U-Boot environment

From Openmoko

(Difference between revisions)
Jump to: navigation, search
(catchg)
Line 54: Line 54:
 
</pre>
 
</pre>
 
{{Languages|Bootloader}}
 
{{Languages|Bootloader}}
[[Category:Software]]
+
 
 +
[[Category:Software (non openmoko)]]
 
[[Category:Kernel]]
 
[[Category:Kernel]]
 
[[Category:Guides]]
 
[[Category:Guides]]

Revision as of 12:21, 6 July 2008

Bootloaders

The bootloader environment configures the bootloader. Between reboots, the environment is stored with a checksum in the internal flash partition called "u-boot_env". On the bootloader console, there are bootloader commands for environment manipulation.

Contents

Typical environment

baudrate=115200
bootargs=rootfstype=jffs2 root=/dev/mtdblock4 console=ttySAC0,115200 console=tty0 loglevel=8 dyntick=enable lpj=252416
usbtty=cdc_acm
bootdelay=10
stdout=serial
stderr=serial
stdin=serial
mtdparts=mtdparts=neo1973-nand:0x00030000(u-boot),0x0000c000(u-boot_env),0x00200000(kernel),0x00130000(splash),0x03c94000(rootfs)
mtdids=nand0=neo1973-nand
bootargs_base=rootfstype=jffs2 root=/dev/mtdblock4 console=ttySAC0,115200 console=tty0 loglevel=8 dyntick=enable lpj=252416
bootcmd=setenv bootargs ${bootargs_base} ${mtdparts}; nand read.e 0x32000000 kernel; bootm 0x32000000
pcf50606_int1=0x40
filesize=160C000
partition=nand0,0
mtddevnum=0
mtddevname=u-boot

Timeouts

If the boot loader menu is on the screen, the phone will power off when there hasn't been activity for a while. This is not nice if you are working on the boot loader console, but you can make the time longer:

setenv boot_menu_timeout [seconds]

After the phone is powered on, there is a short period of time when you can connect to the console and cancel the automatic boot without going to the menu:

setenv bootdelay [seconds]

Menu

You can add items to the boot menu by setting environment variables of the form menu_<number> to values of the form <Title>: U-Boot-Commands.

For example the following command will add a boot menu entry that switches to autofast charging and turns off the backlight:

 setenv menu_6 Autofast-Charge and Backlight Off: neo1973 charger autofast\; neo1973 backlight off

While in this state, your Neo1973 can be charged with a generic USB charger. You also need to set boot_menu_timeout to 65000 to keep it from powering down, though.

Console

To get access to the bootloader console over USB, the following settings need to be made:

GTA01Bv2 # setenv stderr usbtty
GTA01Bv2 # setenv stdout usbtty
GTA01Bv2 # setenv stdin usbtty
Personal tools
Bootloaders

The bootloader environment configures the bootloader. Between reboots, the environment is stored with a checksum in the internal flash partition called "u-boot_env". On the bootloader console, there are bootloader commands for environment manipulation.

Typical environment

baudrate=115200
bootargs=rootfstype=jffs2 root=/dev/mtdblock4 console=ttySAC0,115200 console=tty0 loglevel=8 dyntick=enable lpj=252416
usbtty=cdc_acm
bootdelay=10
stdout=serial
stderr=serial
stdin=serial
mtdparts=mtdparts=neo1973-nand:0x00030000(u-boot),0x0000c000(u-boot_env),0x00200000(kernel),0x00130000(splash),0x03c94000(rootfs)
mtdids=nand0=neo1973-nand
bootargs_base=rootfstype=jffs2 root=/dev/mtdblock4 console=ttySAC0,115200 console=tty0 loglevel=8 dyntick=enable lpj=252416
bootcmd=setenv bootargs ${bootargs_base} ${mtdparts}; nand read.e 0x32000000 kernel; bootm 0x32000000
pcf50606_int1=0x40
filesize=160C000
partition=nand0,0
mtddevnum=0
mtddevname=u-boot

Timeouts

If the boot loader menu is on the screen, the phone will power off when there hasn't been activity for a while. This is not nice if you are working on the boot loader console, but you can make the time longer:

setenv boot_menu_timeout [seconds]

After the phone is powered on, there is a short period of time when you can connect to the console and cancel the automatic boot without going to the menu:

setenv bootdelay [seconds]

Menu

You can add items to the boot menu by setting environment variables of the form menu_<number> to values of the form <Title>: U-Boot-Commands.

For example the following command will add a boot menu entry that switches to autofast charging and turns off the backlight:

 setenv menu_6 Autofast-Charge and Backlight Off: neo1973 charger autofast\; neo1973 backlight off

While in this state, your Neo1973 can be charged with a generic USB charger. You also need to set boot_menu_timeout to 65000 to keep it from powering down, though.

Console

To get access to the bootloader console over USB, the following settings need to be made:

GTA01Bv2 # setenv stderr usbtty
GTA01Bv2 # setenv stdout usbtty
GTA01Bv2 # setenv stdin usbtty