Intro:
U-Boot shenanigans. While playing around with VxWorks images I figured I better have a copy of this in case something goes wrong. Little did I know at the time that the OS image would reset all the variables back to normal after the first boot. I kept the post in case someone wants the default output or help command output as a reference.
*The serial connection on the Orange PI Zero 3 (MicroSD port at top) from left to right is GND, RX, TX.
*If you default the boot variables or you screw something up, insert a MicroSD card with "Orangepizero3_1.0.2_debian_bookworm_server_linux6.1.31" burned to it and boot it. This should set the env variables again.
Here's the output of the "env" command:
=> env
env - environment handling commands
Usage:
env default [-f] -a - [forcibly] reset default environment
env default [-f] var [...] - [forcibly] reset variable(s) to their default values
env delete [-f] var [...] - [forcibly] delete variable(s)
env edit name - edit environment variable
env exists name - tests for existence of variable
env export [-t | -b | -c] [-s size] addr [var ...] - export environment
env import [-d] [-t [-r] | -b | -c] addr [size] [var ...] - import environment
env print [-a | name ...] - print environment
env run var [...] - run commands in an environment variable
env save - save environment
env set [-f] name [arg ...]
=>
How to Default the Boot Environment Variables:
- Pull the MicroSD card from the PI.
- Type "reset".
- Hit the space bar to interrupt boot.
- Type "env default -a".
- Type "reset".
- Hit the space bar to interrupt boot.
- Type "printenv" and it should look like the following:
=> printenv
baudrate=115200
bootcmd=run distro_bootcmd
bootdelay=2
Environment size: 62/131068 bytes
=>
After booting "Orangepizero3_1.0.2_debian_bookworm_server_linux6.1.31":
boot_fastboot=fastboot
boot_normal=sunxi_flash read 45000000 boot;bootm 45000000
boot_recovery=sunxi_flash read 45000000 recovery;bootm 45000000
bootcmd=run setargs_nor boot_normal
bootdelay=2
bootreason=unknow
cma=64M
console=tty1
earlyprintk=sunxi-uart,0x05000000
fastboot_key_value_max=0x8
fastboot_key_value_min=0x2
fdtcontroladdr=bbf1aba0
init=/init
initcall_debug=0
keybox_list=hdcpkey,widevine
loglevel=2
mmc_root=/dev/mmcblk0p4
nand_root=/dev/nand0p4
nor_root=/dev/mtdblock4
partitions=boot-resource@mtdblock1:env@mtdblock2:boot@mtdblock3:rootfs@mtdblock4:UDISK@mtdblock5
recovery_key_value_max=0x13
recovery_key_value_min=0x10
selinux=0
setargs_mmc=setenv bootargs earlyprintk=${earlyprintk} initcall_debug=${initcall_debug} console=${console} loglevel=${loglevel} root=${mmc_root} rootwait init=${init} partitions=${partitions} cma=${cma} snum=${snum} mac_addr=${mac} wifi_mac=${wifi_mac} bt_mac=${bt_mac} selinux=${selinux} specialstr=${specialstr} gpt=1
setargs_nand=setenv bootargs earlyprintk=${earlyprintk} initcall_debug=${initcall_debug} console=${console} loglevel=${loglevel} root=${nand_root} init=${init} partitions=${partitions} cma=${cma} snum=${snum} mac_addr=${mac} wifi_mac=${wifi_mac} bt_mac=${bt_mac} selinux=${selinux} specialstr=${specialstr} gpt=1
setargs_nor=setenv bootargs earlyprintk=${earlyprintk} initcall_debug=${initcall_debug} console=${console} loglevel=${loglevel} root=${nor_root} init=${init} partitions=${partitions} cma=${cma} snum=${snum} mac_addr=${mac} wifi_mac=${wifi_mac} bt_mac=${bt_mac} selinux=${selinux} specialstr=${specialstr} gpt=1
snum=REMOVED (19 characters)U-Boot Help Menu:
? - alias for 'help'
base - print or set address offset
bdinfo - print Board Info structure
boot - boot default, i.e., run 'bootcmd'
bootd - boot default, i.e., run 'bootcmd'
bootm - boot application image from memory
bootp - boot image via network using BOOTP/TFTP protocol
cmp - memory compare
coninfo - print console devices and information
cp - memory copy
crc32 - checksum calculation
echo - echo args to console
editenv - edit environment variable
efex - run to efex
env - environment handling commands
erase - erase FLASH memory
fastboot - fastboot - enter USB Fastboot protocol
fatinfo - print information about filesystem
fatload - load binary file from a dos filesystem
fatls - list files in a directory (default /)
fatsize - determine a file's size
fatwrite - write file into a dos filesystem
fdt - flattened device tree utility commands
flinfo - print FLASH memory information
go - start application at address 'addr'
gpt - GUID Partition Table
help - print command description/usage
i2c - I2C sub-system
itest - return true/false on integer compare
loadb - load binary file over serial line (kermit mode)
loads - load S-Record file over serial line
loadx - load binary file over serial line (xmodem mode)
loady - load binary file over serial line (ymodem mode)
loop - infinite loop on address range
md - memory display
memtester - start application at address 'addr'
mm - memory modify (auto-incrementing address)
mmc - MMC sub system
mmcinfo - display MMC info
mw - memory write (fill)
nfs - boot image via network using NFS protocol
nm - memory modify (constant address)
pbread - read data from private data
poweroff - Perform POWEROFF of the device
printenv - print environment variables
protect - enable or disable FLASH write protection
pst - read data from secure storageerase flag in secure storage
reset - Perform RESET of the CPU
run - run commands in an environment variable
saveenv - save environment variables to persistent storage
setenv - set environment variables
setexpr - set environment variable as the result of eval expression
sleep - delay execution for some time
source - run script from memory
sprite_test - do a sprite test
sunxi_axp - sunxi_axp sub-system
sunxi_card0_probe - probe sunxi card0 device
sunxi_flash - sunxi_flash sub-system
sunxi_so - sunxi_so sub-system
tftpboot - boot image via network using TFTP protocol
timer_test - do a timer and int test
timer_test1 - do a timer and int test
uburn - do a burn from boot
version - print monitor, compiler and linker version👽
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