Passing bootarg init=/bin/bash to U-boot

Technical Support
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1

Hi,

I’m trying to recover lost credentials on Colibri IMX6 V1.0A running on Colibri_iMX6_LinuxImageV2.6_20160630.

I’ve connected my dev laptop to the J13 header and established connection to the bootloader using terminal. However, if i try:

setenv bootargs init=/bin/bash it has no effect on the boot.

The default env is the following:

arch=arm
baudrate=115200
board=colibri_imx6
board_name=colibri_imx6
board_rev=010a
boot_file=uImage
bootcmd=run emmcboot ; echo ; echo emmcboot failed ; run nfsboot ; echo ; echo nfsboot failed ; usb start ;setenv stdout serial,vga ; setenv stdin serial,usbkbd
bootdelay=5
console=ttymxc0
cpu=armv7
defargs=enable_wait_mode=off galcore.contiguousSize=50331648
dfu_alt_info=u-boot.imx raw 0x2 0x3ff mmcpart 0;boot part 0 1;rootfs part 0 2;uImage fat 0 1;imx6q-colibri-eval-v3.dtb fat 0 1;imx6q-colibri-cam-eval-v3.dtb fat 0 1
emmcargs=ip=off root=/dev/mmcblk0p2 rw,noatime rootfstype=ext3 rootwait
emmcboot=run setup; setenv bootargs ${defargs} ${emmcargs} ${setupargs} ${vidargs}; echo Booting from internal eMMC chip...; run emmcdtbload; load mmc 0:1 ${kernel_addr_r} ${boot_file} && bootm ${kernel_addr_r} ${dtbparam}
emmcdtbload=setenv dtbparam; load mmc 0:1 ${fdt_addr_r} ${fdt_file} && setenv dtbparam " - ${fdt_addr_r}" && true
ethact=FEC
ethaddr=00:14:2d:4b:1b:f3
ethprime=FEC
fdt_addr_r=0x12000000
fdt_file=imx6dl-colibri-eval-v3.dtb
ipaddr=192.168.10.2
kernel_addr_r=0x10800000
loadaddr=0x12000000
netmask=255.255.255.0
nfsargs=ip=:::::eth0:on root=/dev/nfs rw netdevwait
nfsboot=run setup; setenv bootargs ${defargs} ${nfsargs} ${setupargs} ${vidargs}; echo Booting via DHCP/TFTP/NFS...; run nfsdtbload; dhcp ${kernel_addr_r} && bootm ${kernel_addr_r} ${dtbparam}
nfsdtbload=setenv dtbparam; tftp ${fdt_addr_r} ${fdt_file} && setenv dtbparam " - ${fdt_addr_r}" && true
ramdisk_addr_r=0x12100000
sdargs=ip=off root=/dev/mmcblk1p2 rw,noatime rootfstype=ext3 rootwait
sdboot=run setup; setenv bootargs ${defargs} ${sdargs} ${setupargs} ${vidargs}; echo Booting from SD card in 8bit slot...; run sddtbload; load mmc 1:1 ${kernel_addr_r} ${boot_file} && bootm ${kernel_addr_r} ${dtbparam}
sddtbload=setenv dtbparam; load mmc 1:1 ${fdt_addr_r} ${fdt_file} && setenv dtbparam " - ${fdt_addr_r}" && true
serial#=04922355
serverip=192.168.10.1
setethupdate=tftpboot ${kernel_addr_r} flash_eth.img
setsdupdate=setenv interface mmc; setenv drive 1; mmc rescan; load ${interface} ${drive}:1 ${kernel_addr_r} flash_blk.img
setup=setenv setupargs fec_mac=${ethaddr} consoleblank=0  no_console_suspend=1 console=tty1 console=${console},${baudrate}n8
setupdate=run setsdupdate || run setusbupdate || run setethupdate; source ${kernel_addr_r}
setusbupdate=usb start && setenv interface usb; setenv drive 0; load ${interface} ${drive}:1 ${kernel_addr_r} flash_blk.img
soc=mx6
splashpos=m,m
vendor=toradex
ver=U-Boot 2015.04 (May 18 2015 - 14:17:54)
vidargs=video=mxcfb0:dev=lcd,640x480M@60,if=RGB666 video=mxcfb1:off fbmem=8M

Environment size: 2705/8188 bytes

Thanks
-Carl

2

I managed to get it solved. I needed to modify the emmcboot env to following:

emmcboot=run setup; setenv bootargs ${defargs} ${emmcargs} ${setupargs} ${vidargs} bootargs init=/bin/bash; echo Booting from internal eMMC chip...; run emmcdtbload; load mmc 0:1 ${kernel_addr_r} ${boot_file} && bootm ${kernel_addr_r} ${dtbparam}

adding the bootargs init=/bin/bash to the last argument of the setenv commad, before the first ;

This allowed me to boot straight into root shell and using passwd root switch the root password.

3

Perfect that you found a solution. Thanks for the feedback.