U-Boot environment
From Openmoko
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== Timeouts == | == Timeouts == | ||
| − | If the | + | If the U-Boot 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: |
<pre> | <pre> | ||
setenv boot_menu_timeout [seconds] | setenv boot_menu_timeout [seconds] | ||
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=== Booting to the menu === | === Booting to the menu === | ||
| − | To stop in the NAND menu, press and hold the AUX key after pressing the power button at startup. In recent versions of | + | To stop in the NAND menu, press and hold the AUX key after pressing the power button at startup. In recent versions of U-Boot (builds from august 5 200?), you can also permanently enter the menu by setting the <tt>stop_in_menu</tt> environment variable to <tt>yes</tt>: |
setenv stop_in_menu yes | setenv stop_in_menu yes | ||
Latest revision as of 09:59, 10 February 2012
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| Bootloaders |
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The U-Boot environment configures the U-Boot. Between reboots, the environment is stored with a checksum in the internal flash partition called "u-boot_env". On the U-Boot console, there are U-Boot commands for environment manipulation.
Contents |
[edit] 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
[edit] Timeouts
If the U-Boot 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]
[edit] 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.
[edit]
To stop in the NAND menu, press and hold the AUX key after pressing the power button at startup. In recent versions of U-Boot (builds from august 5 200?), you can also permanently enter the menu by setting the stop_in_menu environment variable to yes:
setenv stop_in_menu yes saveenv
to restore normal startup, unset this variable or set it to no.
[edit] Console
To get access to the U-Boot console over USB with e.g., NeoCon, the following settings need to be made:
GTA01Bv2 # setenv stderr usbtty GTA01Bv2 # setenv stdout usbtty GTA01Bv2 # setenv stdin usbtty
