shut-down before downloading a software via the JTAG interface.
-{{{
-set bootcmd icache off
+  set bootcmd icache off
-save
+  save
-}}}
 === Get the Linux kernel from tftp (using a static ip address), and launch it ===
-  * the kernel image (uImage) is at the root of the tftp server
+* the kernel image (uImage) is at the root of the tftp server
-  * the tftp server IP is 153.109.5.233
+* the tftp server IP is 153.109.5.233
-  * the armebs3 IP is 153.109.5.232
+* the armebs3 IP is 153.109.5.232
-  * don't forget to set the LinuxCommandLine in the {{{bootargs}}} variable
+* don't forget to set the LinuxCommandLine in the '''bootargs''' variable
-{{{
-set ipaddr 153.109.5.232
+  set ipaddr 153.109.5.232
-set serverip 153.109.5.233
+  set serverip 153.109.5.233
-setenv bootcmd "tftpboot 0x21000000 uImage ; bootm 0x21000000"
+  setenv bootcmd "tftpboot 0x21000000 uImage ; bootm 0x21000000"
-save
+  save
-}}}
 === Get the Linux kernel from tftp (using DHCP), and launch it ===
-  * the kernel image (uImage) is at the root of the tftp server
+* the kernel image (uImage) is at the root of the tftp server
-  * the tftp server IP is 153.109.5.233
+* the tftp server IP is 153.109.5.233
-  * don't forget to set the LinuxCommandLine in the {{{bootargs}}} variable
+* don't forget to set the LinuxCommandLine in the {{{bootargs}}} variable
-{{{
-set serverip 153.109.5.233
+  set serverip 153.109.5.233
-setenv bootcmd "bootp 0x21000000 uImage ; bootm 0x21000000"
+  setenv bootcmd "bootp 0x21000000 uImage ; bootm 0x21000000"
-save
+  save
-}}}
 === Get the Linux kernel from flash, and launch it ===
-  * The kernel image is supposed to be flashed at 0x10060000
+* The kernel image is supposed to be flashed at 0x10060000
-    * Download the kernel to ram (using tftp for intance)
+* Download the kernel to ram (using tftp for instance)
-    * Flash it
+* Flash it
-{{{
-erase 0x10060000 +0x200000
-cp.b 0x21000000 0x10060000 0x200000
-}}}
-  * don't forget to set the LinuxCommandLine in the {{{bootargs}}} variable
-{{{
-setenv bootcmd "bootm 0x10060000"
-save
-}}}
-=== Get the Linux kernel from an USB key, and launch it ===
+   erase 0x10060000 +0x200000
-   * The USB key must be FAT16 formated, without partitions
+   cp.b 0x21000000 0x10060000 0x200000
-   * don't forget to set the LinuxCommandLine in the {{{bootargs}}} variable
-{{{
-set bootcmd "usb start ; fatload usb 0 0x21000000 uImage ; bootm 0x21000000"
-}}}
-== Configuration ==
+* don't forget to set the LinuxCommandLine in the '''bootargs''' variable
-The first time you start '''u-boot''' there is some things to configure. [[BR]]
-Connect with a terminal emulator on the first serial port (115200,8,n,1). [[BR]]
-=== Basic commands ===
+   setenv bootcmd "bootm 0x10060000"
-here is a small list of usefull commands:
+   save
-   help::
-    give you help for built-in commands (without argument, display a list of all commands)
-  bmp::
-    used to display a bmp on the screen (example: '''bmp 0x10f00000''' will display the bitmap at address 0x10f00000). This command support standard bmp or gzipped bmp, and it's possible to
-  usb::
-    used to manage usb for  instance: '''usb start''', then '''usb storage''' to see which storage has been attached
-  fatload::
-    load a file from a fat file system into memory, example : '''fatload usb 0 0x21000000 linux.img''' will load the linux kernel image at 0x21000000, don't forget to do '''usb start''' before that :-),
-  erase::
-    erase flash, for instance '''erase 0x10060000 +0x200000''' for erasing flash from 0x10060000 to 0x10260000
-   cp![.size]::
-    copy from memory to memory (or to flash), for intsance '''cp.b 0x21000000 0x10060000 0x200000''' for copying 0x20000 byte from 0x21000000 (SDRAM) to 0x10060000 (flash)
-u-boot works with environment variable for storing configuration option, and here are the basic commands for setting/reading variables:
-  * setting a variable (v1)
-{{{
-setenv toto hello world
-toto=hello world
-}}}
-  * printing a variable (v1)
+=== Get the Linux kernel from an USB key, and launch it ===
-{{{
+* The USB key must be FAT16 formated, without partitions
-printenv toto
+* don't forget to set the LinuxCommandLine in the '''bootargs''' variable
-toto=hello world
-}}}
-   * printing a variable (v2)
+   set bootcmd "usb start ; fatload usb 0 0x21000000 uImage ; bootm 0x21000000"
-{{{
-echo ${toto}
-hello world
-}}}
-  * saving variables (to flash)
-{{{
-save
-Saving Environment to Flash...
-Un-Protected 1 sectors
-Erasing Flash...
-. done
-Erased 1 sectors
-Writing to Flash... .
-done
-Protected 1 sectors
-}}}
-=== Well known variables ===
+== Configuration ==
-u-boot uses some known variables names for it's own use, here is an overview (see also [source:u-boot/trunk/README u-boot README])
+The first time you start '''u-boot''' there are some things to configure.
- board ('''armebs3''' specific) and '''protected*''' variable ::
-   name (type of the board), used to init board specific hardware. u-boot is compiled to support ALL ARMEBS3 based board and uses this variable to know which board it is running on. possible values are : '''armebs3''', '''ipresenter''', '''sidney''', '''proto'''.
- ethadd '''protected*''' variable::
+Connect with a terminal emulator on the first serial port (115200,8,n,1).
-   Ethernet address, '''MUST''' be set-up for boards using network, example : '''setenv ethaddr 00:00:17:00:00:00'''.
- bootdelay::
-   delay after reset before the bootcmp is run
- bootcmd::
+=== Basic commands ===
-   command to run automatically after a reset, example : '''setenv bmp display 0x10f00000 \; bootm 0x10060000''' to diplay the bitmap located at 0x10f00000 and run the software from 0x10060000. unset it (setenv bootcmd) to do nothing at boot.
+here is a small list of usefull commands:
+* '''help''' : gives you help for built-in commands (without argument, display a list of all commands)
+* '''bmp''' : used to display a bmp on the screen (example: '''bmp 0x10f00000''' will display the bitmap at address 0x10f00000). This command support standard bmp or gzipped bmp.
+* '''usb''' : used to manage usb for  instance: '''usb start''', then '''usb storage''' to see which storage has been attached.
+* '''fatload''' : load a file from a fat file system into memory, example : '''fatload usb 0 0x21000000 linux.img''' will load the linux kernel image at 0x21000000, don't forget to do '''usb start''' before that :-)
+* erase : erase flash, for instance '''erase 0x10060000 +0x200000''' for erasing flash from 0x10060000 to 0x10260000
+* cp![.size] : copy from memory to memory (or to flash), for instance '''cp.b 0x21000000 0x10060000 0x200000''' for copying 0x20000 byte from 0x21000000 (SDRAM) to 0x10060000 (flash)
- bootargs:: (see also [wiki:LinuxCommandLine linux command line])::
+u-boot works with environment variables for storing configuration options, and here are the basic commands for setting/reading variables:
-   boot arguments, passed to the application to be run (at least passed to linux as the kernel command line), example '''setenv bootargs root=1f03 ro rootfstype=romfs console=ttyS0,9600
+* setting a variable (v1)
- video=s1d13x06fb:crt,mode:800x600-16'''
+  setenv toto hello world
+  toto=hello world
- baudrate::
+* printing a variable (v1)
-   The baudrate for the console
+  printenv toto
+  toto=hello world
- sdtin, stdout, stderr::
+* printing a variable (v2)
-   Defines where the standard input, output and error stream are sent by u-boot, values can be : '''serial''', '''vga''' (for the mezza_lcd and it's keyborard) and '''vga-serial''' (for both serial AND mezza_lcd).
+  echo ${toto}
+  hello world
- video::
+* saving variables (to flash)
-   Setup the vga output, values can be :
+  save
-      * '''video=lcd,640x480-16''' for the mezza_lcd + the laboratory LCD screen.
+  Saving Environment to Flash...
-      * '''video=crt,800x600-16''' for the mezza_lcd + vga output
+  Un-Protected 1 sectors
-      * '''video=lcd,320x240-16''' for the sidney board.
+  Erasing Flash...
+  . done
+  Erased 1 sectors
+  Writing to Flash... .
+  done
+  Protected 1 sectors
+=== Well known variables ===
+u-boot uses some known variables names for it's own use, here is an overview.
+* board ('''armebs3''' specific) and '''protected*''' variable
+name (type of the board), used to init board specific hardware. u-boot is compiled to support ALL ARMEBS3 based board and uses this variable to know which board it is running on. possible values are : '''armebs3''', '''ipresenter''', '''sidney''', '''proto'''.
+* ethadd '''protected*''' variable
+Ethernet address, '''MUST''' be set-up for boards using network, example : '''setenv ethaddr 00:00:17:00:00:00'''.
+* bootdelay
+delay after reset before the bootcmp is run
+* bootcmd
+command to run automatically after a reset, example : '''setenv bmp display 0x10f00000 \; bootm 0x10060000''' to diplay the bitmap located at 0x10f00000 and run the software from 0x10060000. unset it (setenv bootcmd) to do nothing at boot.
+* bootargs ( see also [wiki:LinuxCommandLine linux command line])
+boot arguments, passed to the application to be run (at least passed to linux as the kernel command line), example '''setenv bootargs root=1f03 ro rootfstype=romfs console=ttyS0,9600
+video=s1d13x06fb:crt,mode:800x600-16'''
+* baudrate
+The baudrate for the console
+* sdtin, stdout, stderr
+Defines where the standard input, output and error stream are sent by u-boot, values can be : '''serial''', '''vga''' (for the mezza_lcd and it's keyborard) and '''vga-serial''' (for both serial AND mezza_lcd).
+* video : Setup the vga output, values can be :
+** '''video=lcd,640x480-16''' for the mezza_lcd + the laboratory LCD screen.
+** '''video=crt,800x600-16''' for the mezza_lcd + vga output
+** '''video=lcd,320x240-16''' for the sidney board.
 '''*protected variables''' can only be set once. To reset this variables, the flash configuration area must be erased and the system rebooted ('''flash protect off all ; erase 0x10040000 + 0x20000 ; boot'''), then the protected variables can be set again.
 == compiling/installing ==
-  * checkout the sources from !https://svn.hevs.ch/svn/uit/armebs3/u-boot/trunk ([source:u-boot/trunk view])
+* checkout the sources from https://svn.hevs.ch/svn/uit/armebs3/u-boot/trunk
-{{{
+  cd /opt/armebs3
-cd /opt/armebs3
+  /opt/armebs3 svn checkout https://svn.hevs.ch/svn/uit/armebs3/u-boot/trunk u-boot
-/opt/armebs3 snv checkout !https://svn.hevs.ch/svn/uit/armebs3/u-boot/trunk u-boot
-...
+* compile it
-/opt/armebs3
+  /opt/armebs3 cd u-boot
-}}}
+  /opt/armebs3/u-boot make armebs3_config
-  * compile it
+  /opt/armebs3/u-boot make
-{{{
+  /opt/armebs3/u-boot
-/opt/armebs3 cd u-boot
-/opt/armebs3/u-boot make armebs3_config
+* flash it
-...
+  /opt/armebs3/u-boot cp u-boot.bin /opt/armebs3/tftp
-/opt/armebs3/u-boot make
+  reset
-...
+  mm 0xfffffc20  0x0000ff01
-/opt/armebs3/u-boot
+  mm 0xffffff70  0x000030ff
-}}}
+  mm 0xfffffc30  0x00000001
-  * flash it
+  unlock 0x10000000 0x20000 2
-{{{
+  erase 0x10000000 0x20000 2
-/opt/armebs3/u-boot cp u-boot.bin /opt/armebs3/tftp
+  Erasing flash at 0x10000000
-reset
+  Erasing flash at 0x10020000
-mm 0xfffffc20  0x0000ff01
+  Erasing flash passed
-mm 0xffffff70  0x000030ff
+  prog 0x10000000 u-boot.bin bin
-mm 0xfffffc30  0x00000001
+  Programming u-boot.bin , please wait ....
-unlock 0x10000000 0x20000 2
+  Programming flash passed
-erase 0x10000000 0x20000 2
-Erasing flash at 0x10000000
-Erasing flash at 0x10020000
-Erasing flash passed
-prog 0x10000000 u-boot.bin bin
-Programming u-boot.bin , please wait ....
-Programming flash passed
-}}}
 == u-boot, step by step, file by file ==
 here is a small overview of what is done in which file
-  * [source:/u-boot/trunk/cpu/arm920t/start.S u-boot/cpu/arm920t/start.S]
+* /u-boot/trunk/cpu/arm920t/start.S u-boot/cpu/arm920t/start.S
-    * reset vectors -> reset
+** reset vectors -> reset
-    * reset
+** reset
-      * do cpu init
+*** do cpu init
-      * call lowlevel_init from [source:/u-boot/trunk/cpu/arm920t/at91rm9200/lowlevel_init.S u-boot/cpu/arm920t/at91rm9200/lowlevel_init.S]
+*** call lowlevel_init from [source:/u-boot/trunk/cpu/arm920t/at91rm9200/lowlevel_init.S u-boot/cpu/arm920t/at91rm9200/lowlevel_init.S]
-        * init sdram, chip select, ...
+**** init sdram, chip select, ...
-      * relocates to sdram, setup stack, clear bss section
+*** relocates to sdram, setup stack, clear bss section
-      * jump to start_armboot (relocated)
+*** jump to start_armboot (relocated)
-    * start_armboot from [source:/u-boot/trunk/lib_arm/board.c u-boot/cpu/arm920t/lib_arm/board.c]
+** start_armboot from /u-boot/trunk/lib_arm/board.c u-boot/cpu/arm920t/lib_arm/board.c
-      * init global data sturcture (gd)
+*** init global data sturcture (gd)
-      * call every functions from the init_sequence[] table
+**** call every functions from the init_sequence[] table
-        * basic cpu dependent setup     cpu_init [source:/u-boot/trunk/cpu/arm920t/cpu.c u-boot/cpu/arm920t/cpu.c]
+***** basic cpu dependent setup     cpu_init u-boot/trunk/cpu/arm920t/cpu.c u-boot/cpu/arm920t/cpu.c
-        * basic board dependent setup   board_init [source:/u-boot/trunk/board/armebs3/armebs3.c u-boot/board/armebs3/armebs3.c]
+***** basic board dependent setup   board_init u-boot/trunk/board/armebs3/armebs3.c u-boot/board/armebs3/armebs3.c
-        * set up exceptions             interrupt_init [source:/u-boot/trunk/cpu/arm920t/at91rm9200/interrupts.c u-boot/cpu/arm920t/at91rm9200/interrupts.c]
+***** set up exceptions             interrupt_init /u-boot/trunk/cpu/arm920t/at91rm9200/interrupts.c u-boot/cpu/arm920t/at91rm9200/interrupts.c
-        * initialize environment        env_init [source:/u-boot/trunk/common/env_flash.c u-boot/common/env_flash.c]
+***** initialize environment        env_init /u-boot/trunk/common/env_flash.c u-boot/common/env_flash.c
-        * initialze baudrate settings   init_baudrate [source:/u-boot/trunk/lib_arm/board.c u-boot/lib_arm/board.c]
+***** initialze baudrate settings   init_baudrate /u-boot/trunk/lib_arm/board.c u-boot/lib_arm/board.c
-        * serial communications setup   serial_init [source:/u-boot/trunk/cpu/arm920t/at91rm9200/serial.c u-boot/cpu/arm920t/at91rm9200/serial.c]
+***** serial communications setup   serial_init /u-boot/trunk/cpu/arm920t/at91rm9200/serial.c u-boot/cpu/arm920t/at91rm9200/serial.c
-        * stage 1 init of console       console_init_f [source:/u-boot/trunk/board/armebs3/armebs3.c u-boot/board/armebs3/armebs3.c]
+***** stage 1 init of console       console_init_f /u-boot/trunk/board/armebs3/armebs3.c u-boot/board/armebs3/armebs3.c
-        * say that we are here          display_banner [source:/u-boot/trunk/lib_arm/board.c u-boot/lib_arm/board.c]
+***** say that we are here          display_banner /u-boot/trunk/lib_arm/board.c u-boot/lib_arm/board.c
-        * configure available RAM banks dram_init (only setup how many sdram is here for u-boot, no sdram initialization) [source:/u-boot/trunk/board/armebs3/armebs3.c u-boot/board/armebs3/armebs3.c]
+***** configure available RAM banks dram_init (only setup how many sdram is here for u-boot, no sdram initialization) /u-boot/trunk/board/armebs3/armebs3.c u-boot/board/armebs3/armebs3.c
-        * display dram info             display_dram_config [source:/u-boot/trunk/lib_arm/board.c u-boot/lib_arm/board.c]
+***** display dram info             display_dram_config /u-boot/trunk/lib_arm/board.c u-boot/lib_arm/board.c
-      * ...
+***** ...
-      * run u-boot
+***** run u-boot
 == External link(s) ==
- here is the u-boot home page: [http://u-boot.sourceforge.net/ http://u-boot.sourceforge.net/].
+here is the u-boot home page: [http://u-boot.sourceforge.net/ http://u-boot.sourceforge.net/].
+[[Category:Hardware]] [[Category:ARMEBS]]